METROMEDIA FIBER NETWORK INC
424B5, 1999-11-15
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>
                                             As filed pursuant to Rule 424(b)(5)
                                                      Registration No. 333-89087

PROSPECTUS SUPPLEMENT

(TO PROSPECTUS DATED OCTOBER 28, 1999)

                                     [LOGO]

                                 $1,010,900,000

                         METROMEDIA FIBER NETWORK, INC.

                     $750,000,000 10% SENIOR NOTES DUE 2009
                  [EURO]250,000,000 10% SENIOR NOTES DUE 2009
                                   ---------

    The Dollar notes will accrue interest from the date of their issuance at the
rate of 10% per year and the Euro notes will accrue interest from the date of
their issuance at the rate of 10% per year, in each case payable semi-annually
in arrears on each June 15 and December 15 of each year, commencing on June 15,
2000.

    The notes will be unsecured, will rank equal in right of payment with all
our other existing and future senior unsecured indebtedness and will be
effectively subordinated to all our existing and future secured indebtedness to
the extent of the assets that secure that indebtedness and to all of our
subsidiaries' existing or future indebtedness, whether or not secured.

    The notes will be redeemable, in whole or in part, at our option, at any
time on or after December 15, 2004 at the redemption prices described in this
prospectus supplement, plus accrued and unpaid interest to the date of
redemption.

    Application has been made to list the notes on the Luxembourg Stock
Exchange.
                                 --------------

    INVESTING IN THE NOTES INVOLVES CERTAIN RISKS. SEE "RISK FACTORS" BEGINNING
ON PAGE S-13 OF THIS PROSPECTUS SUPPLEMENT AND PAGE 3 OF THE ACCOMPANYING
PROSPECTUS.

    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus supplement or the accompanying prospectus is truthful or complete.
Any representation to the contrary is a criminal offense.
                                 --------------

<TABLE>
<CAPTION>
                                        PER          TOTAL          PER         TOTAL          COMBINED
                                    DOLLAR NOTE   DOLLAR NOTES   EURO NOTE    EURO NOTES       TOTAL(1)
                                    -----------   ------------   ---------   ------------   --------------
<S>                                 <C>           <C>            <C>         <C>            <C>
Public Offering Price                 99.201%     $744,007,500    99.201%    [EURO]248,002,500 $1,002,822,909
Underwriting Discount                  2.625%     $ 19,687,500     2.625%    [EURO]  6,562,500 $   26,536,125
Proceeds to Us (before expenses)      96.576%     $724,320,000    96.576%    [EURO]241,440,000 $  976,286,784
</TABLE>

- ------------------------

(1) Based on the conversion rate of $1.0436=[EURO]1.00, which is the noon buying
    rate as of November 10, 1999 in New York City for cable transfers in foreign
    currencies, as certified for customs purposes by the Federal Reserve Bank of
    New York.
                                 --------------

    The underwriters are offering the notes subject to various conditions. The
underwriters expect to deliver the notes to purchasers on or about November 17,
1999, the issue date of the notes.

                                 --------------

SALOMON SMITH BARNEY
     CHASE SECURITIES INC.
           DEUTSCHE BANC ALEX. BROWN
                 DONALDSON, LUFKIN & JENRETTE
                       GOLDMAN, SACHS & CO.
<PAGE>
                             MORGAN STANLEY DEAN WITTER

November 12, 1999
<PAGE>
    YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS. WE HAVE
NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH DIFFERENT INFORMATION. WE ARE NOT
MAKING AN OFFER OF THESE SECURITIES IN ANY STATE WHERE THE OFFER IS NOT
PERMITTED. YOU SHOULD NOT ASSUME THAT THE INFORMATION PROVIDED BY THIS
PROSPECTUS SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS IS ACCURATE AS OF ANY DATE
OTHER THAN THE DATE ON THE FRONT OF THIS PROSPECTUS SUPPLEMENT.

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
                        PROSPECTUS SUPPLEMENT
About this Prospectus Supplement............................     S-3
Summary.....................................................     S-4
Risk Factors................................................    S-13
Special Note Regarding Forward-Looking Statements...........    S-24
Use of Proceeds.............................................    S-26
Capitalization..............................................    S-27
Selected Consolidated Financial Data........................    S-28
Unaudited Pro Forma Condensed Combining Financial
  Information...............................................    S-30
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................    S-34
Business....................................................    S-42
Management..................................................    S-61
Certain Relationships and Related Transactions..............    S-70
Security Ownership..........................................    S-72
Description of Other Indebtedness...........................    S-74
Recent and Proposed Transactions............................    S-75
Description of the Notes....................................    S-77
Certain United States Federal Income Tax Considerations.....   S-110
Underwriting................................................   S-115
Notice to Canadian Residents................................   S-117
Validity of the Notes.......................................   S-120
Experts.....................................................   S-120
Where You Can Find More Information.........................   S-120
Incorporation of Information We File with the SEC...........   S-121
General Information.........................................   S-122
Index to Consolidated Financial Statements..................     F-1
</TABLE>

                                   PROSPECTUS

<TABLE>
<S>                                                           <C>
Risk Factors................................................      3
Special Note Regarding Forward-Looking Statements...........     10
About This Prospectus.......................................     11
Business....................................................     11
Ratio of Earnings to Fixed Charges and Preferred Stock
  Dividends.................................................     12
Use of Proceeds.............................................     12
Description of Debt Securities..............................     13
Description of Capital Stock................................     22
Description of Warrants.....................................     28
Selling Stockholders........................................     29
Plan of Distribution........................................     29
Validity of Securities......................................     30
Experts.....................................................     30
Where You Can Find More Information.........................     31
Incorporation of Information We File with the SEC...........     31
</TABLE>

                                      S-2
<PAGE>
                            ------------------------

    Certain persons participating in this offering may engage in transactions
that stabilize, maintain or otherwise affect the price of the notes, including
overallotment, stabilizing and short-covering transactions in the notes, and the
imposition of a penalty bid, during and after the offering of the notes. Such
stabilization, if commenced, may be discontinued at any time. For a description
of these activities, please refer to the section in this prospectus supplement
entitled "Underwriting."

                            ------------------------

    We accept responsibility for the information contained in this prospectus
supplement. To our best knowledge, the information contained in this prospectus
supplement is accurate and complete in all material respects and does not omit
to state any facts necessary in order to make the statements in this prospectus
supplement not misleading in any material respect.

                            ------------------------

                        ABOUT THIS PROSPECTUS SUPPLEMENT

    This prospectus supplement contains the terms of this offering. This
prospectus supplement, or the information incorporated by reference in this
prospectus supplement, may add, update or change information in the attached
prospectus. If information in this prospectus supplement, or the information
incorporated by reference in this prospectus supplement, is inconsistent with
the attached prospectus, this prospectus supplement, or the information
incorporated by reference in this prospectus supplement, will apply and will
supersede the information in the attached prospectus.

    It is important for you to read and consider all information contained in
this prospectus supplement and the attached prospectus in making your investment
decision. You should also read and consider the information in the documents we
have referred you to in "Where You Can Find More Information."

    This prospectus supplement and the attached prospectus do not constitute an
offer or solicitation by anyone in any jurisdiction in which an offer or
solicitation is not authorized or in which the person making an offer or
solicitation is not qualified to do so, or to anyone to whom it is unlawful to
make an offer or solicitation.

                                      S-3
<PAGE>
                                    SUMMARY

    THIS SUMMARY HIGHLIGHTS INFORMATION CONTAINED ELSEWHERE IN THIS PROSPECTUS
SUPPLEMENT. BECAUSE IT IS A SUMMARY, IT DOES NOT CONTAIN ALL OF THE INFORMATION
THAT YOU SHOULD CONSIDER BEFORE INVESTING. YOU SHOULD READ THE ENTIRE PROSPECTUS
SUPPLEMENT, THE ACCOMPANYING PROSPECTUS AND THE DOCUMENTS INCORPORATED BY
REFERENCE CAREFULLY, INCLUDING THE SECTION ENTITLED "RISK FACTORS" AND THE
FINANCIAL STATEMENTS AND THE RELATED NOTES TO THOSE STATEMENTS INCLUDED IN THIS
PROSPECTUS SUPPLEMENT, THE ACCOMPANYING PROSPECTUS AND THE DOCUMENTS
INCORPORATED BY REFERENCE. EXCEPT AS OTHERWISE REQUIRED BY THE CONTEXT INCLUDING
WITH RESPECT TO THE DESCRIPTION OF THE NOTES, REFERENCES IN THIS PROSPECTUS
SUPPLEMENT TO "WE" OR "US" REFER TO THE COMBINED BUSINESS OF METROMEDIA FIBER
NETWORK, INC. AND ALL OF ITS SUBSIDIARIES. THE TERM "NOTES" REFERS TO THE
$750 MILLION 10% SENIOR NOTES DUE 2009 (THE "DOLLAR NOTES") AND THE
[EURO]250 MILLION 10% SENIOR NOTES DUE 2009 (THE "EURO NOTES") THAT WE ARE
OFFERING BY THIS PROSPECTUS SUPPLEMENT. THE TERM "YOU" REFERS TO PROSPECTIVE
INVESTORS IN THE NOTES.

                                  THE COMPANY

GENERAL

    We provide dedicated fiber optic infrastructure and high-bandwidth Internet
connectivity for our communications intensive customers. We are a
facilities-based provider of technologically advanced, high-bandwidth, fiber
optic communications infrastructure to communications carriers and corporate and
government customers in the United States and Europe. Through our acquisition of
AboveNet Communications, Inc. (often referred to as "AboveNet"), we also provide
"one-hop" connectivity that enables mission critical Internet applications to
thrive, as well as high-bandwidth infrastructure, including managed co-location
services.

    We currently have operations in, or under construction in, eleven Tier I
cities throughout the United States and seven selected international markets. We
intend to expand our presence to include approximately 50 Tier I and Tier II
markets in the United States and 17 major international markets.

RECENT EVENTS

    ACQUISITION OF ABOVENET.  On September 8, 1999, we completed the acquisition
of AboveNet for a total purchase price of approximately $1.9 billion. AboveNet
is a leading provider of high performance Internet connectivity solutions for
electronic commerce and other business critical Internet operations and
facilities-based, managed services for customer-owned Web servers and related
equipment, known as co-location services. AboveNet has developed a network
architecture based upon strategically located, fault-tolerant facilities, known
as Internet service exchanges. AboveNet's Internet service exchanges combine
direct access to Internet service providers, (often referred to as "ISPs"), with
co-location services for Internet content providers. As of September 30, 1999,
AboveNet had more than 270 direct public and private data exchange agreements,
known as peering arrangements, including relationships with most major network
providers. AboveNet's network architecture and extensive peering relationships
are designed to reduce the number of network connections or "hops" for data
traveling across the Internet. By having both Internet content providers and
Internet service providers at its Internet service exchanges, AboveNet enables
its Internet service provider customers to provide their users with "one-hop"
connectivity, through AboveNet's local area network, to the Web sites of the
Internet content providers that are co-located at the same facility. AboveNet's
customers include a wide range of Internet service providers, Internet content
providers and Web hosting companies.

    INVESTMENT BY BELL ATLANTIC.  On October 7, 1999, we entered into a
securities purchase agreement with Bell Atlantic Investments, Inc. (referred to
as "Bell Atlantic"), under which Bell Atlantic would purchase up to
approximately 25.6 million newly issued shares of our class A common stock at a
purchase price of $28.00 per share and a convertible subordinated note of
approximately $975.3 million, which is convertible into shares of our class
A common stock at a conversion price of $34.00 per share. We expect

                                      S-4
<PAGE>
this transaction, which is subject to customary closing conditions, to be
completed by the end of the first quarter of 2000. Assuming the issuance of the
25.6 million shares of class A common stock and conversion of the convertible
subordinated note, this investment would represent 19.9% of our outstanding
shares. Bell Atlantic has also agreed to pay us $550 million over the next three
years in exchange for delivery of fiber optic facilities over the next five
years. The proceeds from these two transactions will be used to fund the
expansion of our network.

NETWORK

    Our existing intra-city networks consist of approximately 425,000  fiber
miles covering in excess of 800 route miles in six of our announced markets. Our
inter-city network consists of approximately 120,000 fiber miles primarily
covering our 255 route-mile network that we have built between New York City and
Washington, D.C. We have also built or contracted to acquire (primarily through
fiber swaps) a nationwide dark fiber network linking our intra-city networks.

    In February 1999, we entered into an agreement with Viatel, Inc. and
Carrier 1 Holdings, Ltd. to jointly build a dark fiber inter-city network among
selected cities throughout Germany. Once completed, our German network will
consist of approximately 291,000 fiber miles covering 1,350 route miles
connecting 14 major cities. We have also swapped strands of fiber in the United
States for strands of fiber on the Circe network, which connects a number of
European markets. In addition to our inter-city networks, we are constructing 16
intra-city networks throughout Europe. Separately, we have also entered into a
contract to acquire dark fiber network facilities in Toronto, Canada.

    We have designed our networks to provide high levels of reliability,
security and flexibility by virtue of a self-healing synchronous optical network
(often referred to as "SONET") architecture that prevents interruption in
service to our clients by instantaneously rerouting traffic in the event of a
fiber cut. Our advanced network architecture is also capable of supporting
state-of-the-art technologies, including dense wave division multiplexing (often
referred to as "DWDM") which significantly increases the transmission capacity
of a strand of fiber optic cable. Because DWDM can boost transmission capacity
significantly, it has greater relevance on our inter-city routes where we have,
on average, fewer strands of fiber installed than in our intra-city markets. We
install most of our fiber inside high-density polyethylene conduit to protect
the cable and, where practicable, we install additional unused conduits to cost
effectively accommodate future network expansion and eliminate the need for
future construction.

    We believe that the market for our services in these areas is characterized
by significant and growing demand for, and limited supply of, fiber optic
capacity. To meet our customers' demand, we tailor the amount of fiber capacity
leased to the needs of our customers. Generally, customers lease fiber optic
capacity from us and connect their own transmission equipment to the leased
fiber, thereby obtaining a high-bandwidth, fixed-cost, secure communications
alternative to the metered communications services offered by traditional
providers. In addition, we believe that we have installation, operating and
maintenance cost advantages per fiber mile relative to our competitors because
we generally install 432 fibers, and have begun installing as many as 864 fibers
per route mile, as compared to the generally lower number of fibers per mile in
existing competitive networks.

    We believe the market for our Internet service exchanges is characterized by
significant and growing demand for, and limited access to, highly reliable
Internet connectivity and co-location services. To meet our customers' demands,
we provide scalable connectivity and co-location services that drive our
customers' electronic commerce and other mission critical Internet applications.
Our customers lease bandwidth and co-location space from us to gain highly
reliable, secure and cost effective Internet connectivity. Through our existing
and planned networks, we believe we have the low cost position relative to those
competitors who lease rather than own their networks.

                                      S-5
<PAGE>
CUSTOMERS

    We are focused on providing our broadband communications infrastructure and
Internet connectivity services to two main customer groups located in Tier I and
Tier II markets: communications carriers and corporate/government customers.

    Our targeted customers include a broad range of companies such as:

    - incumbent local exchange carriers (often referred to as "ILECs");

    - competitive local exchange carriers (often referred to as "CLECs");

    - long distance companies/interexchange carriers (often referred to as
      "IXCs");

    - paging, cellular and PCS companies;

    - cable companies;

    - ISPs; and

    - Web hosting and e-commerce companies.

    Our dark fiber customers typically lease our fiber optic capacity with which
they develop their own communications networks. Leasing our fiber optic capacity
is a low-cost alternative to building their own infrastructure or purchasing
metered services from ILECs or CLECs. Our Internet connectivity and co-location
customers typically lease bandwidth and co-location space which allow them to
provide their Internet related services on a reliable and cost effective basis.
We believe that we are well-positioned to penetrate our target customer base
since we plan to install most of our dark fiber networks and Internet service
exchanges in major markets where these customers are concentrated. We believe
our target customers for our dark fiber and Internet connectivity services are
complementary and will provide significant cross-selling opportunities.

MARKET OPPORTUNITY

    We intend to capitalize on the increasing demand for high-bandwidth
dedicated communications services and the limited supply of such transmission
capacity. Based on management experience and industry reports, we believe that
demand for the broadband communications infrastructure afforded by our network
will continue to increase as a result of the following factors:

    - the rapid growth of communications traffic, such as data traffic, which
      industry research indicates is growing by 35% annually;

    - the large number of new carriers which will require significant
      transmission capabilities in all sectors of the communications industry,
      due in large part to industry deregulation facilitated by the
      Telecommunications Act of 1996 (often referred to as the "1996 Telecom
      Act");

    - the fact that the Regional Bell Operating Companies (often referred to as
      the "RBOCs") and other major ILECs will likely need to upgrade to fiber
      optic networks with infrastructure similar to ours; and

    - the advent of new communications services requiring large amounts of
      transmission capacity, such as Internet, intranet and video services.

    Based on industry sources, we estimate that the total 1998 market for
communications services in the United States was approximately $237 billion and
will grow to approximately $341 billion by the year 2002. In addition, we
believe that there will be increased demand for our infrastructure due to our
ability to offer fixed-cost pricing which is generally more economical for high
volume users than traditional usage-based pricing. Based on industry sources, we
estimate that worldwide Internet revenues for 1998 were approximately
$20 billion, and will grow to approximately $83 billion by the year 2002. We
expect continued rapid growth in Internet revenues as Internet use increases and
electronic commerce applications gain widespread acceptance.

                                      S-6
<PAGE>
BUSINESS STRATEGY

    Our objective is to become the preferred facilities-based provider of
broadband communications infrastructure and Internet connectivity solutions to
communications carriers, corporations and government agencies, in our target
markets. The following are the key elements of our strategy to achieve this
objective:

    ESTABLISH OUR COMPANY AS THE PREFERRED CARRIERS' CARRIER OF BROADBAND
    COMMUNICATIONS
    INFRASTRUCTURE AND INTERNET CONNECTIVITY SOLUTIONS

    We lease broadband communications infrastructure on a fixed-cost basis to
various communications carriers, thus enabling them to compete in markets which
were previously difficult to penetrate due to limited and/or costly access to
high-bandwidth communications infrastructure. We lease bandwidth and

co-location space to various Internet service providers enabling them to provide
reliable, high-quality Internet access services to their customers. We also
believe that carrier customers may be more likely to lease services from us,
rather than from a competitor, since we currently have no plans to offer
competing metered communications or retail Internet connectivity services.

    POSITION OUR COMPANY AS THE PREFERRED PROVIDER OF BROADBAND COMMUNICATIONS
    INFRASTRUCTURE AND
    INTERNET CONNECTIVITY SERVICES TO CORPORATE AND GOVERNMENT CUSTOMERS

    Our target customers for broadband communications infrastructure are those
with significant transmission needs or who require a high degree of security.
Our target customers for Internet connectivity services are those who require
reliable, secure and cost effective connectivity to the Internet to drive
electronic commerce and other mission critical business Internet applications.
In many cases, we believe our communications infrastructure and Internet
connectivity customer bases are complementary and will create significant cross
selling opportunities.

    REPLICATE SUCCESSFUL BUSINESS MODEL IN NEW MARKETS

    We seek to leverage the success we have demonstrated in our existing markets
by replicating our network architecture in a number of additional markets.
Specifically, we intend to:

    - complete the construction of a total of approximately 50 intra-city
      networks in Tier I and Tier II markets;

    - replicate our successful domestic strategy in selected international
      markets; and

    - deploy Internet service exchanges in selected U.S. and international
      markets.

    CREATE A LOW COST POSITION

    We believe that we have established a low cost position relative to other
communications carriers primarily because we install trunks with substantially
more fibers per route mile as well as spare conduits, thereby reducing the cost
per fiber mile to construct, upgrade and operate our networks. We believe that
we have established the low cost position relative to other Internet
connectivity providers who lease rather than own their networks. Our low cost
position should allow us to remain price competitive with other providers of
broadband communications infrastructure and Internet connectivity services and
to provide customers a cost effective alternative to constructing their own
networks or Internet connectivity facilities.

    UTILIZE FIBER SWAPS AND STRATEGIC RELATIONSHIPS TO EXPAND THE REACH OF OUR
     NETWORKS

    We have completed a number of fiber swaps to date and will continue to
explore strategic opportunities to expand the reach of our networks at little
incremental cost. We also plan to enter into strategic

                                      S-7
<PAGE>
relationships, such as our joint build arrangement with Viatel in Europe, to
cost effectively expand our network footprint.

    EXPAND PRODUCT AND SERVICE OFFERINGS TO UTILIZE DARK FIBER NETWORK CAPACITY

    We intend to identify additional uses for our dark fiber network that will
drive new revenue opportunities and cost synergies. We may develop these
applications internally or by acquiring them through strategic acquisitions,
although none are currently planned. As was the case with our acquisition of
AboveNet, we intend to continue to serve carriers and large corporate and
government customers with regard to their bandwidth intensive communications
needs.

    INSTALL TECHNOLOGICALLY ADVANCED NETWORKS AND INTERNET SERVICE EXCHANGES

    We have installed a technologically advanced network based on a self-healing
SONET architecture that we believe provides the high levels of reliability,
security, and flexibility that our target customers typically demand. Our
Internet service exchanges provide fault tolerant facilities designed to enable
the uninterrupted operations necessary for mission critical Internet business
applications. Furthermore, our proprietary software monitors network connection
for latency and packet loss, thereby allowing us to automatically reroute
traffic to avoid Internet congestion points.

    BUILD ON MANAGEMENT EXPERIENCE AND METROMEDIA COMPANY RELATIONSHIP

    Our management team and board of directors include individuals with
communications industry expertise and extensive experience in network design,
construction, operations and sales. Our Chief Executive Officer and founder,
Stephen A. Garofalo, has approximately 25 years of experience in the cable
installation business. Howard Finkelstein, our President and Chief Operating
Officer, served in various capacities in Metromedia Company over a period of
16 years, including 9 years as president of Metromedia Company's long distance
telephone company, until its merger with MCI/WorldCom, Inc. in 1993. We also
benefit from the communications industry expertise and corporate governance
experience of John W. Kluge, Stuart Subotnick and David Rockefeller. As the
owner of all of our class B common stock, Metromedia Company and its general
partners control our board of directors and all stockholder decisions and, in
general, determine the outcome of any corporate transaction or other matters
submitted to the stockholders for approval. Sherman Tuan and David Rand have
joined our board of directors following the acquisition of AboveNet and have
extensive experience with Internet related ventures. Please refer to the
sections in this prospectus supplement entitled "Risk Factors--Metromedia
Company Effectively Controls Our Company and Has the Power to Cause or Prevent a
Change of Control" and "Certain Relationships and Related Transactions."

                            ------------------------

    We were founded in 1993 and are a Delaware corporation. Our principal
executive offices are located at One North Lexington Avenue, White Plains, New
York 10601. Our telephone number is (914) 421-6700.

                                      S-8
<PAGE>
                                  THE OFFERING

<TABLE>
<S>                                         <C>
Issuer....................................  Metromedia Fiber Network, Inc.
Notes Offered.............................  We are offering $750 million aggregate principal amount
                                            of 10% Senior Notes due 2009 (referred to as the "Dollar
                                            notes").
                                            In addition, we are offering [EURO]250 million aggregate
                                            principal amount of 10% Senior Notes due 2009 (referred
                                            to as the "Euro notes").
Maturity..................................  The notes will mature on December 15, 2009 at a price
                                            equal to 100% of the principal amount of the notes.
Interest..................................  The Dollar notes will accrue interest from the date of
                                            their issuance at the rate of 10% per year. The Euro
                                            notes will accrue interest from the date of their
                                            issuance at the rate of 10% per year. In both cases, the
                                            interest on the notes will be payable semi-annually in
                                            arrears on each June 15 and December 15, commencing on
                                            June 15, 2000.
Sinking Fund..............................  None.
Optional Redemption.......................  Except as set forth below and under "Change of Control,"
                                            we may not redeem the notes prior to December 15, 2004.
                                            After December 15, 2004, we may redeem the notes, in
                                            whole or in part, at any time, at the redemption prices
                                            set forth below under the section entitled "Description
                                            of the Notes" together with accrued and unpaid interest,
                                            if any, to the redemption date. In addition, at any time
                                            and from time to time prior to December 15, 2002, we may
                                            redeem up to 35% of the aggregate principal amount of
                                            each of the Dollar notes and the Euro notes, determined
                                            separately, at a redemption price equal to 110% of the
                                            principal amount, in the case of the Dollar notes
                                            redeemed, and 110% of the principal amount, in the case
                                            of the Euro notes redeemed, in each case plus accrued
                                            and unpaid interest, if any, through the date of
                                            redemption, if:
                                            -  we use the net cash proceeds of any public equity
                                            offerings resulting in gross proceeds of at least $100
                                               million; and
                                            -  at least 65% of the aggregate principal amount of the
                                            Dollar notes and the Euro notes, determined separately,
                                               originally issued pursuant to the indenture remain
                                               outstanding immediately after giving effect to such
                                               redemption.
Change of Control.........................  Upon a "Change of Control," you as a holder of notes
                                            will have the right to require us to repurchase all of
                                            your notes at a repurchase price equal to 101% of the
                                            aggregate principal amount, plus accrued and unpaid
                                            interest, if any, through the date of repurchase.
Ranking...................................  The notes will be general unsecured obligations, will
                                            rank equal in right of payment with all our other
                                            existing and future senior unsecured indebtedness and
                                            will be effectively subordinated to all our existing and
                                            future secured indebtedness to the extent of the assets
                                            that secure such indebtedness and to all of our
                                            subsidiaries existing or future indebtedness, whether or
                                            not secured.
</TABLE>

                                      S-9
<PAGE>

<TABLE>
<S>                                         <C>
Restrictive Covenants.....................  The indenture under which the notes will be issued may
                                            limit:
                                            -  the incurrence of additional indebtedness or
                                            preferred stock by us and our subsidiaries;
                                            -  the payment of dividends on, and repurchase or
                                            redemption of, our capital stock and our subsidiaries'
                                               capital stock and the repurchase or redemption of our
                                               subordinated obligations;
                                            -  investments, sales of assets and subsidiary stock;
                                            -  transactions with affiliates; and
                                            -  the incurrence of additional liens.
                                            In addition, the indenture will limit our ability to
                                            engage in consolidations, mergers and transfers of
                                            substantially all of our assets and also contain
                                            restrictions on distributions from our subsidiaries. All
                                            of these limitations and prohibitions will be subject to
                                            a number of important qualifications and exceptions.
                                            Please refer to the sections of this prospectus
                                            supplement entitled "Description of the Notes" and "Risk
                                            Factors--Risk Factors Relating to the Notes."
Absence of a Public Market
  for the Notes...........................  Application has been made to list the notes on the
                                            Luxembourg Stock Exchange. However, the notes are a new
                                            issue of securities and there is currently no
                                            established market for them. Accordingly, there can be
                                            no assurance as to the development or liquidity of any
                                            market for the notes. The underwriters have advised us
                                            that they currently intend to make a market in the notes
                                            as permitted by applicable laws and regulations.
                                            However, they are not obligated to do so and may
                                            discontinue any such market making activities at any
                                            time without notice.
Use of Proceeds...........................  We estimate that the net proceeds after expenses from
                                            the offering of the notes will be approximately
                                            $975.3 million. We expect to use the net proceeds for
                                            the build-out of our intra-city and inter-city networks
                                            in the United States and Europe and for other capital
                                            expenditures, including possible acquisitions of other
                                            companies or assets. Please refer to the section of this
                                            prospectus supplement entitled "Use of Proceeds."
</TABLE>

                                  RISK FACTORS

    You should consider carefully the information set forth in the section
entitled "Risk Factors" beginning on page S-13 of this prospectus supplement and
on page 3 of the accompanying prospectus and all the other information provided
to you in this prospectus supplement, the accompanying prospectus and the
documents incorporated by reference in deciding whether to invest in the notes.

                                      S-10
<PAGE>
                      SUMMARY CONSOLIDATED FINANCIAL DATA

    The summary historical consolidated financial data presented below for the
years ended December 31, 1996, 1997 and 1998 have been derived from our
consolidated financial statements and the related notes included in this
prospectus supplement beginning on page F-1. Our consolidated financial
statements for the years ended December 31, 1996, 1997 and 1998 have been
audited by Ernst & Young LLP, independent auditors. The summary consolidated
financial data for the nine months ended September 30, 1998 and 1999 and the
summary historical balance sheet data as of September 30, 1999 have been derived
from our unaudited consolidated financial statements, which we believe include
all adjustments necessary for a fair presentation of the financial condition and
results of operations for those periods. The results of operations for interim
periods are not necessarily indicative of the results for a full year's
operations.

    The summary unaudited pro forma statements of operations for the year ended
December 31, 1998 and for the nine months ended September 30, 1999 give effect
to our acquisition of AboveNet and AboveNet's acquisition of Palo Alto Internet
Exchange as if they had been consummated on January 1, 1998. The summary
unaudited pro forma balance sheet as of September 30, 1999 gives pro forma
effect to the following transactions:

    - the offering of the notes, as if it had been consummated on September 30,
      1999; and

    - the offering of the notes and the purchase by Bell Atlantic of shares of
      our class A common stock and the convertible subordinated note, which
      purchase has not yet been consummated and is subject to customary closing
      conditions, as if they had been consummated on September 30, 1999.

    The pro forma adjustments are based upon available information and
assumptions that we believe are reasonable at the time made. The summary
unaudited pro forma financial data  do not purport to present our financial
position or results of operations had the transactions occurred on the dates
specified, nor are they necessarily indicative of the financial position or
results of operations that may be achieved in the future.

    As you read the summary consolidated financial data, please refer to the
following: "Risk Factors--Failure to Consummate the Bell Atlantic Transactions
May Cause Us to Seek Alternative Financing," "Unaudited Pro Forma Condensed
Combining Financial Information," "Capitalization," "Management's Discussion and
Analysis of Financial Condition and Results of Operations," "Business," the
consolidated financial statements and the related notes of our company, AboveNet
and Palo Alto Internet Exchange and the other financial data appearing in this
prospectus supplement.

                                      S-11
<PAGE>

<TABLE>
<CAPTION>
                                                       YEAR ENDED                                NINE MONTHS
                                                      DECEMBER 31,                           ENDED SEPTEMBER 30,
                                                      ------------                           -------------------
                                                                        PRO FORMA                            PRO FORMA
                                                                       FOR ABOVENET                         FOR ABOVENET
                                                                        AQUISITION                          ACQUISITION
                                        1996       1997       1998         1998         1998       1999         1999
                                      --------   --------   --------   ------------   --------   --------   ------------
                                                            (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                   <C>        <C>        <C>        <C>            <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenues............................  $    236   $  2,524   $36,436      $ 47,575     $20,840    $ 49,397    $  70,641
Expenses:
  Cost of sales.....................       699      3,572    13,937        24,071       9,499      24,414       50,353
  Selling, general and
    administrative..................     2,070      6,303    14,712        23,005       9,811      27,369       46,611
  Depreciation and amortization.....       613        757     1,532        80,534         738      15,645       77,395
  Consulting and employment
    incentives......................     3,652     19,218     3,648         6,044       3,648          --          654
                                      --------   --------   -------      --------     -------    --------    ---------
(Loss) income from operations.......    (6,798)   (27,326)    2,607       (86,079)     (2,856)    (18,031)    (104,372)
Interest income (expense), net......    (3,561)     1,067     1,927         1,735       5,012     (25,784)     (22,885)
(Loss) from joint venture...........        --         --      (146)         (146)       (264)       (475)        (872)
Income taxes........................        --         --     3,402            --         825          --           --
                                      --------   --------   -------      --------     -------    --------    ---------
Net (loss) income...................  $(10,359)  $(26,259)  $   986      $(84,490)    $ 1,067    $(44,290)   $(128,129)
                                      ========   ========   =======      ========     =======    ========    =========
Net (loss) income applicable to
  common stockholders per share.....  $  (0.14)  $  (0.28)  $  0.01      $  (0.37)    $  0.01    $   0.23    $   (0.55)
                                      ========   ========   =======      ========     =======    ========    =========
Weighted average number of shares
  outstanding.......................    71,716     94,894   186,990       228,642     186,392     190,639      230,920
                                      ========   ========   =======      ========     =======    ========    =========
Ratio of earnings to fixed
  charges(1)........................        --         --      1.61            --        9.95          --           --
EBITDA(2)...........................  $ (6,185)  $(26,569)  $ 3,993      $ (5,691)    $(3,207)   $ (2,861)   $ (27,849)
Adjusted EBITDA(2)..................  $ (2,533)  $ (7,351)  $ 7,641      $    353     $   441    $ (2,861)   $ (27,195)
Cash dividends per share............  $     --   $     --   $    --      $     --     $    --    $     --    $      --
</TABLE>

<TABLE>
<CAPTION>
                                                                        AS OF SEPTEMBER 30, 1999
                                                              ---------------------------------------------
                                                                                              PRO FORMA FOR
                                                                              PRO FORMA       BELL ATLANTIC
                                                                ACTUAL     FOR THE OFFERING    INVESTMENT
                                                              ----------   ----------------   -------------
                                                                             (IN THOUSANDS)
<S>                                                           <C>          <C>                <C>
BALANCE SHEET DATA:
Cash and cash equivalents...................................  $  352,900      $1,328,187       $3,019,095
Pledged securities(3).......................................      63,864          63,864           63,864
Property and equipment, net.................................     564,798         564,798          564,798
Total assets................................................   2,918,401       3,921,224        5,612,132
Long-term debt..............................................     689,056       1,691,859        2,667,140
Total liabilities...........................................     938,408       1,941,231        2,916,512
Stockholders' equity........................................   1,979,993       1,979,993        2,695,620
</TABLE>

(1) Earnings were insufficient to cover fixed charges in the years ended
    December 31, 1996 and 1997 and for the nine months ended September 30, 1999.
    The deficiency was $10,359,000, $26,259,000, and $44,290,000 for the years
    ended December 31, 1996 and 1997 and for the nine months ended
    September 30, 1999, respectively. Pro forma earnings were insufficient to
    cover the pro forma fixed charges in the year ended December 31, 1998 and
    for the nine months ended September 30, 1999. The pro forma deficiency was
    $84,490 and $128,129 for the year ended December 31, 1998 and the nine
    months ended September 30, 1999, respectively.

(2) "EBITDA" consists of earnings (loss) before income taxes plus all net
    interest expense and all depreciation and amortization expense. "Adjusted
    EBITDA" consists of earnings (loss) before income taxes plus all net
    interest expense, depreciation and amortization and non-cash employment and
    consulting incentives and settlements. You should not think of EBITDA and
    Adjusted EBITDA as alternative measures of operating results or cash flows
    from operating activities (as determined in accordance with generally
    accepted accounting principles). We have included EBITDA and Adjusted EBITDA
    because they are widely used financial measures of the potential capacity of
    a company to incur and service debt. Our reported EBITDA and Adjusted EBITDA
    may not be comparable to similarly titled measures used by other companies.

(3) Represents amounts deposited with the security agent pursuant to a security
    agreement to make payments of interest through May 15, 2000 on our 10%
    Senior Notes due 2008.

                                      S-12
<PAGE>
                                  RISK FACTORS

    YOU SHOULD CAREFULLY CONSIDER THE INFORMATION BELOW IN ADDITION TO ALL OTHER
INFORMATION PROVIDED TO YOU IN THIS PROSPECTUS SUPPLEMENT, THE ACCOMPANYING
PROSPECTUS AND THE DOCUMENTS INCORPORATED BY REFERENCE IN DECIDING WHETHER TO
INVEST IN THE NOTES, INCLUDING INFORMATION IN THE SECTION ENTITLED "SPECIAL NOTE
REGARDING FORWARD LOOKING STATEMENTS."

RISK FACTORS RELATING TO OUR BUSINESS

WE HAVE A LIMITED HISTORY OF OPERATIONS

    You will have limited historical financial information upon which to base
your evaluation of our performance. Our company was formed in April 1993 and has
a limited operating history. We currently have a limited number of customers and
are still in the process of building many of our networks. Accordingly, you must
consider our prospects in light of the risks, expenses and difficulties
frequently encountered by companies in their early stage of development.

WE EXPECT TO CONTINUE TO INCUR NET LOSSES

    In connection with the construction of our networks, we have incurred
substantial net losses and have not generated positive cash flow from
operations. There can be no assurance that we will generate net income or that
we will sustain positive cash flow in the future.

    We cannot assure you that we will succeed in establishing an adequate
revenue base or that our services will generate profitability. In connection
with the construction of our networks, we have incurred substantial losses. We
expect to continue incurring losses while we concentrate on the development and
construction of our networks and until our networks have established a
sufficient revenue-generating customer base. We also expect to incur losses
during the initial startup phases of any services that we may provide. We expect
to continue experiencing net operating losses for the foreseeable future.
Continued losses may prevent us from pursuing our strategies for growth and
could cause us to be unable to meet our debt service obligations, capital
expenditure requirements or working capital needs.

WE HAVE SUBSTANTIAL DEBT WHICH MAY LIMIT OUR ABILITY TO BORROW, RESTRICT THE USE
  OF OUR CASH FLOWS AND CONSTRAIN OUR BUSINESS STRATEGY, AND WE MAY NOT BE ABLE
  TO MEET OUR DEBT OBLIGATIONS

    LARGE AMOUNT OF DEBT

    We have, and will continue to have after the offering of the notes,
substantial debt and debt service requirements. Following the offering of the
notes, we will have total debt of approximately $1.7 billion. In addition, the
purchase by Bell Atlantic of a convertible subordinated note will increase our
total debt to approximately $2.7 billion. As the indentures governing our debt
allow us to borrow additional amounts in certain cases to finance the
construction and improvement of our networks, we intend to explore market
conditions in order to obtain additional financing, including additional
long-term fixed-rate financing or senior revolving credit facilities.

    CONSEQUENCES OF DEBT

    Our substantial debt has important consequences, including:

    - our ability to borrow additional amounts for working capital, capital
      expenditures or other purposes is limited;

    - a substantial portion of our cash flow from operations is required to make
      debt service payments; and

                                      S-13
<PAGE>
    - our leverage could limit our ability to capitalize on significant business
      opportunities and our flexibility to react to changes in general economic
      conditions, competitive pressures and adverse changes in government
      regulation.

    You should be aware that our ability to repay or refinance our debt,
including the notes, depends on our successful financial and operating
performance and on our ability to successfully implement our business strategy.
Unfortunately, we cannot assure you that we will be successful in implementing
our strategy or in realizing our anticipated financial results. You should also
be aware that our financial and operational performance depends upon a number of
factors, many of which are beyond our control. These factors include:

    - the economic and competitive conditions in the telecommunications network
      and Internet-related industries;

    - any operating difficulties, increased operating costs or pricing pressures
      we may experience;

    - the passage of legislation or other regulatory developments that may
      adversely affect us;

    - any delays in implementing any strategic projects;

    - our ability to complete our networks on time and in a cost-effective
      manner; and

    - our ability to apply our business strategies in foreign cities.

    We cannot assure you that our cash flow and capital resources will be
sufficient to repay our existing indebtedness, including the notes, and any
indebtedness we may incur in the future, or that we will be successful in
obtaining alternative financing. In the event that we are unable to repay our
debts, we may be forced to reduce or delay the completion or expansion of our
networks, sell some of our assets, obtain additional equity capital or refinance
or restructure our debt. If we are unable to meet our debt service obligations
or comply with our covenants, a default under our existing debt agreements would
result. To avoid a default, we may need waivers from third parties, which might
not be granted. You should also read the information we have included in this
prospectus supplement in the sections entitled "--Risk Factors Relating to the
Notes," "Description of Other Indebtedness," "Description of the Notes" and
"Business--Business Strategy."

    RESTRICTIVE DEBT COVENANTS

    The indenture will contain a number of covenants. These covenants may limit
our ability to, among other things:

    - borrow additional money;

    - make capital expenditures and other investments;

    - pay dividends;

    - merge, consolidate, or dispose of our assets; and

    - enter into transactions with our affiliates.

    Our failure to comply with these covenants would cause a default under the
indenture. A default, if not waived, could result in acceleration of our
indebtedness, in which case the debt would become immediately due and payable.
If this occurs, we may not be able to repay our debt or borrow sufficient funds
to refinance it. Even if new financing is available, it may not be on terms that
are acceptable to us. Complying with these covenants may cause us to take
actions that we otherwise would not take or not take actions that we otherwise
would take. Please refer to the sections in this prospectus supplement entitled
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources" and "Description of Other
Indebtedness."

                                      S-14
<PAGE>
WE MAY NOT BE ABLE TO SUCCESSFULLY IMPLEMENT OUR BUSINESS STRATEGY BECAUSE WE
  DEPEND ON FACTORS BEYOND OUR CONTROL, WHICH COULD ADVERSELY AFFECT OUR RESULTS
  OF OPERATIONS

    Our future largely depends on our ability to implement our business strategy
and proposed expansion in order to create the new business and revenue
opportunities. Our results of operations will be adversely affected if we cannot
fully implement our business strategy. Successful implementation depends on
numerous factors beyond our control, including economic, competitive and other
conditions and uncertainties, the ability to obtain licenses, permits,
franchises and rights-of-way on reasonable terms and conditions and the ability
to hire and retain qualified management personnel.

A CHANGE IN ACCOUNTING STANDARDS HAS REQUIRED US TO CHANGE OUR TIMING OF
RECOGNIZING REVENUES

    Effective June 30, 1999, the Financial Accounting Standards Board issued
FASB Interpretation No. 43 "Real Estate Sales" ("FIN 43") which requires that
sales of integral equipment be accounted for in accordance with real estate
accounting rules. We believe that the SEC requires the classification of dark
fiber cables in the ground as integral equipment as defined in FIN 43.
Accounting for dark fiber contracts does not change any of the economics of the
contracts. It requires us, however, to recognize the revenue from certain
contracts as operating leases over the term of the contract as opposed to the
current method of recognizing revenue during the period over which we deliver
the fiber. As a result, this change in accounting treatment reduces the revenue
and income that we recognize in the earlier years of the contract and spreads it
out over the life of the contract regardless of when the cash was received or
the delivery of the fiber took place.

    We implemented accounting for certain of our contracts, entered into after
June 30, 1999, under this method of accounting. As a result, although there was
no change to the economics of the contracts or the timing of the cash to be
received by us, the impact of the change in accounting resulted in our recording
$10.7 million in revenues for the quarter ended September 30, 1999 rather than
$32.7 million that would have been recorded prior to this change. Please refer
to "Management's Discussion and Analysis of Financial Condition and Results of
Operations--General."

FAILURE TO CONSUMMATE THE BELL ATLANTIC TRANSACTIONS MAY CAUSE US TO SEEK
  ALTERNATIVE FINANCING

    In connection with Bell Atlantic's investment, we expect to receive
approximately $1.7 billion in net proceeds from Bell Atlantic for the purchase
of shares of our class A common stock and a convertible subordinated note. In
addition, Bell Atlantic has agreed to purchase a minimum of $550.0 million of
fiber optic facilities payable over the next three years. We plan to use the net
proceeds from the Bell Atlantic transactions to accelerate the build out of our
nationwide dark fiber infrastructure as well as to enter new markets in the
United States and internationally. If Bell Atlantic's investment, which is
subject to customary closing conditions, does not close, we would need to obtain
alternative sources of financing to complete the construction of our networks,
which may not be available on comparable terms, if at all. Locating an
alternative financing source could slow our growth and have a material adverse
affect on us.

WE CANNOT BE CERTAIN THAT WE WILL BE SUCCESSFUL IN INTEGRATING ABOVENET INTO OUR
  BUSINESS

    We believe that our acquisition of AboveNet will result in benefits to the
combined companies, including the expansion of our product and service offerings
and the combination of our fiber optic network with AboveNet's Internet
connectivity solutions. If we are not able to effectively integrate our
technology, operations and personnel in a timely and efficient manner, then the
benefits of our acquisition will not be realized and, as a result, our operating
results may be adversely affected. In particular, if the integration is not
successful:

    - we may lose key personnel; and

    - we may not be able to retain AboveNet's customers.

                                      S-15
<PAGE>
    In addition, the attention and effort devoted to the integration of the two
companies will significantly divert management's attention from other important
issues, and could significantly harm the combined companies' business and
operating results.

WE CANNOT ASSURE YOU THAT WE WILL SUCCESSFULLY COMPLETE THE CONSTRUCTION OF OUR
  NETWORKS

    The construction of future networks and the addition of Internet service
exchange facilities entail significant risks, including management's ability to
effectively control and manage these projects, shortages of materials or skilled
labor, unforeseen engineering, environmental or geological problems, work
stoppages, weather interference, floods and unanticipated cost increases. The
failure to obtain necessary licenses, permits and authorizations could prevent
or delay the completion of construction of all or part of our networks or
increase completion costs. In addition, AboveNet's establishment and maintenance
of interconnections with other network providers at various public and private
points is necessary for AboveNet to provide cost efficient services. We cannot
assure you that the budgeted costs of our current and future projects will not
be exceeded or that these projects will commence operations within the
contemplated schedules, if at all.

WE CANNOT ASSURE YOU THAT A MARKET FOR OUR CURRENT OR FUTURE SERVICES WILL
  DEVELOP

    The practice of leasing dark fiber, which is fiber optic cable without any
of the electronic or optronic equipment necessary to use the fiber for
transmission, is not widespread and we cannot assure you that the market will
develop or that we will be able to enter into contracts, comply with the terms
of these contracts or maintain relationships with communications carriers and
corporate and government customers. We also cannot assure you that these
contracts or relationships will be on economically favorable terms or that
communications carriers and corporate and government customers will not choose
to compete against, rather than cooperate with us. If we are unable to enter
into contracts, comply with the terms of the contracts or maintain relationships
with these constituencies, our operations would be materially and adversely
affected. We cannot predict whether providing services to governments will
evolve into a significant market because governments usually already control
existing rights-of-way and often build their own communications infrastructure.
We will need to strengthen our marketing efforts and increase our staff to
handle future marketing and sales requirements. If we fail to obtain
significant, widespread commercial and public acceptance of our networks and
access to sufficient buildings our visibility in the telecommunications market
could be jeopardized. We cannot assure you that we will be able to secure
customers for the commercial use of our proposed networks or access to such
buildings in each market. In addition, the market for co-location and Internet
services, which are offered by AboveNet, is new and evolving. We cannot assure
you that AboveNet's services will achieve widespread acceptance in this new
market. Further, AboveNet's success depends in large part on growth in the use
of the Internet. The growth of the Internet is highly uncertain and depends on a
variety of factors.

    We may expand the range of services that we offer. These services may
include assisting customers with the integration of their leased dark fiber with
appropriate electronic and optronic equipment by facilitating the involvement of
third party suppliers, vendors and contractors. We cannot assure you that a
market will develop for our new services, that implementing these services will
be technically or economically feasible, that we can successfully develop or
market them or that we can operate and maintain our new services profitably.

SEVERAL OF OUR CUSTOMERS MAY TERMINATE THEIR AGREEMENTS WITH US IF WE DO NOT
  PERFORM BY SPECIFIED TIMES

    We currently have some contracts to supply leased fiber capacity which allow
the lessee to terminate the contracts and/or provide for liquidated damages if
we do not supply the stated fiber capacity by a specified time. Terminating any
of these contracts could adversely affect our operating results.

                                      S-16
<PAGE>
WE MAY BE UNABLE TO RAISE THE ADDITIONAL FINANCING NECESSARY TO COMPLETE THE
  CONSTRUCTION OF OUR NETWORKS, WHICH WOULD ADVERSELY AFFECT OUR LONG-TERM
  BUSINESS STRATEGY

    We may need significant amounts of additional capital to complete the
build-out of our planned fiber optic communications networks, to expand
AboveNet's network infrastructure and to meet our long-term business strategies,
including expanding our networks to additional cities and constructing our
networks in Europe. If we need additional funds, our inability to raise them
will have an adverse effect on our operations. If we decide to raise additional
funds by incurring debt, we may become more leveraged and subject to additional
or more restrictive financial covenants and ratios.

    Our ability to arrange financing and the cost of financing depends upon many
factors, including:

    - general economic and capital markets conditions generally, and in
      particular the non-investment grade debt market;

    - conditions in the telecommunications and Internet markets;

    - regulatory developments;

    - credit availability from banks or other lenders;

    - investor confidence in the telecommunications and Internet industries and
      in us;

    - the success of our fiber optic communications network and Internet
      services; and

    - provisions of tax and securities laws that are conductive to raising
      capital.

COMPETITORS OFFER SERVICES SIMILAR TO OURS IN OUR CURRENT OR PLANNED MARKETS
  WHICH WOULD AFFECT OUR RESULTS OF OPERATIONS

    The telecommunications industry and AboveNet's business are extremely
competitive, particularly with respect to price and service, which may adversely
affect our results of operations. A significant increase in industry capacity or
reduction in overall demand would adversely affect our ability to maintain or
increase prices. In the telecommunications industry, we compete against
incumbent local exchange carriers, which have historically provided local
telephone services and currently dominate their local telecommunications
markets, and competing carriers in the local services market. In addition to
these carriers, several other potential competitors, such as facilities-based
communications service providers, cable television companies, electric
utilities, microwave carriers, satellite carriers, wireless telephone system
operators and large end-users with private networks, are capable of offering,
and in some cases offer, services similar to those offered by us. Furthermore,
several of these service providers, such as wireless service providers, could
build wireless networks more rapidly and at lower cost than fiber optic
networks. Additionally, the business in which AboveNet competes is highly
competitive due to a lack of barriers to entry and high price sensitivity. Many
of our competitors have greater financial, research and development and other
resources than we do.

    Some of our principal competitors already own fiber optic cables as part of
their telecommunications networks. Accordingly, any of these carriers, some of
which already have franchise and other agreements with local and state
governments and substantially greater resources and more experience than us,
could directly compete with us in the market for leasing fiber capacity, if they
are willing to offer this capacity to their customers. In addition, some
communications carriers and local cable companies have extensive networks in
place that could be upgraded to fiber optic cable, as well as numerous personnel
and substantial resources to begin construction to equip their networks. If
communications carriers and local cable companies decide to equip their networks
with fiber optic cable, they could become significant competitors. Our franchise
and other agreements with the city of New York and other local and state
governments are not exclusive. Potential competitors with greater resources and
more experience than us could enter into franchise and other agreements with
local and state governments and compete directly

                                      S-17
<PAGE>
with us. Other companies may choose to compete with us in our current or planned
markets, including Europe, by leasing fiber capacity, including dark fiber, to
our targeted customers. This additional competition could materially and
adversely affect our operations.

WE DEPEND ON A LIMITED NUMBER OF CUSTOMERS AND ARE MORE VULNERABLE TO CHANGING
  ECONOMIC CONDITIONS AND CONSUMER PREFERENCES

    We are particularly dependent on a limited number of customers. In addition,
AboveNet has a long sales cycle. We are, therefore, more susceptible to the
impact of poor economic conditions than our competitors with a more balanced mix
of business.

REGULATION OF THE TELECOMMUNICATIONS INDUSTRY MAY LIMIT THE DEVELOPMENT OF OUR
  NETWORKS AND AFFECT OUR COMPETITIVE POSITION

    Existing and future government laws and regulations may influence how we
operate our business, our business strategy and ultimately, our viability. U.S.
Federal and state telecommunications laws and the laws of foreign countries in
which we operate directly shape the telecommunications market. Consequently,
regulatory requirements and/or changes could adversely affect our operations and
also influence the market for Internet, web hosting and related services.
However, we cannot predict the future regulatory framework of our business.

    U.S. LAWS MAY IMPACT OUR BUSINESS AND RESULTS OF OPERATIONS BY REGULATING
     OUR OPERATIONS AND OUR CUSTOMERS' OPERATIONS

    U.S. Federal telecommunications law imposes legal requirements on common
carriers who engage in interstate or foreign communication by wire or radio, and
on telecommunications carriers. Should these regulations be applied to us, they
may have a material adverse impact on our business and results of operation. If
providing dark fiber facilities or related services provided by us were deemed
to be a telecommunications service, then regulations, both Federal and state,
applicable to telecommunications carriers might apply to us. This could subject
the revenues we received from facility leases in interstate commerce to
assessment by the Federal Communications Commission Universal Service Fund and
the offering of those facilities or services would be subject to common carrier
regulation. In addition, our customers and, in the case of Bell Atlantic, one of
our potential shareholders, are local exchange carriers or long distance
carriers, subject to regulation by Federal Communications Commission. Our
business may be affected by regulations applicable to these telecommunications
carriers. For example, the Federal Communications Commission has recently taken
steps, and may take further steps, to reduce the access charges, the fees paid
by long distance carriers to local exchange carriers for originating and
terminating long distance calls on the incumbent local exchange carriers' local
networks, and to give the local exchange carriers greater flexibility in setting
these charges. While we cannot predict the precise effect reduction in access
charge will have on our operations, the reduction will likely make it more
attractive for long distance carriers to use local exchange carriers facilities,
rather than our fiber optic telecommunications network. A recent decision by the
Federal Communications Commission to require unbundling of incumbent local
exchange carriers' dark fiber could decrease the demand for our dark fiber by
allowing our potential customers to obtain dark fiber from incumbent local
exchange carriers at cost-based rates, and thereby have an adverse effect on the
results of our operations.

    STATES LEGISLATION AFFECTS OUR PRICING POLICIES AND OUR COSTS

    Our offering of transmission services, which is different from dark fiber
capacity, may be subject to regulation in each state to the extent that these
services are offered for intrastate use, and this regulation may have an adverse
effect on the results of our operations. We cannot assure you that these
regulations, if any, as well as future regulatory, judicial, or legislative
action will not have a material adverse effect on us. In particular, state
regulators have the authority to determine both the rates we will pay to
incumbent local

                                      S-18
<PAGE>
exchange carriers for certain interconnection arrangements such as physical
collocation, and the prices that incumbent local exchange carriers will be able
to charge our potential customers for services and facilities that compete with
our services. We will also incur costs in order to comply with regulatory
requirements such as the filing of tariffs, submission of periodic financial and
operational reports to regulators, and payment of regulatory fees and
assessments, including contributions to state universal service funds. In some
jurisdictions, our pricing flexibility for intrastate services may be limited
because of regulation, although our direct competitors will be subject to
similar restrictions.

    LOCAL GOVERNMENTS' CONTROL OVER RIGHTS-OF-WAY CAN LIMIT THE DEVELOPMENT OF
     OUR NETWORKS

    Local governments exercise legal authority that may have an adverse effect
on our business because of our need to obtain rights-of-way for our fiber
network. While local governments may not prohibit persons from providing
telecommunications services nor treat telecommunication service providers in a
discriminatory manner, they can affect the timing and costs associated with our
use of public rights-of-way.

    THE REGULATORY FRAMEWORK FOR OUR INTERNATIONAL OPERATIONS IS EXTENSIVE AND
     CONSTANTLY CHANGING, ADDING UNCERTAINTIES TO OUR PLANNED EXPANSION INTO
     FOREIGN COUNTRIES

    Various regulatory requirements and limitations also will influence our
business as we attempt to enter international markets. Regulation of the
international telecommunications industry is changing rapidly. We are unable to
predict how the Federal Communications Commission and foreign regulatory bodies
will resolve the various pending international policy issues and the effect of
such resolutions on us. Our US/UK undersea cable joint venture is a U.S.
international common carrier subject to U.S. regulation under Title II of the
Communications Act of 1934. We are also licensed as a U.S. international common
carrier subject to U.S. regulation under Title II of the Communications Act of
1934. Our U.K. joint venture is, and we also are, required, under Sections 214
and 203 of the Communications Act of 1934, respectively, to obtain authorization
and file an international service tariff containing rates, terms and conditions
before initiating service. International carriers are also subject to certain
annual fees and filing requirements such as the requirement to file contracts
with other carriers, including foreign carrier agreements, and reports
describing international circuit, traffic and revenue data service. So long as
our U.K. joint venture and we operate as international common carriers, they
will also be required to comply with the rules of the Federal Communications
Commission. The international services provided by our U.K. joint venture are
and our international services are also subject to regulation in the United
Kingdom and other European jurisdictions in which we may operate. National
regulations of relevant European and other foreign countries, as well as
policies and regulations on the European Union and other foreign governmental
level, impose separate licensing, service and other conditions on our foreign
joint ventures and our international service operations, and these requirements
may have a material adverse impact on us.

OUR FRANCHISES, LICENSES OR PERMITS COULD BE CANCELED OR NOT RENEWED, WHICH
  WOULD IMPAIR THE DEVELOPMENT OF MAJOR MARKETS FOR OUR SERVICES

    Termination or non-renewal of our franchise with the city of New York or of
certain other rights-of-way or franchises that we use for our networks would
have a material adverse effect on our business, results of operations and
financial condition. We will also need to obtain additional franchises, licenses
and permits for our planned intracity networks, intercity networks and
international networks. We cannot assure you that we will be able to maintain on
acceptable terms our existing franchises, licenses or permits or to obtain and
maintain the other franchises, licenses or permits needed to implement our
strategy.

                                      S-19
<PAGE>
WE MAY NOT BE ABLE TO OBTAIN AND MAINTAIN THE RIGHTS-OF-WAY AND OTHER PERMITS
  NECESSARY TO IMPLEMENT OUR BUSINESS STRATEGY

    We must obtain additional rights-of-way and other permits from railroads,
utilities, state highway authorities, local governments and transit authorities
to install underground conduit for the expansion of our intracity networks,
intercity networks and international networks. We cannot assure you that we will
be successful in obtaining and maintaining these right-of-way agreements or
obtaining these agreements on acceptable terms. Some of these agreements may be
short-term or revocable at will, and we cannot assure you that we will continue
to have access to existing rights-of-way after they have expired or terminated.
If any of these agreements were terminated or could not be renewed and we were
forced to remove our fiberoptic cable from under the streets or abandon our
networks, the termination could have a material adverse effect on our
operations. In addition, landowners have asserted that railroad companies and
others to whom they granted easements to their properties are not entitled as a
result of these easements to grant rights of way to telecommunications
providers. If these disputes are resolved in the landowners' favor, we could be
obligated to make substantial lease payments to these landowners for the lease
of these rights of way. More specifically, our New York/New Jersey network
relies upon, and our planned expansions into Long Island and Westchester County
will rely upon, right-of-way agreements with Bell Atlantic Corporation and our
subsidiary, Empire City Subway Company (Ltd.). The current agreements may be
terminated at any time without cause with three months notice. In case of
termination, we may be required to remove our fiber optic cable from the
conduits or poles of Bell Atlantic. This termination would have a material
adverse effect on our operations.

RAPID TECHNOLOGICAL CHANGES COULD AFFECT THE CONTINUED USE OF FIBER OPTIC CABLE
  AND OUR RESULTS OF OPERATIONS

    The telecommunications industry is subject to rapid and significant changes
in technology that could materially affect the continued use of our services,
including our fiber optic cable and Internet connectivity services. We cannot
predict the effect of technological changes on our business. We also cannot
assure you that technological changes in the communications industry and
Internet-related industry will not have a material adverse effect on our
operations.

WE MAY EXPERIENCE RISKS AS A RESULT OF EXPANDING OUR NETWORKS INTO EUROPEAN AND
  OTHER FOREIGN COUNTRIES, WHICH MAY ADVERSELY AFFECT OUR RESULTS OF OPERATIONS

    Our strategy includes expanding our services to provide fiber optic cable
and developing regional Internet services exchange facilities in Europe,
particularly Austria, Germany and the United Kingdom. The following are risks we
may experience as a result of doing business in Germany, the United Kingdom and
other foreign countries in which we may expand our networks:

    - difficulties in staffing and managing our operations in foreign countries;

    - longer payment cycles;

    - problems in collecting accounts receivable;

    - fluctuations in currency exchange rates;

    - delays from customs brokers or government agencies encountered as a result
      of exporting fiber from the United States to Germany, the United Kingdom
      or other countries in which we may operate; and

    - potentially adverse consequences resulting from operating in multiple
      countries such as Germany and the United Kingdom, each with their own laws
      and regulations, including tax laws and industry related regulations.

                                      S-20
<PAGE>
    We cannot assure you that we will be successful in overcoming these risks or
any other problems arising because of expansion into Europe and other foreign
countries.

WE MAY NOT BE ABLE TO SUCCESSFULLY IDENTIFY, MANAGE AND ASSIMILATE FUTURE
  ACQUISITIONS, INVESTMENTS AND STRATEGIC ALLIANCES, WHICH WOULD ADVERSELY
  AFFECT OUR RESULTS OF OPERATIONS

    We have in the past, and may in the future, acquire, make investments in, or
enter into strategic alliances, including joint ventures in which we hold less
than a majority interest, with companies which have customer bases, switching
capabilities, existing networks or other assets in our current markets or in
areas into which we intend to expand our networks. Any acquisitions,
investments, strategic alliances or related efforts will be accompanied by risks
such as:

    - the difficulty of identifying appropriate acquisition candidates;

    - the difficulty of assimilating the operations of the respective entities;

    - the potential disruption of our ongoing business;

    - the potential inability to control joint ventures in which we hold less
      than a majority interest;

    - the inability of management to capitalize on the opportunities presented
      by acquisitions, investments, strategic alliances or related efforts;

    - the failure to successfully incorporate licensed or acquired technology
      and rights into our services,

    - the inability to maintain uniform standards, controls, procedures and
      policies, and

    - the impairment of relationships with employees and customers as a result
      of changes in management.

    We cannot assure you that we would be successful in overcoming these risks
or any other problems encountered with such acquisitions, investments, strategic
alliances or related efforts.

IN THE TELECOMMUNICATIONS INDUSTRY, CONTINUED PRICING PRESSURES FROM OUR
  COMPETITORS AND AN EXCESS OF NETWORK CAPACITY CONTINUE TO CAUSE PRICES FOR OUR
  SERVICES TO DECLINE

    We anticipate that prices for our services specifically, and transmission
services in general, will continue to decline over the next several years due
primarily to the following:

    - price competition as various network providers continue to install
      networks that might compete with our networks,

    - recent technological advances that permit substantial increases in the
      transmission capacity of both new and existing fiber, and

    - strategic alliances or similar transactions, such as long distance
      capacity purchasing alliances among regional Bell operating companies,
      that increase the parties' purchasing power.

                                      S-21
<PAGE>
WE MAY EXPERIENCE ADDITIONAL RISKS AS A RESULT OF ABOVENET'S CO-LOCATION AND
  INTERNET CONNECTIVITY SERVICES

    The legal landscape that governs AboveNet has yet to be interpreted or
enforced. Regulatory issues for AboveNet's industry include property ownership,
copyrights and other intellectual property issues, taxation, libel, obscenity
and personal privacy. AboveNet's business may be adversely affected by the
adoption and interpretation of any future or currently existing laws and
regulations. AboveNet has no patented technology and relies on a combination of
copyright, trademark, service mark and trade secret laws and contractual
restrictions to establish and protect certain proprietary rights in its
technology. AboveNet's business may be adversely affected by a claim that it is
infringing the proprietary rights of others.

    Despite AboveNet's design and implementation of a variety of network
security measures, unauthorized access, computer viruses, accidental or
intentional action and other disruptions could occur. In addition, we may incur
significant costs to prevent breaches in AboveNet's security or to alleviate
problems caused by those breaches. The law relating to the liability of online
services companies and Internet access providers of information carried on or
disseminated through their networks is currently unsettled. It is possible that
claims could be made against online services companies, co-location companies
and Internet access providers. We may need to implement measures to reduce our
exposure to this potential liability which may require the expenditure of
substantial resources. The increased attention focused upon liability issues as
a result of lawsuits, new laws and legislative proposal could impede the growth
of Internet use.

    In addition, some of AboveNet's customers have sent unsolicited commercial
E-mails from servers co-located at its facilities to massive numbers of people.
This practice known as "spamming" can lead to complaints against service
providers that enable such activities, such as AboveNet. In addition,
legislation has recently been passed that prohibits "spamming."

ABOVENET DEPENDS ON THE GROWTH AND PERFORMANCE OF THE INTERNET

    AboveNet's success will depend in large part on growth in the use of the
Internet. Growth of the Internet depends on many factors, including security,
reliability, cost, ease of access, quality of service and bandwidth. The recent
growth of the Internet has placed strain on the Internet, necessitating upgrades
to its infrastructure. Any perceived or actual weakening in the performance of
the Internet could undermine AboveNet's services, which are dependent on third
parties. AboveNet's ability to attract new customers similarly depends on a
variety of factors, including the ability to provide continuous service. In
addition, AboveNet's customers might terminate or decide not to renew
commitments to use its services. AboveNet must continue to expand and adapt its
network infrastructure as the number of its users grows, as its users place
increasing demands on it, and as requirements change.

OUR BUSINESS DEPENDS ON A LIMITED NUMBER OF KEY PERSONNEL THE LOSS OF WHOM COULD
  ADVERSELY AFFECT OUR BUSINESS.

    Our business is managed by a small number of key management and operating
personnel. We believe that the success of our business strategy and our ability
to operate profitably depend on the continued employment of our senior
management team led by Stephen A. Garofalo, Chief Executive Officer and Chairman
of the Board of Directors. Our business and financial results could be
materially affected if Mr. Garofalo or other members of our senior management
team became unable or unwilling to continue in their present positions.

METROMEDIA COMPANY EFFECTIVELY CONTROLS OUR COMPANY AND HAS THE POWER TO CAUSE
  OR PREVENT A CHANGE OF CONTROL

    Metromedia Company and one of its general partners currently own 100% of our
class B common stock, which currently represents approximately 63% of the total
voting power and also is entitled to elect

                                      S-22
<PAGE>
75% of the members of our board of directors. Accordingly, Metromedia Company is
able to control the board of directors and all stockholder decisions and, in
general, to determine the outcome of any corporate transaction or other matter
submitted to the stockholders for approval, including mergers, consolidations
and the sale of all or substantially all of our assets, without the consent of
our other stockholders. In addition, Metromedia Company has the power to prevent
or cause a change in control of our company.

WE ARE INVOLVED IN A LEGAL PROCEEDING WHICH COULD ADVERSELY AFFECT OUR FINANCIAL
  CONDITION

    We are involved in a legal proceeding in connection with the sale of 900,000
shares (not adjusted for stock splits) of our class A common stock. Please refer
to the section in this prospectus supplement entitled "Business--Legal
Proceedings."

    If we are unsuccessful in defending against the allegations made in this
proceeding, an award of the magnitude being sought in this legal proceeding
could have a material adverse effect on our financial condition and results of
operations. We intend to vigorously defend this action because we believe that
we acted appropriately in connection with the matters at issue in this case.
However, we cannot assure you that we will not determine that the advantages of
entering into a settlement outweigh the risk and expense of protracted
litigation or that ultimately we will be successful in defending against these
allegations.

FAILURES TO ADDRESS THE YEAR 2000 PROBLEM MAY CAUSE DISRUPTIONS IN THE OPERATION
  OF OUR NETWORKS AND OUR SERVICES TO CUSTOMERS

    Many computer systems and software products will not function properly in
the year 2000 and beyond due to a once-common programming standard that
represents years using two digits. This problem is often referred to as the year
2000 problem. It is possible that our currently installed computer systems,
software products or other information technology systems, including imbedded
technology, or those of our suppliers, contractors, or major systems developers
working either alone or in conjunction with other softwares or systems, will not
properly function in the year 2000 because of the year 2000 problem. If we or
our customers, suppliers, contractors, and major systems developers are unable
to address their year 2000 issues in a timely manner, a material adverse effect
on our results of operations and financial condition could result. We are
currently working to evaluate and resolve the potential impact of the year 2000
on our processing of date-sensitive information and network systems. We have
contacted all our significant suppliers, contractors and major systems
developers to determine our vulnerability to their year 2000 situations. We
cannot assure you that the year 2000 problem will only have a minimal cost
impact or that other companies will convert their systems on a timely basis and
that their failure will not have an adverse effect on our systems.

RISK FACTORS RELATING TO THE NOTES

WE ARE A HOLDING COMPANY AND WILL BE DEPENDENT ON THE CASH FLOWS OF OUR
  SUBSIDIARIES TO MEET OUR OBLIGATIONS

    We are a holding company with little direct operations and little assets of
significance other than the stock of our subsidiaries. As such, we will be
dependent on the cash flows of our subsidiaries to meet our obligations,
including the payment of principal and interest on the notes. Our subsidiaries
are separate legal entities that will have no obligation to pay any amounts due
under the notes or to make any funds available therefor, whether by dividends,
loans or other payments. Our subsidiaries will not guarantee the payment of the
notes. The notes will therefore be effectively subordinated to the claims of the
creditors of our subsidiaries (including trade creditors and holders of
indebtedness of such subsidiaries). We expect that our current and future
subsidiaries will incur significant amounts of equipment financing and other
indebtedness in connection with the development of our networks. Please refer to
the sections in this prospectus supplement entitled "Management's Discussion and
Analysis of Financial Condition and Results of Operations--Liquidity and Capital
Resources," "Business" and "Description of the Notes."

                                      S-23
<PAGE>
THE NOTES WILL BE SUBORDINATED TO ALL OF OUR EXISTING AND FUTURE SECURED AND
  SUBSIDIARIES' DEBT

    The notes are unsecured and therefore will be effectively subordinated to
all our existing and future secured indebtedness to the extent of the value of
the assets securing such indebtedness and to all of our foreign subsidiaries'
existing or future Indebtedness, whether or not secured. The indenture will
permit us and our subsidiaries to incur an unlimited amount of secured
indebtedness to finance the engineering, construction, installation,
acquisition, lease, development or improvement of telecommunications assets.
Please refer to the section of this prospectus supplement entitled "Description
of the Notes." Consequently, in the event of a bankruptcy, liquidation,
dissolution, reorganization or similar proceeding of our company, our assets
will be available to satisfy obligations of such secured debt before any payment
may be made on the notes. In addition, to the extent such assets cannot satisfy
in full the secured indebtedness, the holders of such indebtedness would have a
claim for any shortfall that would rank equally in right of payment (or
effectively senior if the indebtedness were issued by a subsidiary) with the
notes. Accordingly, there might only be a limited amount of assets available to
satisfy your claims as a holder of the notes upon an acceleration of the
maturity of the notes.

THERE IS NO PUBLIC MARKET FOR THE NOTES

    The Dollar notes and the Euro notes will be new securities for which
currently there is no trading market. Application has been made to list the
Dollar notes and the Euro notes on the Luxembourg Stock Exchange. There is no
assurance, however, that the notes will qualify for listing on the Luxembourg
Stock Exchange. The underwriters have informed us that they currently intend to
make a market in the Dollar notes and the Euro notes. However, the underwriters
are not obligated to do so and may discontinue any such market making at any
time without notice. The liquidity of any market for the Dollar notes and the
Euro notes will depend upon the number of holders of the Dollar notes and the
Euro notes, the interest of securities dealers in making a market for the Dollar
notes and the Euro notes and other factors. Accordingly, we cannot assure you
that a market or liquidity will develop for the Dollar notes and the Euro notes.

    Historically, the market for non-investment grade debt has been subject to
disruptions that have caused substantial volatility in the prices of securities
similar to the notes. We cannot assure you that the market for the notes, if
any, will not be subject to similar disruptions. Any such disruptions may
adversely affect you as a holder of the notes.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

    Some of the statements contained in this prospectus supplement under the
sections entitled "Summary," "Risk Factors," "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and "Business" are
forward-looking statements within the meaning of Section 27A of the Securities
Act of 1933 and Section 21E of the Securities Exchange Act of 1934. They include
statements about our expectations, beliefs, plans, objectives, assumptions or
future events or performance. These statements are often, but not always, made
through the use of words or phrases such as "will likely result," "expect,"
"will continue," "anticipate," "estimate," "intends," "plan," "projection,"
"would," and "outlook." These forward-looking statements are based on our
expectations and are subject to a number of risks and uncertainties. Certain of
these risks and uncertainties are beyond our control. In this prospectus
supplement, we have described our current network and our anticipated program of
network expansion. However, there is no assurance that we will be able to
implement our proposed business strategy. Our actual results may differ
materially from those suggested by these forward-looking statements for various
reasons, including those discussed under the sections entitled "Risk Factors,"
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and "Business." Some of the key factors that have a direct bearing
on our results of operations are:

    - general economic and business conditions;

    - competition in the telecommunications industry;

                                      S-24
<PAGE>
    - industry capacity;

    - success of acquisitions and operating initiatives, including our ability
      to successfully integrate our acquisitions;

    - management of growth;

    - dependence on senior management;

    - brand awareness;

    - general risks of the telecommunications industries;

    - development risks;

    - risks relating to the availability of financing;

    - the existence or absence of adverse publicity;

    - changes in business strategy or development plans;

    - availability, terms and deployment of capital;

    - business abilities and judgment of personnel;

    - availability of qualified personnel;

    - labor and employee benefit costs;

    - changes in, or failure to comply with, government regulations;

    - construction schedules;

    - costs and other effects of legal and administrative proceedings;

    - changes in marketing and technology; and

    - changes in political, social and economic conditions, especially with
      respect to our foreign operations, and other factors referenced in this
      prospectus supplement.

    These factors and the risk factors referred to above could cause actual
results or outcomes to differ materially from those expressed in any
forward-looking statements made by us. You should not place undue reliance on
any such forward-looking statements. Further, any forward-looking statement
speaks only as of the date on which it is made and we undertake no obligation to
update any forward-looking statement or statements to reflect events or
circumstances after the date on which such statement is made or to reflect the
occurrence of unanticipated events. New factors emerge from time to time, and it
is not possible for us to predict which will arise. In addition, we cannot
assess the impact of each factor on our business or the extent to which any
factor, or combination of factors, may cause actual results to differ materially
from those contained in any forward-looking statements.

    For a discussion of important risks of an investment in our securities,
including factors that could cause actual results to differ materially from
results referred to in the forward-looking statements, see "Risk Factors." You
should carefully consider the information set forth under the caption "Risk
Factors." In light of these risks, uncertainties and assumptions, the
forward-looking events discussed in or incorporated by reference in this
prospectus supplement might not occur.

                                      S-25
<PAGE>
                                USE OF PROCEEDS

    We estimate that we will receive approximately $975.3 million in net
proceeds from the sale of the notes in the offering, after we deduct the
underwriters' discounts and commissions and an estimated $1.0 million in
expenses payable by us. We intend to use the net proceeds of the offering for
the build-out of our intra-city and inter-city networks in the United States and
Europe and for other capital expenditures, including possible acquisitions of
other companies or assets. We currently intend to allocate substantial proceeds
to each of these uses. Please refer to the section in this prospectus supplement
entitled "Management's Discussion and Analysis of Financial Condition and
Results of Operations--Liquidity and Capital Resources."

    Pending application of the net proceeds of the offering of the notes, we
will place the net proceeds in interest bearing bank accounts or invest the net
proceeds in United States government securities or other short-term, interest
bearing, investment grade securities.

                                      S-26
<PAGE>
                                 CAPITALIZATION

    The following table shows our capitalization as of September 30, 1999:

    - on a historical basis;

    - on a pro forma basis to reflect the offering of the notes sold by us, as
      if it had been consummated on September 30, 1999; and

    - on a pro forma basis to reflect the offering of the notes and the purchase
      by Bell Atlantic of shares of our class A common stock and the convertible
      subordinated note, which has not yet been consummated and is subject to
      customary closing conditions, as if they had been consummated on
      September 30, 1999.

    You should read this table together with the consolidated financial
statements and related notes of our company, AboveNet and Palo Alto Internet
Exchange included in this prospectus supplement beginning on page F-1 and the
information in the sections entitled "Risk Factors--Failure to Consummate the
Bell Atlantic Transactions May Cause Us to Seek Alternative Financing,"
"Unaudited Pro Forma Condensed Combining Financial Information" and
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources."

<TABLE>
<CAPTION>
                                                                      AS OF SEPTEMBER 30, 1999
                                                           ----------------------------------------------
                                                                                            PRO FORMA FOR
                                                                            PRO FORMA       BELL ATLANTIC
                                                             ACTUAL      FOR THE OFFERING    INVESTMENT
                                                           -----------   ----------------   -------------
                                                                           (IN THOUSANDS)
<S>                                                        <C>           <C>                <C>
Cash and cash equivalents................................  $   352,900      $1,328,187       $3,019,095
                                                           ===========      ==========       ==========
Pledged securities (1)...................................  $    63,864      $   63,864       $   63,864
                                                           ===========      ==========       ==========
Debt:
  Capital lease obligations less current portion.........  $    24,316      $   24,316       $   24,316
  10% Senior Notes due 2008..............................      650,000         650,000          650,000
  Senior Notes due 2009 offered by this prospectus
    supplement...........................................           --       1,002,823        1,002,823
  6.15% Convertible Subordinated Note to be issued to
    Bell Atlantic........................................           --              --          975,281
  Other less current portion.............................       14,720          14,720           14,720
                                                           -----------      ----------       ----------
  Total debt.............................................      689,036       1,691,859        2,667,140
                                                           -----------      ----------       ----------
Stockholders' equity
    Class A common stock, $.01 par value; 2,404,031,241
      shares authorized; 198,822,053 shares issued and
      outstanding, actual and pro forma for the offering;
      224,377,162 shares issued and outstanding, pro
      forma for Bell Atlantic investment.................        1,988           1,988            2,244
    Class B common stock, $.01 par value; 522,254,782
      shares authorized; 33,769,272 shares issued and
      outstanding, actual, pro forma for the offering and
      pro forma for Bell Atlantic investment.............          338             338              338
Additional paid-in capital...............................    2,065,316       2,065,316        2,780,687
Accumulated deficit......................................      (86,526)        (86,526)         (86,526)
Cumulative comprehensive loss............................       (1,123)         (1,123)          (1,123)
                                                           -----------      ----------       ----------
      Total stockholders' equity.........................    1,979,993       1,979,993        2,695,620
                                                           -----------      ----------       ----------
Total capitalization.....................................  $ 2,669,029      $3,671,852       $5,362,760
                                                           ===========      ==========       ==========
</TABLE>

- ------------------------

(1) Represents amounts deposited with the security agent pursuant to a security
    agreement to make payments of interest through May 15, 2000 on our 10%
    Senior Notes due 2008.

Note: There has been no material change in our capitalization since
September 30, 1999.

                                      S-27
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA

    Our selected consolidated financial data presented below and for the years
ended December 31, 1996, 1997 and 1998 have been derived from our consolidated
financial statements and the related notes included in this prospectus
supplement beginning on page F-1. Our consolidated financial statements as of
and for the years ended December 31, 1996, 1997 and 1998 have been audited by
Ernst & Young LLP, independent auditors. The selected financial data presented
below as of and for the years ended December 31, 1994 and 1995 have been derived
from our audited financial statements which are not included in this prospectus
supplement. The selected consolidated financial data and balance sheet data as
of and for the nine months ended September 30, 1999 and the selected
consolidated financial data for the nine months ended September 30, 1998 have
been derived from our unaudited consolidated financial statements, which we
believe include all adjustments necessary for a fair presentation of the
financial condition and results of operations for such periods. The results of
operations for interim periods are not necessarily indicative of the results for
a full year's operations.

    The selected unaudited pro forma balance sheet as of September 30, 1999
gives pro forma effect to the following transactions:

    - the offering of the notes, as if it had been consummated on September 30,
      1999; and

    - the offering of the notes and the purchase by Bell Atlantic of shares of
      our class A common stock and the convertible subordinated note, which
      purchase has not yet been consummated and is subject to customary closing
      conditions, as if they had been consummated on September 30, 1999.

    The pro forma adjustments are based upon available information and
assumptions that we believe are reasonable at the time made. The selected
unaudited pro forma balance sheet data does not purport to present our financial
position had the transactions occurred on the dates specified, nor are they
necessarily indicative of the financial position that may be achieved in the
future.

    As you read the selected consolidated financial data, please refer to the
following: "Risk Factors--Failure to Consummate the Bell Atlantic Transactions
Cause Us to Seek Alternative Financing," "Unaudited Pro Forma Condensed
Combining Financial Information," "Capitalization," "Management's Discussion and
Analysis of Financial Condition and Results of Operations," "Business," the
consolidated

                                      S-28
<PAGE>
financial statements and the related notes of our company, AboveNet and Palo
Alto Internet Exchange and the other financial data appearing in this prospectus
supplement.

<TABLE>
<CAPTION>
                                                                      YEAR ENDED                               NINE MONTHS
                                                                     DECEMBER 31,                          ENDED SEPTEMBER 30,
                                                 ----------------------------------------------------   -------------------------
                                                   1994       1995       1996       1997       1998        1998          1999
                                                 --------   --------   --------   --------   --------   -----------   -----------
                                                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                              <C>        <C>        <C>        <C>        <C>        <C>           <C>
STATEMENT OF OPERATIONS DATA:
Revenue........................................  $    --    $    56    $    236   $  2,524   $ 36,436     $20,840      $ 49,397
Expenses:
  Cost of sales................................       --         --         699      3,572     13,937       9,499        24,414
  Selling, general and administrative..........      874      3,886       2,070      6,303     14,712       9,811        27,369
  Depreciation and amortization................       --        162         613        757      1,532         738        15,645
  Consulting and employment incentives.........       --         --       3,652     19,218      3,648       3,648            --
                                                 -------    -------    --------   --------   --------     -------      --------
(Loss) Income from operations..................     (874)    (3,992)     (6,798)   (27,326)     2,607      (2,856)      (18,031)
Interest income (expense), net.................       --       (327)     (3,561)     1,067      1,927       5,012       (25,784)
(Loss) from joint venture......................       --         --          --         --       (146)       (264)         (475)
Income taxes...................................       --         --          --         --      3,402         825            --
                                                 -------    -------    --------   --------   --------     -------      --------
Net (loss) income..............................  $  (874)   $(4,319)   $(10,359)  $(26,259)  $    986     $ 1,067      $(44,290)
                                                 =======    =======    ========   ========   ========     =======      ========
Net (loss) income applicable to common
 stockholders per share........................  $ (0.02)   $ (0.09)   $  (0.14)  $  (0.28)  $   0.01     $  0.01      $  (0.23)
                                                 =======    =======    ========   ========   ========     =======      ========
Weighted average number of shares
 outstanding...................................   46,672     49,658      71,716     94,894    186,990     186,392       190,639
                                                 =======    =======    ========   ========   ========     =======      ========
Ratio of earnings to fixed charges (1).........       --         --          --         --       1.61        9.95            --
EBITDA (2).....................................  $  (874)   $(3,830)   $ (6,185)  $(26,569)  $  3,993     $(3,207)     $ (2,861)
Adjusted EBITDA (2)............................  $  (874)   $(3,830)   $ (2,533)  $ (7,351)  $  7,641     $   441      $ (2,861)
</TABLE>

<TABLE>
<CAPTION>
                                                                        AS OF SEPTEMBER 30, 1999
                                                              ---------------------------------------------
                                                                                              PRO FORMA FOR
                                                                              PRO FORMA FOR   BELL ATLANTIC
                                                                 ACTUAL       THE OFFERING     INVESTMENT
                                                              -------------   -------------   -------------
                                                                             (IN THOUSANDS)
<S>                                                           <C>             <C>             <C>
BALANCE SHEET DATA:
Cash and cash equivalents...................................   $  352,900      $1,328,187      $3,019,095
Pledged securities (3)......................................       63,864          63,864          63,864
Property and equipment, net.................................      564,798         564,798         564,798
Total assets................................................    2,918,401       3,921,224       5,612,132
Long-term debt..............................................      689,036       1,691,859       2,667,140
Total liabilities...........................................      938,408       1,941,231       2,916,512
Stockholders' equity........................................    1,979,993       1,979,993       2,695,620
</TABLE>

(1) Earnings were insufficient to cover fixed charges in the years ended
    December 31, 1994, 1995, 1996 and 1997 and for the nine months ended
    September 30, 1999. The deficiency was $874,000, $4,319,000, $10,359,000,
    $26,259,000 and $44,290,000 for the periods ended December 31, 1994, 1995,
    1996, and 1997 and for the nine months ended September 30, 1999,
    respectively.

(2) "EBITDA" consists of earnings (loss) before income taxes plus all net
    interest expense and all depreciation and amortization expense. "Adjusted
    EBITDA" consists of earnings (loss) before income taxes plus all net
    interest expense, depreciation and amortization and non cash employment and
    consulting incentives and settlements. You should not think of EBITDA and
    Adjusted EBITDA as alternative measures of operating results or cash flows
    from operating activities (as determined in accordance with generally
    accepted accounting principles). We have included EBITDA and Adjusted EBITDA
    because they are widely used financial measures of the potential capacity of
    a company to incur and service debt. Our reported EBITDA and Adjusted EBITDA
    may not be comparable to similarly titled measures used by other companies.

(3) Represents amounts deposited with the security agent pursuant to a security
    agreement to make payments of interest through May 15, 2000 on our 10%
    Senior Notes due 2008.

                                      S-29
<PAGE>
         UNAUDITED PRO FORMA CONDENSED COMBINING FINANCIAL INFORMATION

    The following unaudited pro forma condensed combining financial information
illustrates the effect of the merger of AboveNet with our wholly-owned
subsidiary under the terms of the merger agreement, dated June 22, 1999. Under
the terms of the merger agreement, the holders of AboveNet common stock received
1.175 shares of our class A common stock for each share of AboveNet common
stock. The share price used to determine the acquisition cost was derived from
taking the average of the closing price of our class A common stock for the two
days prior to and subsequent to the announcement of the proposed merger, which
was June 23, 1999.

    On June 21, 1999, AboveNet acquired the assets and assumed obligations
related to the Palo Alto Internet Exchange from Compaq Computer Corporation
("Compaq") for approximately $76.5 million, consisting of $70 million in cash,
an obligation to provide various services to Compaq with a value currently
estimated to be approximately $5 million and expenses of approximately
$1.5 million.

    The unaudited pro forma condensed combining financial information presented
herein gives effect to our acquisition of AboveNet and AboveNet's acquisition of
Palo Alto Internet Exchange. The unaudited pro forma condensed combining
financial information is based on the historical financial statements of
Metromedia, AboveNet and Palo Alto Internet Exchange.

    AboveNet had a fiscal year end of June 30. The unaudited historical
financial information for AboveNet for the year ended December 31, 1998 consists
of the period from January 1, 1998 to June 30, 1998 combined with the period
from July 1, 1998 to December 31, 1998 derived from AboveNet's historical
unaudited financial statements.

    The unaudited pro forma condensed combining statements of operations for the
nine months ended September 30, 1999 and for the year ended December 31, 1998
give effect to the above transactions as if they had been consummated on
January 1, 1998.

ACCOUNTING TREATMENT

    We plan to record the acquisition of AboveNet using the purchase method of
accounting. Accordingly, the assets acquired and liabilities assumed will be
recorded at their estimated fair values, which are subject to further adjustment
based upon appraisals and other analyses.

    AboveNet recorded the acquisition of Palo Alto Internet Exchange using the
purchase method of accounting. Accordingly, the assets acquired and obligations
assumed have been recorded at their estimated fair values, which are subject to
further adjustments based upon appraisals and other analyses.

    The pro forma adjustments are based upon available information and
assumptions that we believe are reasonable at the time made. The unaudited pro
forma condensed combining financial statements do not purport to present our
financial position or results of operations had the acquisitions occurred on the
dates specified, nor are they necessarily indicative of the financial position
or results of operations that may be achieved in the future. The unaudited pro
forma condensed combining statements of operations do not reflect any
adjustments for synergies that we expect to realize following consummation of
the acquisitions. No assurances can be made as to the amount of cost savings or
revenue enhancements, if any, that may be realized.

    The unaudited pro forma condensed combining financial statements should be
read in conjunction with the consolidated financial statements and notes of our
company, AboveNet and Palo Alto Internet Exchange.

                                      S-30
<PAGE>
                         METROMEDIA FIBER NETWORK, INC.

             PRO FORMA CONDENSED COMBINING STATEMENTS OF OPERATIONS

                                  (UNAUDITED)

                  FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1999

                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                                   METROMEDIA                   METROMEDIA
                         ABOVENET       PAIX(2)                        PRO FORMA     FIBER                        FIBER
                       HISTORICAL(1)   HISTORICAL   ADJUSTMENTS        ABOVENET    HISTORICAL   ADJUSTMENTS     PRO FORMA
                       -------------   ----------   -----------        ---------   ----------   -----------     ----------
<S>                    <C>             <C>          <C>                <C>         <C>          <C>             <C>
Revenue..............     $ 18,073       $3,171       $    --          $ 21,244     $ 49,397      $     --      $  70,641
Expenses:
Cost of sales........       24,132        2,013          (206)(3)        25,939       24,414            --         50,353
Selling, general and
  administrative.....       21,810          301            --            22,111       27,369        (2,869)(4)     46,611
Consulting and
  employment
  incentives.........          654           --            --               654           --            --            654
Depreciation and                                        5,228 (5)                                   (5,228)(6)
  amortization.......        5,006        1,696        (1,490)(3)(5)     10,440       15,645        56,538 (7)     77,395
                          --------       ------       -------          --------     --------      --------      ---------
Income (loss) from
  operations.........      (33,529)        (839)       (3,532)          (37,900)     (18,031)      (48,441)      (104,372)
Other income
  (expense):
Interest income......        4,679           --            --             4,679       19,127            --         23,806
Interest expense.....       (1,780)          --            --            (1,780)     (44,911)           --        (46,691)
Loss in joint
  venture............         (397)          --            --              (397)        (475)           --           (872)
                          --------       ------       -------          --------     --------      --------      ---------
Net loss before
  income taxes.......      (31,027)        (839)       (3,532)          (35,398)     (44,290)      (48,441)      (128,129)
Income taxes.........           --           --            --                --           --            --             --
                          --------       ------       -------          --------     --------      --------      ---------
Net loss.............     $(31,027)      $ (839)      $(3,532)         $(35,398)    $(44,290)     $(48,441)     $(128,129)
                          ========       ======       =======          ========     ========      ========      =========
Net loss per
  share--basic.......                                                               $  (0.23)                   $   (0.55)
                                                                                    ========                    =========
Net loss per
  share--diluted.....                                                                    n/a                          n/a
                                                                                    ========                    =========
Weighted average
  number of shares
  outstanding--
  basic (8)..........                                                                190,639                      230,920
                                                                                    ========                    =========
Weighted average
  number of shares
  outstanding--
  diluted............                                                                    n/a                          n/a
                                                                                    ========                    =========
</TABLE>

                   (SEE THE ACCOMPANYING NOTES ON PAGE S-33)

                                      S-31
<PAGE>
                         METROMEDIA FIBER NETWORK, INC.

             PRO FORMA CONDENSED COMBINING STATEMENTS OF OPERATIONS

                                  (UNAUDITED)

                      FOR THE YEAR ENDED DECEMBER 31, 1998

                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                                         METROMEDIA                  METROMEDIA
                                     ABOVENET       PAIX                    PRO FORMA       FIBER                       FIBER
                                    HISTORICAL   HISTORICAL   ADJUSTMENTS    ABOVENET    HISTORICAL    ADJUSTMENTS    PRO FORMA
                                    ----------   ----------   -----------   ----------   -----------   -----------   -----------
<S>                                 <C>          <C>          <C>           <C>          <C>           <C>           <C>
Revenue...........................   $  6,777     $ 4,362     $    --        $ 11,139      $36,436     $     --       $ 47,575
Expenses:
Cost of sales.....................      7,551       2,988        (405)(3)      10,134       13,937           --         24,071
Selling, general and
  administrative..................      7,843         450          --           8,293       14,712           --         23,005
Consulting and employment
  incentives......................      2,396          --          --           2,396        3,648           --          6,044
                                                               (1,944)(5)                                (6,970)(6)
Depreciation and amortization.....      1,497       1,944       7,375 (3)(5)     8,872       1,532       77,100 (7)     80,534
                                     --------     -------     -------        --------      -------     --------       --------
Income (loss) from operations.....    (12,510)     (1,020)     (5,026)        (18,556)       2,607      (70,130)       (86,079)
Other income (expense):
Interest income...................        337          --          --             337        8,788           --          9,125
Interest expense..................       (529)         --          --            (529)      (6,861)          --         (7,390)
Loss in joint venture.............         --          --          --              --         (146)          --           (146)
                                     --------     -------     -------        --------      -------     --------       --------
Net income (loss) before income
  taxes...........................    (12,702)     (1,020)     (5,026)        (18,748)       4,388      (70,130)       (84,490)
Income taxes......................         --          --          --              --        3,402       (3,402)(9)         --
                                     --------     -------     -------        --------      -------     --------       --------
Net income (loss).................   $(12,702)    $(1,020)    $(5,026)       $(18,748)     $   986     $(66,728)      $(84,490)
                                     ========     =======     =======        ========      =======     ========       ========
Net income (loss) per share --
  basic...........................                                                         $  0.01                    $  (0.37)
                                                                                           =======                    ========
Net income (loss) per share --
  diluted.........................                                                            0.01                         n/a
                                                                                           =======                    ========
Weighted average number of shares
  outstanding -- basic(8).........                                                         186,990                     228,642
                                                                                           =======                    ========
Weighted average number of shares
  outstanding -- diluted..........                                                         219,524                         n/a
                                                                                           =======                    ========
</TABLE>

                   (SEE THE ACCOMPANYING NOTES ON PAGE S-33)

                                      S-32
<PAGE>
                         METROMEDIA FIBER NETWORK, INC.

     NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINING FINANCIAL INFORMATION

(1) AboveNet historical amounts are for the period through the acquisition by us
    on September 8, 1999.

(2) Palo Alto Internet Exchange historical amounts are for the period through
    the acquisition by AboveNet on June 21, 1999.

(3) Reflects adjustments to conform to Company's presentation.

(4) Reflects the elimination of merger related expenses.

(5) Reflects adjustments related to the acquisition by AboveNet of Palo Alto
    Internet Exchange at January 1, 1998 for the income statements as follows:

     (i) the elimination of Palo Alto Internet Exchange historical intangible
         asset amortization; and

     (ii) the addition of amortization of the excess of cost over net tangible
          assets acquired of Palo Alto Internet Exchange ($69.7 million) over
          10 years.

(6) Reflects the elimination of AboveNet's historical intangible asset
    amortization.

(7) Reflects additional amortization of the excess of cost over net tangible
    assets acquired in the merger by use of the straight-line method over
    20 years.

(8) The average common shares outstanding used in calculating pro forma loss per
    common share are calculated assuming that the number of shares of our
    class A common stock issued in the merger were outstanding from the
    beginning of the periods presented.

(9) Reflects the adjustment of the tax provision.

                                      S-33
<PAGE>
               MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                      CONDITION AND RESULTS OF OPERATIONS

    YOU SHOULD READ THE FOLLOWING INFORMATION TOGETHER WITH OUR CONSOLIDATED
FINANCIAL STATEMENTS AND THE RELATED NOTES INCLUDED IN THIS PROSPECTUS
SUPPLEMENT BEGINNING ON PAGE F-1. CERTAIN STATEMENTS IN THIS SECTION ARE
"FORWARD-LOOKING STATEMENTS." YOU SHOULD READ THE INFORMATION UNDER "SPECIAL
NOTE REGARDING FORWARD-LOOKING STATEMENTS" FOR SPECIAL INFORMATION ABOUT OUR
PRESENTATION OF FORWARD-LOOKING INFORMATION.

GENERAL

    We provide dedicated fiber optic infrastructure and high-bandwidth Internet
connectivity for our communications intensive customers. We are a
facilities-based provider of technologically advanced, high-bandwidth, fiber
optic communications infrastructure to communications carriers and corporate and
government customers in the United States and Europe. Through our acquisition of
AboveNet, we also provide "one-hop" connectivity that enables mission critical
Internet applications to thrive, as well as high-bandwidth infrastructure,
including managed co-location services.

    We currently have operations in, or under construction in, eleven Tier I
cities throughout the United States and seven selected international markets. We
intend to expand our presence to include approximately 50 major markets in the
United States and 17 major international markets.

    Our existing intra-city networks currently consist of approximately 425,000
fiber miles covering in excess of 800 route miles in six of our announced
markets. Our inter-city network consists of approximately 120,000 fiber miles
primarily covering our 255 route-mile network that we have built between New
York City and Washington D.C. We have also built or contracted to acquire
(primarily through fiber swaps) a nationwide dark fiber network linking our
intra-city networks.

    In February 1999, we entered into an agreement with Viatel, Inc. and Carrier
1 Holdings, Ltd. to jointly build a dark fiber inter-city network among selected
cities throughout Germany. Once completed, our German network will consist of
approximately 291,000 fiber miles covering 1,350 route miles connecting 14 major
cities. We have also swapped strands of fiber in the United States for strands
of fiber on the Circe network, which connects a number of European markets. In
addition to our inter-city networks, we are constructing 16 intra-city networks
throughout Europe. Separately, we have also entered into a contract to gain
access to dark fiber network facilities in Toronto, Canada.

    On September 8, 1999, we completed the acquisition of AboveNet. The holders
of AboveNet common stock received 1.175 shares of our class A common stock for
each share of AboveNet common stock. AboveNet is a leading provider of
facilities-based, managed services for customer-owned Web servers and related
equipment, known as co-location, and high performance Internet connectivity
solutions for electronic commerce and other business critical Internet
operations.

    On October 7, 1999, we entered into a securities purchase agreement with
Bell Atlantic, under which Bell Atlantic would purchase up to approximately
25.6 million newly issued shares of our class A common stock at a purchase price
of $28.00 per share and a convertible subordinated note of approximately
$975.3 million, which is convertible into shares of our class A common stock at
a conversion price of $34.00 per share. We expect this transaction, which is
subject to customary closing conditions, to be completed by the end of the first
quarter of 2000. Assuming the issuance of the 25.6 million shares of class A
common stock and conversion of the convertible subordinated note, this
investment would represent 19.9% of our outstanding shares. Bell Atlantic has
also agreed to pay us $550 million over the next three years in exchange for
delivery of fiber optic facilities over the next five years. The proceeds from
these two transactions will be used to fund the expansion of our network.

    Most of our contracts for the provision of dark fiber are accounted for as
operating leases under which we recognize recurring monthly revenues. For
certain other contracts we recognize revenue under the percentage of completion
method for the provision of dark fiber. Effective June 30, 1999, the Financial

                                      S-34
<PAGE>
Accounting Standards Board issued FASB Interpretation No. 43 "Real Estate Sales"
("FIN 43"), which requires that sales or leases of integral equipment be
accounted for in accordance with real estate accounting rules. We believe that
the staff of the Securities and Exchange Commission requires the classification
of dark fiber cables in the ground as integral equipment as defined in FIN 43.
Accounting for dark fiber leases as defined by FIN 43 does not change any of the
economics of the contracts. It requires us, however, to recognize the revenue
from certain leases as operating leases over the term of the contract as opposed
to the prior method of recognizing revenue during the period over which we
deliver the fiber. As a result, this change in accounting treatment reduces the
revenue and income that we recognize in the earlier years of the contract and
spreads it out over the life of the contract regardless of when the cash was
received or the delivery of the fiber took place.

    By way of example, if we entered into an agreement for a 25 year lease for
dark fiber with a customer who pays $100.0 million in cash when the contract is
signed, we previously recorded average revenues of $20.0 million over the 5
years during which we delivered the dark fiber. By contrast, the real estate
accounting rules of FIN 43 would require us to recognize revenue of
$4.0 million per year over the 25 year term of the contract, even though we
would receive a cash payment of $100.0 million when the contract is signed.

    We implemented accounting for certain of our contracts, entered into after
June 30, 1999, under this method of accounting. As a result, although there was
no change to the economics of the contracts or the timing of the cash to be
received by us, the impact of the change in accounting resulted in our recording
$10.7 million in revenues for the quarter ended September 30, 1999 rather than
$32.7 million that would have been recorded prior to this change. Without this
change in accounting we would also have recorded earnings before interest,
taxes, depreciation and amortization of $2.6 million rather than a loss before
interest, taxes, depreciation and amortization of $12.4 million for the three
months ended September 30, 1999.

STOCK SPLITS

    On August 28, 1998, December 22, 1998, and May 19, 1999, we completed
two-for-one stock splits of our class A and class B common stock in the form of
100 percent stock dividends to all stockholders of record as of certain
specified dates.

    All share and per share amounts presented herein give retroactive effect to
the stock dividends. As of September 30, 1999, adjusted for the effect of the
stock dividends, we had 198,822,053 class A common shares outstanding and
33,769,272 class B common shares outstanding.

RESULTS OF OPERATIONS

NINE MONTHS ENDED SEPTEMBER 1999 COMPARED TO NINE MONTHS ENDED SEPTEMBER 1998
  (HISTORICAL).

    REVENUES.  Revenues for the nine months ended September 30, 1999 were $49.4
million or 138% greater than revenues of $20.8 million for the same period in
1998. The increase reflected higher revenues associated with commencement of
service to an increased total number of customers, as well as revenue recognized
related to sales-type leases of portions of our network for contracts entered
into before June 30, 1999, sales of portions of our network through joint-build
agreements and the inclusion of AboveNet's revenue for the period of
September 9, 1999 through September 30, 1999. Revenues were, however, impacted
as a direct result of the aforementioned accounting change, effective June 30,
1999, whereby under real estate accounting we are required to recognize revenue
on certain dark fiber leases over the term of the contract rather than under the
percentage of completion method. If we had continued to recognize revenues on
leases entered into after June 30, 1999, under the prior accounting method,
revenues would have been $71.4 million for the nine months ended September 30,
1999.

                                      S-35
<PAGE>
    COST OF SALES.  Cost of sales was $24.4 million for the nine months ended
September 30, 1999, a 157% increase over cost of sales of $9.5 million for the
first nine months of 1998. Cost of sales increased for the nine months ended
September 30, 1999 compared with the same period in 1998 due to costs associated
with the commencement of service to customers, as well as higher fixed costs
associated with the operation and maintenance of our network. Costs of sales as
percentages of revenue for the first nine months of 1999 and 1998 were 49% and
46% respectively, increasing as a result of the higher fixed costs related to
the operation and maintenance of the Company's network. Cost of sales was also
impacted as a direct result of the aforementioned accounting change, effective
June 30, 1999, whereby we are required to recognize revenue on certain dark
fiber leases over the term of the contract rather than under the percentage of
completion method. Under the prior accounting method, cost of sales would have
been $31.4 million for the nine months ended September 30, 1999. As a percentage
of revenues, for the nine months ended September 30, 1999, cost of sales would
have been 44%, rather than the 49% reported.

    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES.  Selling, general and
administrative expenses increased to $27.4 million during the nine months ended
September 30, 1999 from $9.8 million during the nine months ended September 30,
1998, an increase of $17.6 million, or 180%. The increase in selling, general
and administrative expenses resulted primarily from increased overhead to
accommodate our network expansion. As a percentage of revenue, selling, general
and administrative expenses increased to 55% of revenue for the nine months
ended September 30, 1999, from 47% for the comparable period in 1998. Selling,
general and administrative expenses were also impacted as a direct result of the
aforementioned accounting change, effective June 30, 1999, whereby we are
required to recognize revenue on certain dark fiber leases over the term of the
contract rather than under the percentage of completion method. Under the prior
accounting method, selling, general and administrative expenses as a percentage
of revenues for the nine months ended September 30, 1999 would have been 38%,
rather than the 55% reported.

    SETTLEMENT AGREEMENT.  We recorded $3.4 million for a settlement agreement
in the three months ended March 31, 1998. The amount represented the expense
associated with the issuance of stock options and payment of cash related to
that settlement agreement.

    EARNINGS BEFORE INTEREST, TAXES, DEPRECIATION AND AMORTIZATION
(EBITDA).  For the nine months ended September 30, 1999 we recognized a loss
before interest, taxes, depreciation and amortization of $2.4 million compared
with a loss before interest, taxes, depreciation and amortization for the nine
months ended September 30, 1998 of $2.1 million. If we had not implemented the
aforementioned accounting change for certain dark fiber leases entered into
after June 30, 1999, we would have recognized earnings before interest, taxes,
depreciation and amortization of $12.6 million or $15.0 million higher than
recorded for the nine month period ended September 30, 1999 and $14.7 million
higher than recorded for the same period last year.

    DEPRECIATION AND AMORTIZATION.  Depreciation and amortization of
$15.6 million was recorded during the nine months ended September 30, 1999
versus $738,000 during the nine months ended September 30, 1998, an increase of
$14.9 million. The increase in depreciation and amortization expense resulted
from amortization of the goodwill relating to the amortization of AboveNet and
Communications Systems Development, Inc. and increased investment in our
completed fiber optic network and additional property and equipment acquired.

    INCOME (LOSS) FROM OPERATIONS.  For the nine months ended September 30,
1999, loss from operations was $18.0 million, a $15.1 million increase over the
$2.9 million loss for the comparable period in 1998. The loss was greater as a
direct result of the aforementioned accounting change, effective June 30, 1999.
If we had not adopted the accounting method change, the loss would have been
approximately $3.0 million for the nine months ended September 30, 1999.

    INTEREST INCOME.  Interest income was $19.1 million during the nine months
ended September 30, 1999 compared with $5.0 million during the comparable 1998
period, an increase of $14.1 million or 282%.

                                      S-36
<PAGE>
Interest income increased as a result of the investment of certain of the
proceeds from the issuance and sale of our 10% senior notes in November 1998.

    INTEREST EXPENSE (NET).  Interest expense increased for the nine months
ended September 30, 1999 to $44.9 million compared with $16,000 during the same
period of 1998. The increase in interest expense reflects the cost of additional
debt acquired related to the issuance and sale of 10% senior notes in
November 1998.

    INCOME (LOSS) FROM JOINT VENTURES.  For the nine months ended September 30,
1999 we recorded a $475,000 loss from the joint ventures compared with a
$264,000 loss for the nine months ended September 30, 1998.

    NET LOSS.  We had net loss of $44.3 million for the nine months ended
September 30, 1999, versus net income of $1.1 million for the comparable period
of 1998. For the nine months ended September 30, 1999, the basic net loss per
share was $0.23 versus a basic net income per share of $0.01 for the same period
in 1998. The net losses were primarily attributable to the increase in net
interest expense related to the issuance and sale of our 10% senior notes in
November 1998. The loss was greater as a direct result of the aforementioned
accounting change, effective June 30, 1999, whereby we are required to recognize
revenues on certain dark fiber leases over the term of the contract rather than
under the percentage of completion method. If we had continued to recognize
revenues under the prior accounting method the loss would have been
approximately $15 million less ($0.08 per share) for the nine months ended
September 30, 1999. In addition, net interest expense related to the Company's
debt amortization of goodwill associated with the AboveNet and Communications
Systems Development, Inc. acquisitions and inclusion of AboveNet's results of
operations compounded the loss.

    YEAR ENDED DECEMBER 31, 1998 COMPARED TO YEAR ENDED DECEMBER 31, 1997

    REVENUES.  Revenues for 1998 were $36.4 million or 1,356% greater than
revenues of $2.5 million for 1997. The increase in revenue for 1998 versus 1997
reflected higher revenues associated with commencement of service to an
increased total number of customers, as well as revenue recognized related to
grants of indefeasible rights of use to portions of our network and sales of
dark fiber classified as sales type leases.

    COST OF SALES.  Cost of sales was $13.9 million in 1998, a 286% increase
over cost of sales of $3.6 million in 1997. Cost of sales increased for 1998 as
compared to 1997 due to costs associated with the commencement of service to
customers, higher fixed costs associated with the operation of our network in
service and the allocated costs of the network related to revenue recognized for
grants of indefeasible rights of use to portions of our network and sales type
leases of portions of our dark fiber classified as capital leases. Costs of
sales, as percentages of revenue for 1998 and 1997 were 38% and 142%,
respectively, declining as a result of the significant increase in the number of
customers and revenues.

    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES.  Selling, general and
administrative expenses for 1998 were $14.7 million or 133% greater than
selling, general and administrative expenses of $6.3 million during 1997. The
increase in selling, general and administrative expenses for 1998 as compared to
1997 resulted primarily from increased overhead to accommodate our network
expansion.

    CONSULTING AND EMPLOYMENT INCENTIVES EXPENSE.  Consulting and employment
incentives expense for 1998 were $0.2 million compared with $19.2 million for
1997. Consulting and employment incentives expense incurred in 1997 reflects the
value of stock options issued to key employees, officers and directors in order
to attract or retain their services. For 1998, the amount recorded reflects
amortization for the unvested component of options issued in 1997 to key
employees.

    SETTLEMENT AGREEMENT.  We recorded $3.4 million for a settlement agreement
in 1998. The amount was recorded in the first quarter of 1998 for the expense
associated with the issuance of stock options and payment of cash related to a
settlement agreement.

                                      S-37
<PAGE>
    DEPRECIATION AND AMORTIZATION EXPENSE.  Depreciation and amortization
expense for 1998 was $1.5 million or 88% greater than depreciation and
amortization expense of $0.8 million during 1997. The increases in depreciation
and amortization expense resulted from increased investment in our completed
fiber optic network and property and equipment.

    INTEREST INCOME (EXPENSE).  Interest income for 1998 was $8.8 million or
389% greater than interest income of $1.8 million during 1997. Interest income
during 1998 was derived from investment of our excess cash received as proceeds
from our initial public offering in October 1997 and the additional cash
received in November 1998 from the proceeds of our $650 million note issuance.
Interest expense increased in 1998 to $6.9 million as compared to $0.7 million
for 1997. The increase in interest expense reflects interest accrued for the
senior notes issued in November 1998.

    INCOME (LOSS) FROM JOINT VENTURE.  We recorded a $0.1 million loss from our
50% share of the ION joint venture's loss for 1998. The loss primarily
represents startup costs and operating activities for the joint venture.

    INCOME TAXES.  We recorded a provision for income taxes for 1998 in the
amount of $3.4 million. This represents an estimated effective tax rate, for
federal and state taxes, of 77.5%.

    NET INCOME (LOSS).  Net income was $1.0 million for 1998, as compared to a
net loss of $26.3 million for 1997. For 1998, basic net income per share was
$0.01 as compared to a basic net loss per share of $0.28 for 1997. On a diluted
basis, net income per share for 1998 was $0.01.

    The improvements in results for 1998 were primarily attributable to the
growth of revenues and the improvements in gross margins, as noted above, as
well as the increase in net interest income related to the investment made by
Metromedia Company and the funds raised through our initial public offering as
compared to net interest expense.

    YEAR ENDED DECEMBER 31, 1997 COMPARED TO YEAR ENDED DECEMBER 31, 1996

    REVENUES.  Revenues for 1997 were $2.5 million, a 1,150% increase as
compared to 1996 revenues of $0.2 million. The revenue increase was generated by
one-time revenues associated with commencement of services to customers as well
as increased recurring lease revenues, which reflects the growth in the number
of our customers.

    COST OF SALES.  Cost of sales for 1997 was $3.6 million, an increase of 414%
as compared to the $0.7 million that was recorded as cost of sales in 1996. The
increase in cost of sales was associated with the increased revenues. Cost of
sales as a percentage of revenues improved to 142% in 1997 from 296% in 1996.
The improvement in cost of sales as a percentage of revenues reflects the
increases in revenue outdistancing the increases in cost, as the components of
cost were mostly of a fixed nature.

    SELLING, GENERAL AND ADMINISTRATIVE EXPENSES.  Selling, general and
administrative expenses for 1997 was $6.3 million or 200% greater than selling,
general and administrative expenses of $2.1 million in 1996. This increase
resulted primarily from increased legal expenses as a result of our increased
business activities and the increased staffing to accommodate our anticipated
growth.

    CONSULTING AND EMPLOYMENT INCENTIVES EXPENSE.  Consulting and employment
incentives expense for 1997 was $19.2 million or 419% greater than consulting
and employment incentives expenses of $3.7 million in 1996. The 1997 expense
represents the value of stock options issued to key employees, officers,
directors and consultants in order to attract or retain their services. The
amount recorded in 1996 reflects the expense associated with issuance of stock
and warrants to consultants in consideration for services rendered.

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<PAGE>
    DEPRECIATION AND AMORTIZATION EXPENSE.  Depreciation and amortization
expense was $0.8 million in 1997 as compared to $0.6 million in 1996. The
increase in depreciation and amortization expense resulted from increased
investment in our fiber optic network.

    INTEREST INCOME (EXPENSE).  We had interest income of $1.8 million in 1997
as compared to no interest income during 1996. The interest income in 1997 arose
from the investment of our excess cash during the year. In 1996, we had no
excess cash to invest and, accordingly, earned no interest income. Interest
expense (including financing costs) decreased in 1997 to $0.7 million from $3.6
million in 1996. The decrease in interest expense reflects the repayment of all
of our debt during the year with the proceeds of the investment made by
Metromedia Company, as well as lower financing costs.

    NET LOSS.  We recorded a net loss of $26.3 million in 1997 as compared to a
net loss of $10.4 million in 1996. The increase in the net loss was primarily
attributable to costs associated with organizing to meet our growth objectives.
In particular, such costs include the consulting and employment incentive,
described above, to attract and retain key employees, officers and directors, as
well as increased overhead to meet our growth objectives.

LIQUIDITY AND CAPITAL RESOURCES

    Our initial public offering, on October 28, 1997, of 72,864,000 shares of
class A common stock generated net proceeds of $133.9 million, after deducting
the underwriter's commission and expenses relating to such initial public
offering. In addition, on November 25, 1998, we issued and sold 10% Senior Notes
due 2008 which generated net proceeds of $630.0 million. After the end of the
third quarter, on October 7, 1999, we entered into a securities purchase
agreement with Bell Atlantic, under which Bell Atlantic would purchase shares of
our class A common stock and a convertible subordinated note.

    We expect that the Bell Atlantic transaction, which is subject to customary
closing conditions, will close by the end of the first quarter of 2000 and
generate net proceeds of approximately $1.7 billion. In addition, Bell Atlantic
has agreed to purchase a minimum of $550 million of fiber optic facilities
payable over the next three years.

    For the nine months ended September 30, 1999, our operating activities
generated $6.3 million of cash, compared with $16.9 million during the
comparable period in 1998. For the nine months ended September 30, 1999, we used
$211.3 million of cash for net investing activities compared with $80.3 million
for the same period in 1998. This increase was due primarily to investments in
the expansion of our networks and related construction in progress, the
restriction of cash as security for letters of credit in connection with our
German network build, and the acquisition of dark fiber infrastructure in
certain markets in Texas. Offsetting these items was the cash acquired through
the AboveNet acquisition. For the nine months ended September 30, 1999, we made
net payments of $11.5 million of cash from financing activities, compared with
$892,000 of net proceeds from the issuance of common stock in 1998.

    We anticipate that we will continue to incur net operating losses as we
expand and complete our existing networks, construct additional networks and
market our services to an expanding customer base. We anticipate spending
approximately $3.4 billion through the year ending December 31, 2001 on the
build-out of our fiber optic networks and Internet service exchanges in 50 major
markets in the United States and in 17 major international markets. We believe
that the net proceeds from the investment by Bell Atlantic, the net proceeds
from this offering of notes, cash on hand, certain vendor financing and cash
generated by operations (including advance customer payments), will enable us to
fully fund the planned build-out of our networks and our other working capital
needs through the year ended December 31, 2001. The indentures governing our
debt obligations permit us to incur additional indebtedness to finance the
engineering, construction, installation, acquisition, lease, development or
improvement of telecommunications assets. As a result, we may also consider from
time to time private or public sales of additional equity or debt securities,
entering into other credit facilities and financings, depending upon market
conditions, in

                                      S-39
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order to finance the continued build-out of our network. We cannot assure you
that we will be able to successfully consummate any such financing on acceptable
terms or at all.

    We expect to continue to experience negative cash flows for the foreseeable
future. In addition, as part of our acquisition of AboveNet, we recorded
approximately $1.6 billion in goodwill and other intangible assets, which we
amortized over periods up to twenty years. Accordingly, we expect to report
further net operating losses for the foreseeable future.

YEAR 2000 SYSTEM MODIFICATIONS

    We are currently working to evaluate and resolve the potential impact of the
Year 2000 on our processing of date-sensitive information and network systems.
The Year 2000 problem is the result of computer programs being written using two
digits (rather than four) to define the year 2000, which could result in
miscalculations or system failures resulting from recognition of a date using
"00" as the year 1900 rather than the year 2000.

    We have delegated responsibility to a group of executives to coordinate the
identification, evaluation and implementation of changes to computer systems and
applications necessary to achieve our goal of a Year 2000 date conversion which
would minimize the effect on our customers and avoid disruption to business
operations. We are also focusing on hardware and software tools, programming and
outside forces that may affect our operations, including our vendors, banks and
utility companies. Our analysis of the Year 2000 threat is ongoing and will be
continuously updated throughout 1999 as necessary.

    For Metromedia Fiber Network, we have developed a questionnaire and project
plan to be completed by our systems and operating personnel to identify all
business and computer applications so that we can identify potential compliance
problems. We have initiated communications with our significant customers,
suppliers, contractors and major systems developers to determine their plans to
remedy any Year 2000 issues that arise in their business with us. We have
compiled a database of information based upon these responses. To the extent
problems are identified, we are implementing corrective procedures where
necessary, then testing the applications for Year 2000 compliance. We expect to
complete this project prior to January 1, 2000.

    Based on preliminary data, our estimate is that the Year 2000 effort will
have a nominal cost impact, although we can make no assurances as to the
ultimate cost of the Year 2000 effort or the total cost of information systems.
Such costs are expensed as incurred, except to the extent such costs are
incurred for the purchase or lease of capital equipment. We have made some of
the necessary modifications through our ongoing investment in system upgrades.
We believe that our exposure to this issue, based on our internal systems, is
somewhat limited by the fact that substantially all of our existing systems have
been purchased or replaced since 1997.

    As of September 30, 1999, we had incurred nominal costs in respect of our
Year 2000 conversion effort. We have not deferred any other information systems
projects due to the Year 2000 efforts. The source of funds for Year 2000 costs
has been cash on hand. Accordingly, we are devoting the necessary resources to
resolve all significant Year 2000 issues.

    If our customers, suppliers, contractors or major systems developers are
unable to resolve Year 2000 processing issues in a timely manner, a material
adverse effect on our results of operations and financial condition could
result.

    AboveNet's Year 2000 readiness review includes assessment, implementation,
testing and contingency planning. To date, AboveNet has evaluated its internally
developed software and believes that this software is Year 2000 compliant.
However, AboveNet utilizes software and hardware developed by third parties both
for its network and internal information systems. AboveNet has not done any
testing of such third party software to determine if such software is Year 2000
compliant. AboveNet has sought assurances from

                                      S-40
<PAGE>
some of its vendors, and intends to continue to seek assurances from others,
that such vendors' products are or will be Year 2000 compliant.

    AboveNet expects to continue assessing and testing its internal information
technology and non-information technology systems. AboveNet is not currently
aware of any material operations issues or costs associated with preparing its
internal information technology and non-information technology systems for the
Year 2000. However, AboveNet may experience material unanticipated problems and
costs caused by undetected errors or defects in the technology used in its
internal information technology and non-information technology systems.

    Based upon the public filings and press releases of AboveNet's equipment,
telecommunications and data communications providers, AboveNet is aware that all
such providers are in the process of reviewing and implementing their own Year
2000 compliance programs. Since AboveNet does not believe that it will be
afforded the opportunity to test the systems of these providers, AboveNet will
seek assurances from them that they are Year 2000 compliant. If AboveNet's
primary vendors experience business interruptions as a result of the failure to
achieve Year 2000 compliance, AboveNet's ability to provide Internet
connectivity could be impaired, which could have a material adverse effect on
AboveNet's business, results of operations and financial condition.

    AboveNet does not currently have any information regarding the Year 2000
status of its customers, most of whom are private companies. However, AboveNet
is in the process of developing a plan to survey all of its customers regarding
their Year 2000 compliance. As in the case with similarly situated companies, if
its customers experience Year 2000 problems, which result in business
interruptions or otherwise impact their operations, AboveNet could experience a
decrease in the demand for its services, which could have a material adverse
impact on its business, results of operations and financial condition.

    AboveNet has not incurred any significant expenses to date associated with
its Year 2000 plan and is not aware of any material costs associated with its
anticipated Year 2000 efforts. AboveNet believes that a material loss of revenue
would arise if its major customers or providers fail to achieve Year 2000
readiness. AboveNet has not yet developed a comprehensive contingency plan to
address the issues, which could result from such failure.

    This constitutes a Year 2000 Readiness Disclosure Statement, and the
statements are subject to the Year 2000 Information and Readiness Disclosure
Act. We hereby claim the protection of this act for this prospectus supplement
and all information contained herein.

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<PAGE>
                                    BUSINESS

GENERAL

    We provide dedicated fiber optic infrastructure and high-bandwidth Internet
connectivity for our communications intensive customers. We are a
facilities-based provider of technologically advanced, high-bandwidth, fiber
optic communications infrastructure to communications carriers and corporate and
government customers in the United States and Europe. Through our acquisition of
AboveNet, we also provide "one-hop" connectivity that enables mission critical
Internet applications to thrive, as well as high-bandwidth infrastructure,
including managed co-location services.

    THE INTRA-CITY NETWORKS.  Our existing intra-city networks consist of
approximately 425,000 fiber miles covering in excess of 800 route miles in six
of our announced markets. We are currently planning to expand our existing local
intra-city networks in these metropolitan areas, and to construct additional
intra-city networks in approximately 40 additional Tier I and Tier II markets in
the United States.

    THE INTER-CITY NETWORKS.  Our inter-city network currently consists of
approximately 120,000 fiber miles primarily covering our 255 route-mile network
that we have built between New York City and Washington, D.C. We have also
obtained, primarily through exchanges of fiber capacity or "fiber swaps" with
other carriers, a nationwide fiberoptic network.

    THE INTERNATIONAL NETWORKS.  In addition to our domestic build-up, we intend
to expand our international presence to include approximately 17 major markets.
In February 1999, we entered into an agreement with Viatel, Inc. and Carrier 1
Holdings, Ltd. to jointly build a dark fiber inter-city network between selected
cities throughout Germany. Once completed, the German network will consist of
approximately 291,000 fiber miles covering 1,350 route miles connecting 14 major
cities. We have also swapped strands of fiber in the United States for strands
of fiber on the Circe network, which connects a number of European markets. In
addition to our inter-city networks, we are constructing 16 intra-city networks
throughout Europe. Separately, we have also entered into a contract to acquire
dark fiber network facilities in Toronto, Canada.

    INTERNET CONNECTIVITY.  Through our acquisition of AboveNet, we are a
leading provider of high performance Internet connectivity services to a wide
range of Internet service providers, Internet content providers and Web hosting
companies and facilities based, managed co-location services. Our Internet
exchange server facilities provide high performance, reliable and scalable
solutions for electronic commerce and other business critical applications.
AboveNet developed a network architecture based upon strategically located,
fault-tolerant Internet exchange servers. We currently operate two Internet
service exchange campuses, located near two of the major Internet access points,
metropolitan area exchange (often referred to as "MAE") West and MAE East, using
our suite of sophisticated network management and remote monitoring tools. We
believe that our centralized network architecture provides enhanced connectivity
while eliminating the need to build numerous geographically dispersed data
centers. AboveNet's Internet service exchange model offers customers the
benefits of combining direct Internet service providers access with co-location
services for Internet content providers. As of September 30, 1999, AboveNet had
more than 270 direct public and private data exchange agreements, known as
peering arrangements, including relationships with most major network providers.
The convergence of content providers and Internet service providers at our
Internet service exchanges enables Internet service provider customers to
provide their users with "one hop" connectivity, through our local area network,
to the Web sites of the Internet content providers that are co-located at the
same site. This direct connectivity minimizes the risk of delays and data loss
often encountered in the transmission of data over the public Internet
infrastructure.

    CUSTOMERS.  We are focused on providing our broadband communications
infrastructure and Internet connectivity services to two main customer groups
located in Tier I and Tier II markets: communications carriers and
corporate/government customers.

                                      S-42
<PAGE>
    Our targeted customers include a broad range of companies such as:

    - ILECs;

    - CLECs;

    - long distance companies/IXCs;

    - paging, cellular and PCS companies;

    - cable companies;

    - ISPs; and

    - Web hosting and e-commerce companies.

    Our dark fiber customers typically lease our fiber optic capacity with which
they develop their own communications networks. Leasing our fiber optic capacity
is a low-cost alternative to building their own infrastructure or purchasing
metered services from ILECs or CLECs. Our Internet connectivity and co-location
customers typically lease bandwidth and co-location space which allow them to
provide their Internet related services on a reliable and cost effective basis.
We believe that we are well-positioned to penetrate our target customer base
since we plan to continue to install most of our dark fiber networks and
Internet service exchanges in major markets where these customers are
concentrated. We believe our target customers for our dark fiber and Internet
connectivity are complementary and will provide significant cross selling
opportunities.

    NETWORK INFRASTRUCTURE.  We have designed our networks to provide high
levels of reliability, security and flexibility by virtue of a self-healing
SONET architecture that prevents interruption in service to our clients by
instantaneously rerouting traffic in the event of a fiber cut. Our advanced
network architecture is also capable of supporting state-of-the-art
technologies, including DWDM (dense wave division multiplexing) which
significantly increases the transmission capacity of a strand of fiber optic
cable. Because DWDM can boost transmission capacity significantly, it has
greater relevance on our inter-city routes where we have, on average, fewer
strands of fiber installed than in our intra-city markets. Where practicable, we
install additional unused conduits to cost effectively accommodate future
network expansion and eliminate the need for future construction.

    MARKET OPPORTUNITY.  We believe that the market for our dark fiber services
is characterized by significant and growing demand for, and limited supply of,
fiber optic capacity. To meet our customers' demand, we tailor the amount of
fiber capacity leased to the needs of our customers. Generally, customers lease
fiber optic capacity from us and connect their own transmission equipment to the
leased fiber, thereby obtaining a high-bandwidth, fixed-cost, secure
communications alternative to the metered communications services offered by
traditional providers. In addition, we believe that we have installation,
operating and maintenance cost advantages per fiber mile relative to our
competitors because we generally install 432 fibers, and have begun installing
as many as 864 fibers, per route mile, as compared to the generally lower number
of fibers per mile in existing competitive networks.

    We believe the market for our Internet service exchanges is characterized by
significant and growing demand for, and limited access to, highly reliable
Internet connectivity and co-location services. To meet our customers' demands,
we provide scalable connectivity and co-location services that drive our
customers' electronic commerce and other mission critical Internet applications.
Our customers lease bandwidth and co-location space from us to gain highly
reliable, secure and cost effective Internet connectivity. Through our existing
and planned networks, we believe we have the low cost position relative to those
competitors who lease rather than own their networks.

    MANAGEMENT EXPERTISE.  We benefit from the support of our controlling
stockholder Metromedia Company and anticipate similar benefits from our
anticipated investment by Bell Atlantic. On April 30, 1997, Metromedia Company
and certain of its affiliates made a substantial equity investment in our

                                      S-43
<PAGE>
company (the "Metromedia Investment"). As a result, Metromedia Company and its
partners own all of our outstanding shares of class B common stock, par value
$.01 per share. Our class B common stock is entitled to 10 votes per share and
to vote separately to elect at least 75% of the members of the Board of
Directors. As of September 30, 1999, Metromedia Company and its partners own and
control approximately 63% of the outstanding voting power of our company.

    RECENT TRANSACTIONS.  On October 7, 1999, we entered into a securities
purchase agreement with Bell Atlantic, under which Bell Atlantic Investments
would purchase up to approximately 25.6 million newly issued shares of our class
A common stock at a purchase price of $28.00 per share and a convertible
subordinated note of approximately $975.3 million, which is convertible into
shares of our class A common stock at a conversion price of $34.00 per share.
This transaction, which is subject to customary closing conditions, is expected
to be completed by the end of the first quarter of 2000. Assuming the issuance
of the 25.6 million shares of class A common stock and conversion of the
convertible subordinated note, this investment would represent 19.9% of our
outstanding shares. Bell Atlantic has also agreed to pay us $550 million over
the next three years in exchange for delivery of fiber optic facilities over the
next five years. The proceeds from these two transactions will be used to fund
the expansion of our network.

BUSINESS STRATEGY

    Our objective is to become the preferred facilities-based provider of
broadband communications infrastructure and Internet connectivity solutions to
communications carriers, corporations and government agencies, in our target
markets. The following are the key elements of our strategy to achieve this
objective:

ESTABLISH THE COMPANY AS THE PREFERRED CARRIERS' CARRIER OF BROADBAND
  COMMUNICATIONS INFRASTRUCTURE AND INTERNET CONNECTIVITY SOLUTIONS

    - Lease broadband communications infrastructure on a fixed cost basis

    - Enable carriers to penetrate markets previously too costly to build or
      purchase

    - Allow customers to bypass the ILECs and CLECs

    - Continue to differentiate ourselves as the only company whose principal
      business is providing dark fiber on a fixed cost basis

    - Lease high-bandwidth long haul capacity to provide seamless connectivity
      between our intra-cities

    - Provide Internet connectivity services through leasing bandwidth and
      co-location space to ISPs

    - Enable ISPs to provide reliable, high-quality Internet access services

    - Capitalize on the fact that we do not offer competing metered
      communications or retail Internet connectivity solutions in competition
      with our carrier and ISP customers

POSITION THE COMPANY AS THE PREFERRED PROVIDER OF BROADBAND COMMUNICATIONS
  INFRASTRUCTURE AND INTERNET CONNECTIVITY SERVICES TO CORPORATE AND GOVERNMENT
  CUSTOMERS

    - Target broadband communications infrastructure customers with significant
      transmission and high security needs

    - Provide scalable services for customers seeking lower broadband
      transmission capacity

    - Offer our dark fiber services on a fixed cost rather than metered basis,
      to provide a more economical solution to our customers

                                      S-44
<PAGE>
    - Target Internet connectivity customers who require reliable, secure and
      cost effective connectivity to the internet to drive their electronic
      commerce and other mission critical business Internet applications

    - Capitalize on the complementary customer bases for our Infrastructure and
      Internet connectivity services through effective cross selling

REPLICATE SUCCESSFUL BUSINESS MODEL IN NEW MARKETS

    - Leverage our success in existing markets by replicating our network
      architecture in a number of additional markets

    - Rapidly roll out our U.S. network to a total of approximately 50
      intra-city networks in Tier I and Tier II markets

    - Expand our international market coverage to a total of approximately 17
      markets

    - Deploy Internet service exchanges in selected U.S. and international
      markets, replicating the successful AboveNet design

CREATE A LOW COST POSITION

    - Provide our customers a cost effective alternative to constructing their
      own networks and Internet connectivity facilities

    - Install trunks with up to 864 fibers per route mile, which is
      substantially more fiber than our competitors, reducing our per mile cost
      to construct, upgrade and operate our networks

    - Capitalize on the operating and maintenance cost advantages generated by
      our newly constructed networks, with advanced fiber optic technology

    - Create first mover advantages for us versus new entrants by securing
      rights of way and building our networks quickly

    - Install spare conduit where practical to reduce expansion and upgrade
      costs in the future and provide significant excess capacity

    - Establish a low cost advantage for our Internet connectivity services by
      utilizing our own network rather than leasing capacity like some of our
      competitors

    - Use our low cost position to remain price competitive with other providers
      of broadband communications infrastructure and Internet connectivity
      services

UTILIZE FIBER SWAPS AND STRATEGIC RELATIONSHIPS TO EXPAND THE REACH OF OUR
NETWORKS

    - Opportunistically utilize fiber swaps, as we have in the past, to expand
      our network reach at little incremental cost

    - Enter into strategic relationships, such as our joint build arrangement
      with Viatel, to cost effectively expand our network footprint

EXPAND PRODUCT AND SERVICE OFFERINGS TO UTILIZE DARK FIBER NETWORK CAPACITY.

    - Vertically expand our service offering by identifying additional uses for
      our dark fiber network, such as with the AboveNet acqusition, that will
      drive new revenue opportunities and cost synergies

    - Maintain our competitive advantage by offering services that do not
      directly compete with our carrier customers

    - Focus on serving our carrier and large corporate/government customers'
      bandwidth intensive communications needs

                                      S-45
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INSTALL TECHNOLOGICALLY ADVANCED NETWORKS AND INTERNET SERVICE EXCHANGES

    - Continue to install a technologically advanced network based on
      self-healing SONET architecture

    - Use our self-healing SONET architecture to minimize the interruption to
      service caused by fiber cuts

    - Construct our networks to deliver the high levels of reliability, security
      and flexibility that our customers demand

    - Continually monitor and maintain quality control over our networks on a
      24-hour basis

    - Continue to ensure our network is capable of providing the highest
      commercially available capacity transmission (OC-192) to support capacity
      intensive data applications such as Frame Relay, ATM and Internet
      applications

    - Provide fault tolerant Internet service exchange facilities designed to
      enable the uninterrupted operations necessary for mission critical
      business applications

    - Use our proprietary software to monitor our network connections for
      latency and packet loss and automatically reroute Internet traffic to
      avoid Internet congestion points

BUILD ON MANAGEMENT EXPERIENCE AND METROMEDIA COMPANY RELATIONSHIP

    - Leverage the communications industry knowledge and sales expertise of our
      management team and board of directors including:

     - Stephen Garofalo, our Chief Executive Officer and founder, who has
      approximately 25 years of experience in the cable installation business

     - Howard M. Finkelstein, our President and Chief Operating Officer, who
      served in various capacities in Metromedia Company and its affiliates over
      a period of 16 years, including 9 years as President of Metromedia
      Company's long distance telephone company, until its merger with MCI/
      WorldCom, Inc. in 1993

     - David Rand and Sherman Tuan who joined our Board of Directors following
      the acquisition of AboveNet and have extensive experience with Internet
      related ventures

     - John W. Kluge, Stuart Subotnick and David Rockefeller, each of whom bring
      extensive communications industry expertise and corporate governance
      experience

BUILD-OUT OF NETWORKS

    We have concentrated on developing and constructing our networks. We have
either obtained or are currently pursuing the acquisition of necessary licenses,
franchises and rights-of-way to construct these networks. In constructing our
fiber optic networks, we seek to create strategic alliances with the engineering
and construction management firms that have been engaged to develop routes,
easements and manage deployment plans. Firms with whom we are allied in this
regard have deployed local loop network infrastructure for RBOCs as well as for
CLECs. Though we anticipate to outsource much of the actual construction to
various construction firms, we maintain strict oversight of the design and
implementation of our fiber optic communications networks. We utilize only
advanced commercially available fiber. We have ordered a substantial portion of
our fiber optic cable from Lucent Technologies, Inc. However, we believe that we
could obtain advanced fiber from other suppliers on acceptable terms.

    Our existing intra-city networks currently consist of approximately 425,000
fiber miles covering in excess of 800 route miles in six of our announced
markets. Our inter-city network consists of approximately 120,000 fiber miles
primarily covering our 255 route-mile network that we have built between New
York City and Washington D.C. We have also built or, contracted to acquire,
primarily through fiber swaps, a nationwide dark fiber network linking our
intra-city networks.

                                      S-46
<PAGE>
    We have entered into a forty year agreement with a subsidiary of Racal, a
United Kingdom manufacturer of electronics and other equipment and a provider of
telecommunications services, to create ION, a joint venture in which we hold a
50% equity interest. ION has obtained transatlantic fiber optic cable rights on
Gemini and AC-1 which link our New York network to London, England. Through ION,
we are able to offer our customers seamless broadband transatlantic
communications services between New York and London. Under the ION joint venture
agreement, each party may contribute additional capital as agreed by the
parties. In May 1998, ION was awarded a 25 year term contract in excess of $25
million from a leading provider of undersea cable capacity to provide inland
capacity services from such provider's undersea cable landing stations in the
U.K. and the U.S.

    We have also entered into an agreement with Carrier 1 Holdings, Ltd and
Viatel, Inc., to develop jointly approximately 291,000 fiber miles covering
1,350 route miles that will connect 14 of Germany's largest cities such as
Hamburg, Berlin, Munich, Frankfurt and Dusseldorf. We have also signed an
agreement with Viatel pursuant to which we would receive the right to use
approximately 3,880 fiber miles covering approximately 970 route miles on
Viatel's network in France, Germany, The Netherlands and the United Kingdom. Our
networks will be high-capacity broadband networks capable of supporting high-
quality voice, video, internet protocol and data traffic and built using a
self-healing SONET architecture.

THE ABOVENET INTERNET SERVICE EXCHANGE

    Our Internet service exchanges provide co-location services, Internet
connectivity services, network management services and tools. Our Internet
service exchanges are designed to provide customers with the high performance,
scalability, connectivity, security, reliability and expertise they need to
enhance their business critical Internet applications. We create solutions for
our customers based on their specific business and technical requirements,
modifying the services as each customer's needs evolve. Our Internet related
services are primarily delivered through centralized campuses located near MAE
West and MAE East. Our New York facility is connected to our facility located
near MAE East by high speed, high capacity fiber optic cable. This facility is
intended to facilitate access to European Internet traffic. Our management
services and tools enable us and our customers to continuously manage their
Internet operations jointly, proactively and remotely.

INTERNET CONNECTIVITY

    Our Internet connectivity services are designed to meet the requirements of
high bandwidth, business critical Internet operations by providing highly
reliable, scalable, non-stop and uncongested operations. On September 30, 1999,
AboveNet had peering relationships with more than 270 network providers,
covering over 700 peering points. Any failure by AboveNet to maintain and
increase peering relationships would have a material adverse effect on our
business, results of operations and financial condition.

    Our network is designed to minimize the likelihood of service interruptions.
Each ISX has multiple physical fiber paths into the facility. We maintain
multiple network links from multiple vendors and regularly check that our
network traffic traverses physically separated paths. This network architecture
enhances the availability of a customer's site, even in the event of a link
failure. In addition, since our customers' Internet operations often experience
network traffic spikes due to promotions or events, we have a policy of
maintaining significant excess capacity. We might not be able to expand or adapt
our telecommunications infrastructure to meet additional demand or our
customers' changing requirements on a timely basis and at a commercially
reasonable cost, or at all.

    Our Internet connectivity services are also designed to reduce latency and
to enhance network performance. Our engineering personnel continuously monitor
traffic patterns and congestion points throughout the Internet and dynamically
reroute traffic flows to improve end-user response times. We also enhance
network performance by maintaining what we believe is among the largest number
of direct public

                                      S-47
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and private network peering interconnections in the industry. For customers
seeking a direct communications link to the site of another customer that is
located at the same ISX, we offer highly secure, fast and efficient
cross-connections.

CO-LOCATION SERVICES

    We provide co-location services designed to meet the demands of
sophisticated, multi-vendor business critical Internet operations. We support
most leading Internet hardware and software system vendor platforms, including
those from Ascend Communications, Inc., Nortel Networks, Cisco Systems, Inc.,
Compaq Computer Corporation, Dell Computer Corporation, EMC Corporation,
Hewlett-Packard Company, International Business Machines Corporation, Lucent
Technologies Inc., Microsoft Corporation, Apple Computer, Inc., Network
Appliance, Inc., Silicon Graphics Inc., Sun Microsystems Inc. and 3Com
Corporation. This multi-vendor compatibility enables our customers to retain
control over their choice of technical solution and to integrate their Internet
operations into our existing information technology architecture. Because
business critical Internet operations are dynamic and often require timely
hardware and software upgrades to maintain targeted service levels, customers
have twenty-four hours a day, seven days a week physical and remote access to
the ISX facilities. Additional space and electrical power can be added as needed
in order to provide our customers with access to additional server co-location
services. Customers install and manage their own hardware and software at our
facilities. We do not provide any Web hosting services.

MANAGEMENT SERVICES AND TOOLS

    Our management services and tools support business critical Internet
operations by providing the customer with detailed monitoring, reporting and
management tools to control their hardware, network, software and application
environments. Through our network management services and tools, customers are
able to remotely manage their business critical Internet operations housed at
our ISX facilities. We believe that this provides an important advantage to
enterprises that seek to outsource a portion of their Internet operations and to
link the management of the outsourced operations with in-house operations. Our
proactive management services and tools enable us to identify and resolve
hardware, software, network and application problems, often before the customer
is aware that a problem exists.

INTERNATIONAL INTERNET SERVICE EXCHANGES

    We are seeking to create a global network by investing in joint ventures and
foreign companies that can develop regional Internet service exchanges
internationally. In March 1999, AboveNet entered into agreements with local
partners to establish regional Internet service exchanges in Austria, Germany
and the United Kingdom. We intend to continue to expand our European network
through additional investments in joint ventures in other major business centers
and countries with high levels of Internet traffic. We plan to leverage our
communications infrastructure in Europe, in a similar manner to our market
entrants in the future. We believe that participants in this market must grow
rapidly and achieve a significant presence in the market in order to compete
effectively. We believe that the principal competitive factors in our market are
uncongested connectivity, quality of facilities, level of customer service,
price, the financial stability and credibility of the provider, brand name and
the availability of network management tools. We might not have the resources or
expertise to compete successfully in the future.

TECHNOLOGY

    Our networks consist of fiber optic communications networks which allow for
high speed, high quality transmission of voice, data and video. Fiber optic
systems use laser-generated light to transmit voice, data and video in digital
formats through ultra-thin strands of glass. Fiber optic systems are generally

                                      S-48
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characterized by large circuit capacity, good sound quality, resistance to
external signal interference and direct interface to digital switching equipment
or digital microwave systems. We plan to install backbone fiber optic cables
containing up to 864 fiber optic strands, which have significantly greater
bandwidth than traditional analog copper cables. Using current electronic
transmitting devices, a single pair of glass fibers used by our network can
transmit up to 8.6 gigabits of data per second or the equivalent of
approximately 129,000 simultaneous voice conversations, which is substantially
more than traditional analog copper cable installed in many current
communications networks. We believe that continuing developments in compression
technology and multiplexing equipment will increase the capacity of each fiber
optic strand, thereby providing more bandwidth carrying capacity at relatively
low incremental costs. Our network is capable of using the highest commercially
available capacity transmission (OC-192) and thereby can handle advanced,
capacity-intensive data applications such as voice over Internet Protocol, video
teleconferencing, Frame Relay, ATM, multimedia and Internet-related
applications. In our intra-city networks, we offer end-to-end fiber optic
capacity, capable of utilizing SONET capable ring architecture, which has the
ability to route customer traffic in either direction around its ring design
thereby assuring that fiber cuts do not interrupt service to customers on our
networks. Our networks are also capable of supporting dense wave division
multiplexing (often referred to as "DWDM"). Currently, a state-of-the-art
network operating system continuously monitors and maintains quality control of
networks on a 24-hour basis, alerts us of any degradation or loss of fiber
capacity and pinpoints the location of such degradation. This network operating
system also enables us to repair or replace impaired fiber without any loss of
service. In addition, the monitoring system automatically reroutes traffic in
the event of a catastrophic break in the system, enabling us to ensure that our
customers obtain continuous service.

    Our connectivity services utilize our proprietary ASAP technology to enhance
Internet connectivity by monitoring all of our direct and indirect network
connections for congestion. ASAP automatically monitors all of our major
providers' and peers' direct and indirect connections on a real-time 24-hour
basis to identify congestion. If packet loss and congestion is detected on any
of the links that directly affect customers' performance, our network engineers
are able to dynamically reroute traffic temporarily away from the problem link.
This functionality is particularly important for emerging applications such as
audio and video streaming and voice over the Internet.

FRANCHISE, LICENSE AND RELATED AGREEMENTS

    When we decide to build a fiber optic communications network, our corporate
development staff seeks to obtain the necessary rights-of-way and governmental
authorizations. In some jurisdictions, a construction permit is all that is
required. In other jurisdictions, a license agreement, permit or franchise is
also required. Such licenses, permits and franchises are generally for a term of
limited duration. Where possible, rights-of-way are leased under multi-year
agreements with renewal options and are generally non-exclusive. We lease
underground conduit and pole space and other rights-of-way from entities such as
ILECs, utilities, railroads, IXCs, state highway authorities, local governments
and transit authorities. We strive to obtain rights-of-way that afford us the
opportunity to expand our communications networks as business develops.

SALES AND MARKETING

    Our sales and marketing strategy includes:

    - positioning ourselves as the preferred facilities based provider of
      broadband communications infrastructure and Internet connectivity
      services;

    - focusing on high dollar volume corporate and government customers;

                                      S-49
<PAGE>
    - emphasizing the cost advantages which will allow us to lease our fiber
      optic infrastructure at fixed prices which represent potentially
      significant savings for our large volume carrier and corporate customers
      relative to their present build or buy alternatives;

    - achieve broad market penetration and increase brand recognition for our
      Internet connectivity services among Internet service providers, Internet
      content providers and Web hosting companies; and

    - identify opportunities to cross sell our Internet connectivity services to
      our complementary infrastructure customer base.

    We also believe that communications carriers and corporate and government
customers will be attracted to our dark fiber product and our unmetered pricing
structure. Dark fiber is installed fiber optic cable which is not otherwise
carrying a signal originated by the service provider, such as our company, but
which will carry a signal generated by the customer. We intend initially to
centralize our sales and marketing efforts on carrier customers through a
national sales team and we are currently in the process of hiring additional
sales professionals to focus on these customers. As we have constructed fiber
optic networks in new cities, we have hired sales forces in these areas to
target regional corporate, government and to a lesser extent carrier customers
and we plan to continue this strategy.

    For our Internet connectivity services, we have developed a two-tiered sales
strategy to target leading Internet service providers, Internet content
providers and Web hosting companies through direct sales and channel
relationships. We maintain a direct sales force of highly trained individuals in
San Jose, California and Vienna, Virginia. Our sales force is supported by our
sales engineers and, in many circumstances, by our senior management. We are
also seeking to develop relationships with potential channel partners including
hardware vendors, value added resellers, system integrators, application hosting
and Web hosting companies in order to leverage their sales organizations.

COMPETITION

    Fiber optic systems are currently under construction both locally and
nationally. In New York City, for example, several franchisees have been granted
the right to install and operate a telecommunications network within the city.
Development of fiber optic networks is also continuing on a national scale. The
construction of these networks enables their owners to lease access to their
networks to other communications carriers or large corporate or government
customers seeking high bandwidth capacity, without these customers having to
incur costly expenditures associated with building networks of their own.
Alternatively, some network owners may choose to use their infrastructure to
provide switched voice and data services, competing directly with ILECs and
IXCs. Currently, we do not provide such services or plan to provide such
services.

    In the cities where we plan to deploy fiber optic communications networks,
we face significant competition from the ILECs, which currently dominate their
local communications markets. We also face competition from CLECs and other
potential competitors in these markets and will face competition in the cities
in which we plan to build our networks. Many of our competitors have financial,
management and other resources substantially greater than ours, as well as other
competitive advantages over us, including established reputations in the
communications market.

    Various communications carriers already own fiber optic cables as part of
their communications networks. Accordingly, each of these carriers could, and
some do, compete directly with us in the market for leasing fiber capacity. In
addition, although CLECs generally provide a wider array of services to their
customers than we presently provide to our customers, CLECs nevertheless
represent an alternative means by which our potential customer could obtain
direct access to an IXC POP or other site of the customer's choosing. Thus,
CLECs could compete with us.

                                      S-50
<PAGE>
    Some communications carriers and local cable companies have extensive
networks in place that could be upgraded to fiber optic cable, as well as
numerous personnel and substantial resources to undertake the requisite
construction to so equip their networks. To the extent that communications
carriers and local cable companies decide to equip their networks with fiber
optic cable, they are potential direct competitors provided that these
competitors are willing to offer this capacity to all of their customers.

    We believe that as competition in the local exchange market develops, a
fundamental division between the needs of corporate, governmental and
institutional end users and residential end users will drive the creation of
differentiated communications services and service providers. We believe that
the CLECs, IXCs, ISPs, wireless carriers and corporate and government customers
on which we focus will have distinct requirements, including maximum
reliability, consistent high quality transmissions, capacity for high-speed data
transmissions, diverse routing and responsive customer service. We believe that
we will be able to satisfy the needs of such customers.

    Our Internet connectivity services business is intensely competitive. There
are few substantial barriers to entering the co-location service business, and
we expect that we will face additional competition from existing competitors and
new market entrants in the future. We believe that participants in this market
must grow rapidly and achieve a significant presence in the market in order to
compete effectively. We believe that the principal competitive factors in this
market are uncongested connectivity, quality of facilities, level of customer
service, price, the financial stability and credibility of the provider, brand
name and the availability of network management tools. AboveNet might not have
the resources or expertise to compete successfully in the future. Our current
and potential competitors in this market include:

    - providers of co-location services, such as Exodus Communications, Inc.,
      Frontier Corporation, which has entered into an agreement to be acquired
      by Global Crossing Ltd., Hiway Technologies, Inc., which was acquired by
      Verio Inc., and Globix Corporation;

    - national and regional ISPs, such as Concentric Network Corporation,
      PSINet, Inc., MCI WorldCom and certain subsidiaries of GTE Corporation;

    - global, regional and local telecommunications companies, such as Sprint,
      MCI WorldCom and Regional Bell Operating Companies, some of whom supply
      capacity to AboveNet; and

    - large information technology outsourcing firms, such as International
      Business Machines Corporation and Electronic Data Systems.

REGULATION

    As a provider of communications facilities, we are subject to varying
degrees of regulation in each of the jurisdictions in which we operate. In the
United States, some aspects of our services are regulated by the Federal
Communications Commission (the "FCC") and various state regulatory bodies. In
some local jurisdictions, we must obtain approval to operate or construct our
networks. In other countries where we operate we may also be subject to
regulations by the agencies having jurisdiction over the provision of
telecommunications services.

    FEDERAL

    In the United States, federal telecommunications law directly shapes the
market in which we compete. We offer two types of services--the leasing of dark
fiber and the provision of telecommunications transmission services--that are
subject to varying degrees of regulation by the FCC pursuant to the provisions
of the Communications Act of 1934, as amended, including by the
Telecommunications Act of

                                      S-51
<PAGE>
1996 (the "Communications Act"), and the FCC regulations implementing and
interpreting the Communications Act.

    The Communications Act imposes legal requirements on "common carriers" who
engage in "interstate or foreign communication by wire or radio" and on
"telecommunications carriers." Telecommunications carriers, or common carriers,
are providers of telecommunications services, which is defined by the
Communications Act as the offering of telecommunications for a fee "directly to
the public" or to all potential users of an indiscriminate basis subject to
standardized rates, terms, and conditions.

    DARK FIBER LEASING.  We believe that we are not a "telecommunications
carrier" or "common carrier" with respect to our leasing of dark fiber
facilities, and therefore that our dark fiber activities are not subject to
special legal requirements applicable to such carriers. First, we do not believe
that the leasing of dark fiber is a "telecommunications service" that is subject
to FCC regulation. The FCC generally regulates "communication by wire or radio"
or the "transmission" of "information of the users' choosing," neither of which
describes the leasing of dark fiber facilities. Second, we do not offer dark
fiber facilities as a common carrier, I.E., to all potential users on an
indiscriminate basis. Instead, we enter into individualized negotiations on a
selective basis with prospective lessees of our dark fiber facilities to
determine whether and on what terms to serve each potential lessee. Our dark
fiber offerings should therefore not be subject to the common carrier
jurisdiction of the FCC or to the common carrier provisions of the
Communications Act.

    If our offering of dark fiber facilities were deemed to constitute
"telecommunications," then our revenues from such leases to end users (but not
to other telecommunication carriers), whether or not provided on a common
carrier basis, would become subject to assessment for the FCC's Universal
Service Fund, a fund that was established by the FCC pursuant to the
Telecommunications Act of 1996 (the "1996 Act") to assist in ensuring the
universal availability of basic telecommunications services at affordable
prices, and other FCC assessments. The FCC announced that the rate of assessment
will be approximately 3.9% of gross interstate and 1% of gross intra-state
end-user revenues for the third quarter of 1999. On July 30, 1999, the U.S.
Court of Appeals for the Fifth Circuit upheld in part the FCC's order but
determined that assessments must be limited to interstate revenues. We cannot
predict the effect of this ruling on the rate of assessment, or what rates of
assessment will apply in future years. We may also be liable for assessments by
state commissions for state universal service programs.

    TRANSMISSION SERVICES.  With respect to our offering of telecommunications
services, however, we will likely operate as a common carrier, offering such
transmission services to all potential users indiscriminately, and therefore
will be subject to the regulatory requirements applicable to common carriers and
to telecommunications carriers. For example, we will be required, with respect
to our transmission services, to (1) provide such services indiscriminately upon
any reasonable request; (2) charge rates and adopt practices, classifications
and regulations that are just and reasonable; and (3) avoid unreasonable
discrimination in charges, practices, regulations, facilities and services. We
may also be required to file tariffs setting forth the rates for our services.
Under current FCC policies, these regulatory requirements should not impose any
substantial burdens on us. The FCC has recently determined, for example, that
providers of "access" services (intracity transmission services used to
originate and/or terminate interstate and foreign communications) need not file
tariffs and may offer such services to customers on a private, contractual
basis. Our revenues from transmission services will also be subject to FCC
Universal Service Fund assessments as discussed above, to the extent that these
services are purchased by end users. Since the revenues of our competitors will
be subject to comparable assessments, this should not reduce our
competitiveness. Also, being regulated as a "telecommunications carrier" will
give us certain legal benefits. In particular, we will be entitled, like other
competitive local exchange carriers (often referred to as "CLECs"), to insist
upon access to the existing telecommunications infrastructure by interconnecting
our fiber-optic networks with incumbent local exchange carriers (often referred
to as "ILECs") central offices

                                      S-52
<PAGE>
and other facilities. Under the 1996 Telecom Act, ILECs must, among other
things: (i) allow interconnection at any technically feasible point and provide
service equal in quality to that provided to others, (ii) provide unbundled
access to network elements, and (iii) provide access to their poles, ducts,
conduits and other rights-of-way. Our rights as a CLEC may not extend to cover
our dark fiber business (unless our dark fiber business is considered a
telecommunications service). Accordingly, an ILEC may refuse to interconnect
with (or provide the collocation described below) us other than in connection
with our transmission services business.

    ILECs must also provide "physical collocation" for other telecommunications
carriers. Physical collocation is an offering by an ILEC that enables another
telecommunications carrier to enter the ILEC's premises to install, maintain and
repair its own equipment that is necessary for interconnection or access to the
ILEC's network elements. An ILEC is required to allocate reasonable amounts of
space to carriers on a first-come first-served basis. If space limitations or
practical or technical reasons prohibit physical collocation, an ILEC must offer
"virtual collocation," by which the other carrier may specify ILEC equipment to
be dedicated to its use and electronically monitor and control communications
terminating in such equipment. We intend, in some instances, to collocate
portions of our network on the premises of certain ILECs. Our ability to do this
on a cost-effective basis will depend on the rates, terms and conditions
established for collocation, which will be established by state regulators in
arbitration proceedings and therefore may vary from one state to the next.

    The FCC has responsibility under the 1996 Telecom Act's interconnection
provisions to determine what elements of an ILEC's network must be provided to
competitors on an unbundled basis. The FCC declared dark fiber an unbundled
network element under these provisions. The FCC's requirements for unbundling
were overturned by the Supreme Court, which ordered the FCC to re-evaluate the
standard it uses to determine which network elements need to be unbundled. In
response, the FCC recently issued an order affirming all but one of the network
elements and also stating for the first time that ILECs must provide access to
dark fiber as a separate element. In addition, federal district courts in a
number of jurisdictions have interpreted the 1996 Telecom Act to include dark
fiber as a network element, which must be unbundled. The FCC decision to treat
dark fiber as an unbundled element, as well as these court rulings, could
decrease the demand for dark fiber provided by us because our potential
customers will be able to obtain dark fiber from ILECs at cost-based rates. In
addition, the FCC has announced that state commissions may decide to add network
elements to the FCC's list of elements that are required to be unbundled by
carriers.

    ILECs, CLECs and inter-exchange carriers (often referred to as "IXCs") are
subject to other requirements under the Communications Act, the FCC regulations
and additional federal telecommunications laws. These requirements may affect
our business by virtue of the inter-relationships that exist among us and many
of these regulated telecommunications carriers. For example, the FCC recently
issued an order requiring, among other things, that access charges (fees charged
by ILECs to IXCs for use of local telephone facilities for the origination and
termination of long-distance calls) shift in part from being usage driven to a
fixed flat cost-based structure. The FCC recently issued an order granting ILECs
greater pricing flexibility for their access services (both switched and
non-switched), which may permit the ILECs to compete more effectively against
some of our service offerings. While it is not possible to predict the precise
effect the access charge changes will have on our business or financial
condition, the reforms will reduce access charges paid by IXCs, likely making
the use of ILEC facilities by IXCs more attractive, which could have a material
adverse effect on the use of our fiber optic telecommunications networks by
IXCs. Bell Atlantic's proposed investment could subject us to additional
regulation by the FCC. Bell Atlantic is an ILEC and pursuant to the
Communications Act may not provide long distance service within its geographic
region until certain conditions are met. Companies in which an ILEC owns greater
than a ten percent ownership interest are subject to the same prohibitions. If
such prohibitions applied to us it would have a material adverse effect on our
business. For that reason, our agreement with Bell Atlantic

                                      S-53
<PAGE>
prohibits it from owning more than ten percent of us until the long-distance
prohibitions no longer apply to Bell Atlantic and its affiliates.

    STATE

    The 1996 Telecom Act prohibits state and local governments from enforcing
any law, rule or legal requirement that prohibits, or has the effect of
prohibiting, any person from providing any interstate or intrastate
telecommunications service. Nonetheless, this provision of the 1996 Telecom Act
should enable us and our customers to provide telecommunications services in
states that previously prohibited competitive entry.

    However, states retain jurisdiction, under the 1996 Telecom Act to, adopt
regulations necessary to preserve universal service, protect public safety and
welfare, manage public rights of way, ensure the continued quality of
communications services and safeguard the rights of consumers.

    States continue to determine the rates that ILECs can charge for most of
their intrastate services. They are also responsible for mediating and
arbitrating ILEC interconnection arrangements with other carriers if voluntary
agreements are not reached. Accordingly, state involvement in local
telecommunications services is substantial.

    Each state (and the District of Columbia, which is treated as a state for
the purpose of regulation of telecommunications services) has its own statutory
scheme for regulating providers of telecommunications services of they are
"common carriers" or "public utilities". As with the federal regulatory scheme,
we believe that the offering of dark fiber facilities does not make us of common
carrier or public utility so we would not be subject to this type of regulation
in most jurisdictions in which we currently have or plan to construct
facilities. Our offering of transmission services (as distinct from dark fiber
capacity), however, will likely be subject to regulation in each of these
jurisdictions to the extent that these services are offered for intra-state use.
Even though our facilities will be physically located in individual states, we
anticipate that most customers will use our facilities and services for the
purpose of originating and/or terminating interstate and foreign communications.
Under current FCC policies, any dedicated transmission service or facility that
is used more than 10% of the time for the purpose of inter-state or foreign
communication is subject to FCC jurisdiction to the exclusion of any state
regulation.

    State regulation of the telecommunications industry is changing rapidly, and
the regulatory environment varies substantially from state to state. Our
subsidiaries are currently authorized to provide intrastate telecommunications
services in California, Colorado, Connecticut, Delaware, District of Columbia,
Florida, Georgia, Illinois, Maryland, Massachusetts, Missouri, New Jersey, New
York, Oregon, Pennsylvania, Rhode Island, Texas, Virginia, Washington and have
applications pending in Arizona, Minnesota and Ohio. At present, we do not
anticipate that the regulatory requirements to which we will be subject in the
states in which we currently intend to operate will have any material adverse
effect on our operations. These regulations may require, among other things,
that we obtain certification to operate, and that we provide notification of, or
obtain authorization for, certain corporate transactions, such as the
transaction with Bell Atlantic. In any event, we will incur certain costs to
comply with these and other regulatory requirements such as the filing of
tariffs, submission of periodic financial and operational reports to regulators,
and payment of regulatory fees and assessments, including contributions to state
universal service programs. In some jurisdictions, our pricing flexibility for
intra-state services may be limited because of regulation, although our direct
competitors will be subject to similar restrictions. However, we make no
assurances that future regulatory, judicial, or legislative action will not
materially adversely affect us.

                                      S-54
<PAGE>
    Bell Atlantic recently filed an application with the FCC to provide long
distance service in New York on the grounds that it provides access and
interconnection to its network facilities for the network facilities of one or
more unaffiliated competing providers of telecommunications services. The FCC
has until the end of 1999 to approve the application. We hope that Bell Atlantic
will be a significant customer of ours when it enters the long distance market.

    LOCAL

    In addition to federal and state laws, local governments exercise legal
authority that affect our business. For example, local governments, such as the
City of New York, typically retain the ability to manage public rights-of-way,
subject to the limitation that local governments may not prohibit persons from
providing telecommunications services and local governments may not treat
telecommunication service providers in a discriminatory manner. Because of the
need to obtain approvals, local authorities affect the timing and costs
associated with our use of public rights-of-way. In addition, some local
authorities must approve or be notified of certain corporate transactions, such
as the Bell Atlantic transaction. These regulations may have an adverse effect
on our business.

    FEDERAL REGULATION OF INTERNATIONAL SERVICE

    Various regulatory requirements and limitations also will influence our
business as we enter the market for international telecommunications service. We
have entered into a 50/50 joint venture, ION, with a subsidiary of Racal that
contemplates jointly acquiring and selling international, facilities-based
telecommunications capacity between the U.S. and the United Kingdom and possibly
between the U.S. and other markets. ION is a U.S. international common carrier
subject to U.S. regulation under Title II of the Communications Act, and, we are
also a U.S. international common carrier subject to the same regulations. Under
current FCC rules, international carriers that do not exercise market power and
that are not affiliated with dominant foreign carriers (carriers possessing
market power in their local markets) are subject to relatively relaxed U.S.
regulation as nondominant international carriers. As a non-dominant common
carrier, ION and we are subject to, among other policies, the common carrier
obligation of nondiscrimination. In addition, FCC rules prohibit U.S. carriers
from bargaining for special concessions from certain foreign partners. ION and
we are required, under Sections 214 and 203 of the Communications Act to obtain
authorization and file an international service tariff containing rates, terms
and conditions prior to initiating service. As a nondominant carrier, ION and we
are eligible to seek "global" authorization under Section 214 to operate as
facilities-based and/or resale carrier. International carriers are also subject
to certain annual fees and filing requirements, such as the requirement to file
contracts with other carriers, including foreign carrier agreements, and reports
setting forth international circuit, traffic and revenue data. Failure to obtain
an appropriate U.S. license for international service or the revocation of a
license could materially adversely affect our future operations.

    Until recently, international common carriers were also required to comply
with the FCC's International Settlements Policy which defines the permissible
boundaries for U.S. carriers and their foreign correspondents to settle the cost
of terminating each other's traffic over their respective networks. The FCC,
however, recently decided that it is no longer necessary to apply the
International Settlement Policy rules to U.S. carrier arrangements with
non-dominant foreign carriers and with arrangements with all foreign carriers in
competitive foreign markets. Since the U.S.-UK route has been declared
competitive by the FCC, we and ION will not have to comply with the
International Settlement Policy.

    The FCC has also made significant changes to other aspects of its
international regulatory regime that facilitate our international operations.
For example, it has approved the provisions of switched services over private
lines ("ISR") interconnected with the public switched network between the United
States and 22 other countries, including the UK and Germany. Recently, the FCC
took steps to streamline the application process for authority to provide
international services, relaxing further the rules for almost all international
services to almost all countries (with China, Taiwan, Russia, Saudi Arabia, the
notable exceptions). The FCC continues to refine its international service
rules to promote competition, reflect

                                      S-55
<PAGE>
and encourage liberalization in foreign countries, and reduce accounting rates
toward cost. We are unable to predict how the FCC will resolve the various
pending international policy issues and the effect of such resolutions on us.

REGULATION OF INTERNATIONAL OPERATIONS

    Our international services are also subject to regulation in other countries
where we operate. Such regulation, as well as policies and regulations on the
European Union level, may impose separate licensing, service and other
conditions on our international service operations, and these requirements may
have a material adverse effect on our ability to operate. In addition to our
joint venture, ION, we have entered into a joint venture with Carrier 1 and
Viatel to develop a fiber network linking Germany's main cities. We also have an
agreement with Viatel to use Viatel's network in France, Germany, the UK and the
Netherlands. The following discussion is intended to provide a general outline
of certain regulations and current regulatory posture in certain foreign
jurisdictions in which we currently operate or intend to operate, and is not
intended as a comprehensive discussion of such regulations or regulatory
posture. Local laws and regulations differ significantly among these
jurisdictions, and, within such jurisdictions, the interpretation and
enforcement of such laws and regulations can be unpredictable.

    THE EUROPEAN UNION

    The European Union (the "EU") was established by the Treaty of Rome and
subsequent treaties. EU member states are required to implement directives
issued by the European Commission (the "EC") and the European Council by passing
national legislation. The EC and European Council have issued a number of key
directives establishing basic principles for the liberalization of the EU
telecommunications market. This basic framework has been advanced by a series of
harmonization directives, which include the so-called Open Network Provision
directives and the Licensing Directive of April 1997 and the Interconnection
Directive of June 1997, which address the procedures for granting license
authorizations and conditions applicable to such licenses and the
interconnection of networks and the interoperability of services as well as the
achievement of universal service. The Licensing Directive sets out framework
rules for the procedures associated with the granting of national authorizations
for the provision of telecommunications services and for the establishment or
operation of any infrastructure for the provision of telecommunications
services. It distinguishes between "general authorizations," which should
normally be easier to obtain since they do not require an explicit decision by
the national regulatory authority, and "individual licenses." EU member states
may impose individual license requirements for the establishment and operation
of public telecommunications networks and for the provision of voice telephony,
among other things. Consequently, ION's operations in the U.K., our operation
with respect to the German Network and European Network and our proposed
operations may require that ION or the Company, respectively, be subject to an
individual licensing system rather than to a general authorization in the
majority of EU member states. In some countries where we operate, we may also be
required to contribute to a fund for the provision of universal service. The
United Kingdom and each other EU member state in which ION currently conducts or
we conduct our business has a different regulatory regime and such differences
are expected to continue. The requirement that ION, our former joint venture, or
we obtain necessary approvals varies considerably from country to country.

    UNITED KINGDOM

    The Telecommunications Act of 1984 (the "U.K. Act") provides a licensing and
regulatory framework for telecommunications activities in the United Kingdom.
The Secretary of State for Trade and Industry at the Department of Trade and
Industry (the "Secretary of Trade") is responsible for granting licenses under
the U.K. Act and for overseeing telecommunications policy, while the Director
General of Telecommunications (the "Director General") and his office (the
Office of Telecommunications ("OFTEL")) are responsible, among other things, for
enforcing the terms of such licenses. Operators wishing to use their own
facilities to provide international services were until recently required to
obtain an International

                                      S-56
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Facilities License ("IFL"). An IFL authorized the running of telecommunication
systems within the U.K. and permitted the licensee to connect U.K. systems to
overseas systems, and to offer international services. ION obtained an IFL on
December 9, 1998.

    On September 27, 1999, the Telecommunications (licence Modification) (Fixed
Voice Telephony and International Facilities Operator Licences) Regulations 1999
(the "Regulations") came into force. The Regulations implemented the
requirements of the Licensing Directive and converted existing IFLs, into Public
Telecommunications Operator Licenses ("PTO Licenses") which now include an
authorization for the provision of international facilities. Under its new PTO
License, ION is also entitled to offer domestic telecommunications services.
Metromedia Fiber Network UK Limited ("MFN UK"), which was incorporated by us in
the United Kingdom on March 4, 1999 was awarded a PTO license on October 7,
1999. MFN UK will be used as the operating company in the United Kingdom and has
been granted code powers which gives it statutory rights of way over land which
overide private rights.

    With effect from June 30, 1999, it is no longer necessary to hold an
individual telecommunications license to have interconnection rights. Similarly,
it is no longer necessary for an operator to build its own infrastructure to be
included within the "Annex II list" of operators with rights and obligations to
interconnect pursuant to the Interconnection Directive. Any operator who appears
on the Annex II list on the OFTEL web-site (www.oftel.gov.uk) has the right to
negotiate interconnection as well as a corresponding obligation to negotiate
interconnection with any other operator in Annex II. The terms, conditions and
charges to be applied to interconnection between operators who do not have
significant market power are not specifically regulated and are therefore
subject to commercial agreement. All Annex II operators are eligible to benefit
from the terms and conditions and charges which fixed-line operators with
significant market power are obliged to offer by the Interconnection Directive.
In the United Kingdom, British Telecommunications and Kingston Communications
have significant market power for the provision of fixed networks and services
and leased lines. ION is included in the Annex II list of operators on OFTEL's
web-site and therefore has a right coupled with a corresponding obligation to
negotiate interconnection with any other operator on the Annex II list. MFN UK
is not currently included in the Annex II list but may apply to OFTEL to be
included in the list.

    The U.K. Government passed a Competition Act in November 1998 which grants
concurrent powers to the industry specific regulators and the Director General
of Fair Trading for the enforcement of prohibitions against anti-trust behavior
modeled on Articles 81 and 82 of the Treaty of Rome. The Act introduces into
U.K. legislation prohibitions on the abuse of a dominant position and
anti-competitive agreements, and provides for third party rights of action,
stronger investigative powers, interim measures and effective enforcement
powers. The prohibitions are expected to come into force on March 1, 2000. The
Act gives the Director General power to exercise concurrent powers with the
Director General of Fair Trading in relation to "commercial activities connected
with telecommunications." The Act enables third parties to bring enforcement
actions directly against telecommunications operators who are in breach of the
prohibitions contained in the Act and seek damages rather than have to wait for
the Director General to issue an enforcement order. Depending on how these
provisions of the Act are implemented, it may give us and our competitors
greater ability to challenge anti-competitive behavior in the U.K.
telecommunications market.

    GERMANY

    The German Telecommunications Act of July 25, 1996 (the "German
Telecommunications Act") liberalized all telecommunications activities. Under
the German Telecommunications Act, voice telephony was liberalized as of January
1, 1998. The German Telecommunications Act has been complemented by several
Ordinances. The most significant Ordinances concern license fees, rate
regulation, interconnection, universal service, frequencies and customer
protection. Under the German regulatory scheme, licenses can be granted within
four license classes. A license is required for operation of transmission lines
that extend beyond the limits of a property and that are used to provide
telecommunications services for the general public. The licenses required for
the operation of transmission lines are divided into 3 infrastructure

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license classes: mobile telecommunications (license class 1); satellite (license
class 2); and telecommunications services for the general public (license class
3). The provision of dark fiber does not require a license. Beside the
infrastructure licenses, an additional license is required for provision of
voice telephony services on the basis of self-operated telecommunications
networks (license class 4). A class 4 license does not include the right to
operate transmission lines. According to the License Fees Ordinance, a
nationwide class 4 license costs a one-time fee of DM 3,000,000. The costs for a
territorial class 3 license will be determined by the Regulierungsbehorde fur
Telekommunikation und Post (the "RegTP") and is dependent on the population and
the geographical area covered by the territorial class 3 license. A nationwide
territorial class 3 license costs DM 10,600,000. The Administrative Court of
Cologne held in a preliminary ruling that there is a high probability that the
license fees are excessive and that therefore the Ordinance might be void. The
RegTP does not invoice any license fees at the present time in view of the
pending administrative court procedure. Since we have not yet received a license
fee order, it is presently unclear what the amount of our license fee will be.
Licensees that operate transmission lines crossing the boundary of a property
have the right to install transmission lines on, in and above public roads,
squares, bridges and public waterways without payment; however, when installing
transmission lines a planning agreement must be obtained from the relevant
authorities.

    A company which operates a public telecommunications network has the right
to receive favorable interconnection rates from Deutsche Telekom, as a dominant
carrier. If the company does not agree with the offered rates or Deutsche
Telekom refuses to interconnect for whatever reason, the company can refer the
case to the RegTP which shall decide upon the request for interconnection within
a period of six weeks; if the RegTP decides to extend this deadline, it must at
the latest decide within ten weeks of the request. Whether, and under which
conditions, carrier to carrier operators will receive favorable interconnection
rates or less favorable "special network access rates" from Deutsche Telekom
depends on whether they operate a "public telecommunications network."

    According to the regulatory authority, a public telecommunication network
consists of at least one switch and three transmission lines. Therefore, a
carrier with this minimal network configuration has the right to interconnect
with Deutsche Telekom or other operators of public telecommunications networks.
Deutsche Telekom has terminated its Interconnection Agreements with most of the
carriers and is now imposing, in its new standard interconnection contracts,
additional interconnection conditions. Deutsche Telekom demands inter alia, that
carriers which do not meet certain minimum traffic requirements must pay a
stipulated penalty. In addition, Deutsche Telekom requests a minimum lease
period for interconnection access points (often referred to as "ICA") of
24 months. If traffic at one point of interconnection exceeds 48.8 Erlang,
Deutsche Telekom requests the establishment of additional points of
interconnection up to a maximum of 23 points of interconnection. It is presently
unclear whether or not these and other interconnection conditions will be upheld
by the regulatory authority or the courts.

    The rates of Deutsche Telekom's services in conjunction with interconnection
and special network access are subject to regulatory approval; this approval is
typically granted for a limited period of time. The current approval expires on
December 31, 1999. It is uncertain which interconnection rates will apply to the
next year.

    Licensed operators are under an obligation to present their standard terms
and conditions (with regard to the provision of telecommunications services for
the public) to the RegTP. The RegTP may, based upon certain criteria decide not
to accept these terms and conditions. We may become subject to universal service
financing obligations. Currently, it is unlikely that the universal service
financing system will be implemented in Germany in the foreseeable future. These
obligations do not apply as far as the provision of mere dark fiber is
concerned.

    Metromedia Fiber Network GmbH has obtained a class 3 license for the whole
territory of Germany. In addition, Metromedia Fiber Network GmbH has concluded
frameworks agreements with the cities of Frankfurt, Stuttgard and Cologne on the
conditions and procedures for obtaining the necessary planning agreements with
the city authorities.

                                      S-58
<PAGE>
    OTHER COUNTRIES

    In addition to our United Kingdom and German operations, we have
incorporated local subsidiaries in Belgium, France and The Netherlands. We are
currently in the process of incorporating local subsidiaries in Austria, The
Czech Republic, France, Hungary, Ireland, Italy, Japan, Spain and Switzerland.
In the Netherlands, the local subsidiary has registered with the Dutch
regulator. We are in the process of applying, through our local subsidiaries,
for necessary licenses and registrations in the other above mentioned countries
to enable us to provide dark fiber and DWDM services.

EMPLOYEES

    As of September 30, 1999, we employed 529 people, including 262 in
engineering and construction, 168 in sales and marketing and 99 in
administration. Our employees are not represented by any labor union. We
consider our relationship with employees to be good.

PROPERTIES

    Our principal properties currently are the NY Network and its component
assets. We own substantially all of the communications equipment required for
our business. Our installed fiber optic cable is laid under the various
rights-of-way held by us. Please refer to the section of this prospectus
supplement entitled "--Build-out of Networks--Rights-of-Way." Our other fixed
assets are located at various leased locations in the geographic areas that we
serve. Our executive and administrative offices are located at our principal
office at One North Lexington Avenue, White Plains, New York. We lease this
space (currently approximately 21,000 square feet) under an agreement that
expires in March 2003. Our sales offices are located at 685 Third Avenue, New
York, New York. We lease this space (approximately 9,670 square feet) under an
agreement that expires in September 2003. We lease additional space (currently
8,710 square feet) at 60 Hudson Street, New York, New York, from Hudson
Telegraph Associates under an agreement that expires in March 2010.

    AboveNet's executive and administrative offices are located at 50 West San
Fernando Street, San Jose, California. We lease this space (approximately 19,850
square feet) under an agreement that expires in February 2008. Palo Alto
Internet Exchange's executive and administrative offices are located at 285
Hamilton Avenue, Palo Alto, California (approximately 5,130 square feet) under
an agreement that expires in January 2007. In addition, AboveNet and Palo Alto
Internet Exchange lease various co-location facilities in California, Virginia
and New York that range from 10,000 to 29,000 square feet under agreements that
expire within the next 10 to 20 years.

LEGAL PROCEEDINGS

    On or about October 20, 1997, Vento & Company of New York (referred to as
"VCNY") commenced an action against us, Stephen A. Garofalo, Peter Silverman,
the law firm of Silverman, Collura, Chernis & Balzano, P.C., Peter Sahagen,
Sahagen Consulting Group of Florida (collectively, the "Sahagen Defendants") and
Robert Kramer, Birdie Capital Corp., Lawrence Black, Sterling Capital LLC,
Penrush Limited, Needham Capital Group, Arthur Asch, Michael Asch and Ronald
Kuzon (the "Kramer Defendants") in the United States District Court for the
Southern District of New York (No. 97 CIV 7751) (the "VCNY Litigation"). On or
about May 29, 1998, VCNY filed an amended complaint. On or about July 2, 1999,
VCNY filed a second amended complaint. In its complaint, as amended, VCNY
alleges seven causes of action in connection with its sale of 900,000 shares
(not adjusted for subsequent stock splits) of class A common stock to Peter
Sahagen and the Kramer Defendants on January 13, 1997. The seven causes of
action include: (i) violation of Section 10(b) of the Securities Exchange Act of
1934 and Rule 10b-5 promulgated under such Act; (ii) fraud and fraudulent
concealment; (iii) breach of fiduciary duty; (iv) negligent misrepresentation
and omission; and (v) breach of contract. VCNY is seeking, among other things,
rescission of the VCNY Sale, or alternatively, damages in an amount which cannot
currently be ascertained but VCNY contends to be in excess of $460 million,
together with interest. VCNY is also seeking unspecified punitive damages,
reasonable legal fees and the cost of this action. All the defendants,

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including us and Stephen A. Garofalo, have moved for summary judgment on VCNY's
second amended complaint.

    On or about June 12, 1998, Claudio E. Contardi commenced an action against
Peter Sahagen, Sahagen Consulting Group of Florida and the Company in the United
States District Court for the Southern District of New York (No. 98 CIV 4140).
Mr. Contardi alleges a cause of action for, among other things, breach of a
finder's fee agreement entered into between Mr. Sahagen and Mr. Contardi on or
about November 14, 1996 and breach of an implied covenant of good faith and fair
dealing contained in the finder's fee agreement. Mr. Contardi is seeking, among
other things, a number of shares of the Company which we cannot currently
ascertain but believe to be approximately 112,500 shares (calculated as of the
date on which the complaint was filed) or damages in an amount which we cannot
currently ascertain but believe to be approximately $4.9 million (calculated as
of the date on which the complaint was filed) and all costs and expenses
incurred by him in this action. We have filed an answer to the complaint and
have raised affirmative defenses. We have moved for summary judgment on the
complaint.

    We intend to vigorously defend both these actions because we believe that we
acted appropriately in connection with the matters at issue in these two cases.
However, we can make no assurances that we will not determine that the
advantages of entering into a settlement outweigh the risk and expense of
protracted litigation or that ultimately we will be successful in defending
against these allegations. If we are unsuccessful in defending against these
allegations, an award of the magnitude being sought in the VCNY Litigation would
have a material adverse effect on our financial condition or results of
operations.

    We were a defendant in Howard Katz, et al. v. Metromedia Fiber Network,
Inc., et al., No. 97 Civ. 2764 (the "Katz Litigation"). In their second amended
complaint, Howard Katz, Realprop Capital Corporation and Evelyn Katz
(collectively, the "Katz Entities") alleged causes of action against our
company, Stephen A. Garofalo, Peter Sahagen, Peter Silverman, Silverman,
Collura, Chernis & Balzano, P.C. and Metromedia Company, in connection with the
repurchase of the Katz Securities, as defined, for, among other things, common
law fraud, violations of Section 10(b) of the Securities Exchange Act of 1934
and Rule 10b-5 promulgated under such Act, breach of fiduciary duty and
negligent misrepresentation. In March 1998, we entered into a settlement
agreement with the Katz Entities which, among others, settled and resulted in
the dismissal of the Katz Litigation.

    On June 29, 1999 , an alleged stockholder of AboveNet filed a lawsuit,
captioned KAUFMAN V. TUAN, ET AL, Del. Ch. C.A. No. 17259NC, in the Court of
Chancery of the State of Delaware in and for the New Castle County. The
plaintiff, who purports to represent a class of all AboveNet stockholders,
challenges the terms of the proposed merger between the Company and AboveNet.
The complaint names, as defendants, AboveNet, the directors of AboveNet, and the
Company (as an aider and abettor). The complaint alleges generally that
AboveNet's directors breached their fiduciary duty to stockholders of AboveNet,
and seeks an injunction against the merger, or, in the alternative, rescission
and the recovery of unspecified damages, fees and expenses. AboveNet, the
Company and the individual defendants believe the lawsuit is without merit and
intend to defend themselves vigorously. AboveNet and the individual director
defendants' responses were filed on July 22, 1999. In connection with these
responses, a motion to dismiss the complaint in its entirety and a motion to
stay discovery pending the outcome of the motion to dismiss were filed by the
AboveNet and the individual directors of AboveNet on July 22, 1999. Similar
motions to dismiss the complaint and stay discovery were filed by the Company on
July 26, 1999.

    Four other complaints, which are virtually identical to the complaint in
KAUFMAN V. TUAN, have also been filed in the Delaware Court of the Chancery.
None of these four complaints have been served. The four actions are captioned
BROSIOUS V. TUAN, ET AL, Del. Ch. C.A. No. 17271NC, CHONG V. TUAN, ET AL, Del.
Ch. C.A. No. 17281NC, EHLERT V. TUAN, ET AL, Del. Ch. C.A. No. 17284NC, HORN V.
TUAN, ET AL, Del. Ch. C.A. No. 17300NC.

    In addition, we are subject to various claims and proceedings in the
ordinary course of business. Based on information currently available, we
believe that none of such current claims, or proceedings, individually or in the
aggregate, including the VCNY litigation and the Contardi litigation, will have
a material adverse effect on our financial condition or results of operations,
although we can make no assurances in this regard.

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<PAGE>
                                   MANAGEMENT

    The directors and executive officers of our company and their ages as of the
date of this prospectus supplement are as follows:

<TABLE>
<CAPTION>
NAME                           AGE                            POSITION HELD
- ----                         --------                         -------------
<S>                          <C>        <C>
Stephen A. Garofalo........     48      Chairman of the Board and Chief Executive Officer
Howard M. Finkelstein......     46      President, Chief Operating Officer and Director
Vincent A. Galluccio.......     53      Senior Vice President and Director
Gerard Benedetto...........     42      Senior Vice President--Chief Financial Officer
Nicholas M. Tanzi..........     40      Senior Vice President--Sales and Marketing
Silvia Kessel..............     49      Executive Vice President and Director
John W. Kluge..............     85      Director
David Rand.................     36      Director; Chief Technology Officer of AboveNet
David Rockefeller..........     83      Director
Stuart Subotnick...........     56      Director
Sherman Tuan...............     45      Director; Chief Executive Officer of AboveNet
Arnold L. Wadler...........     56      Executive Vice President, General Counsel, Secretary and
                                        Director
Leonard White..............     60      Director
</TABLE>

    STEPHEN A. GAROFALO founded our company in April 1993. Mr. Garofalo has been
serving as Chairman of the Board of Directors since our inception and as Chief
Executive Officer since October 1996. Mr. Garofalo served as President from 1993
to 1996 and as Secretary from 1993 to 1997. From 1979 to 1993 Mr. Garofalo
served as president and chief executive officer of F. Garofalo Electric Co.,
Inc., an electrical contractor.

    HOWARD M. FINKELSTEIN has been President, Chief Operating Officer and a
Director of our company since April 1997. Prior to joining our company,
Mr. Finkelstein was employed by various affiliates of Metromedia Company for 16
years. His most recent position was as executive vice president and chief
operating officer of Metromedia International Telecommunications, Inc. From 1984
to 1993, Mr. Finkelstein served as president of Metromedia Communications
Corporation, a national long distance telecommunications carrier. In addition,
Mr. Finkelstein served as executive vice president and chief operating officer
of Metromedia Restaurant Group from 1993 to 1995. Mr. Finkelstein is a director
of Multimedia Medical Systems, Incorporated, a privately held company.

    VINCENT A. GALLUCCIO has been a Director of our company since February 1997
and Senior Vice President since January 1999. Mr. Galluccio had served as
president of ION during 1998 and, prior to that, as a senior vice president of
our company since December 1995. Prior to joining our company, from
January 1992 to October 1994, Mr. Galluccio was employed by British
Telecommunications plc, as a global sales manager for network outsourcing
operations. Prior to joining British Telecommunications plc, Mr. Galluccio spent
25 years with International Business Machines Corporation in various sales,
marketing and business development positions and was involved in both domestic
and world trade assignments.

    GERARD BENEDETTO has been Senior Vice President--Chief Financial Officer
since February 1998. From July 1995 to January 1998, he was vice
president--chief accounting officer at Metromedia International
Telecommunications, Inc. From October 1993 to July 1995, he was vice
president--chief financial officer at Metromedia Restaurant Group. From
February 1985 to October 1993, he was vice president--chief financial officer at
Metromedia Communications Corporation.

    NICHOLAS M. TANZI has been Senior Vice President--Sales and Marketing since
August 1997. From March 1995 to July 1997, he served as vice
president--enterprise networks division at Fujitsu Business Communications
Systems. From April 1993 to February 1995, Mr. Tanzi was director of sales,
Eastern

                                      S-61
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Region at Asante Technologies Inc. Mr. Tanzi was employed in various capacities
from November 1979 through October 1993 at Digital Equipment Corporation.

    SILVIA KESSEL has served as a Director of our company since July 1997 and as
Executive Vice President since October 1997. Ms. Kessel has served as chief
financial officer and treasurer of Metromedia International Group, Inc. since
1995 and executive vice president of Metromedia International Group, Inc. since
1996. In addition, Ms. Kessel served as executive vice president of Orion
Pictures Corporation, a motion picture production and distribution company, from
January 1993 through July 1997, senior vice president of Metromedia Company
since 1994 and president of Kluge & Company since January 1994. Prior to that
time, Ms. Kessel served as senior vice president and a director of Orion
Pictures Corporation from June 1991 to November 1992 and managing director of
Kluge & Company from April 1990 to January 1994. Ms. Kessel is executive vice
president and a member of the Board of Directors of Big City Radio, Inc. and of
Metromedia International Group, Inc. In addition, Ms. Kessel is a director of
Liquid Audio, Inc.

    JOHN W. KLUGE has been a Director of our company since July 1997. Mr. Kluge
has been the president and chairman of Metromedia Company and its
predecessor-in-interest, Metromedia, Inc., for over five years. Mr. Kluge has
been the chairman of the Board of Metromedia International Group, Inc. since
1995. In addition, Mr. Kluge has been chairman of the Board of Directors and a
director of Orion Pictures Corporation from 1992 until July 1997. He also serves
as a director of Conair Corporation and Occidental Petroleum Corporation.

    DAVID RAND has served as a Director of our company since September 1999. Mr.
Rand has served as AboveNet's Chief Technology Officer since March 1996,
initially as a consultant, and since May 1998 as an employee. Mr. Rand has
served as a member of the Internet Engineering Task Force for the past seven
years. Mr. Rand authored rfc 1962 and rfc 1663, developed the EtherValve
technology, ASAP and APS, as well as co-developed MRTG. From September 1995 to
May 1998, Mr. Rand was an engineer at Cisco Systems, Inc., a router
manufacturer. From February 1994 to August 1995, Mr. Rand was an engineer at
Innovative Systems and Technologies, a video compression company. From
October 1993 to February 1994, Mr. Rand was a software engineer at
Novell, Inc., a network server company.

    DAVID ROCKEFELLER has served as a Director of our company since
October 1997. Mr. Rockefeller currently serves as a member of The Chase
Manhattan Bank's International Advisory Committee, as chairman of Rockefeller
Center Properties, Inc. (since 1995) and as a director of Rockefeller & Co.,
Inc. (since 1994), a privately owned investment management firm, and its parent
corporation, Rockefeller Financial Services Inc. From 1961 to 1981, Mr.
Rockefeller served as chairman of The Chase Manhattan Corporation and The Chase
Manhattan Bank, N.A. From 1981 to 1995, he served as chairman of Rockefeller
Group, Inc.

    STUART SUBOTNICK has served as a Director of our Company since July 1997.
Mr. Subotnick has been the vice chairman of the Board of Directors of Metromedia
International Group, Inc. since 1995 and president and chief executive officer
of Metromedia International Group, Inc. since December 1996. In addition,
Mr. Subotnick served as vice chairman of the Board of Directors of Orion
Pictures Corporation from 1992 until July 1997. Mr. Subotnick has served as
executive vice president of Metromedia Company and its predecessor-in-interest,
Metromedia, Inc., for over five years. Mr. Subotnick has served as vice chairman
of Metromedia International Group, Inc. since November 1995 and president and
chief executive officer of Metromedia International Group, Inc. since November
1996. Mr. Subotnick is also a director of Carnival Cruise Lines, Inc. and
chairman of the Board of Directors of Big City Radio, Inc.

    SHERMAN TUAN, the founder of AboveNet, has served as a Director of our
company since September 1999. Mr. Tuan has served as Chief Executive Officer and
a Director of AboveNet since 1996, and President until January 1998. Mr. Tuan
served as chairman of the board of AboveNet from August 1998 to September 1999.
Mr. Tuan was president of InterNex Information Services, Inc., an Internet
infrastructure provider, from November 1994 to October 1995 and from
February 1994 to November 1995, was president

                                      S-62
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of Tiara Computer, Inc., a network equipment manufacturer, which merged with
InterNex Information Services, Inc. in November 1994. From January 1992 to
June 1993, Mr. Tuan was vice president of worldwide sales and marketing of
Primus Technologies, Inc., a provider of problem resolution and knowledge
management software, and president of Celerite Graphics, Inc., a manufacturer of
video chips. Mr. Tuan received an electrical engineering degree from Feng-Chia
University in Taiwan.

    ARNOLD L. WADLER has served as our Executive Vice President, General Counsel
and Secretary since October 1997 and has served as a Director of our company
since July 1997. Mr. Wadler has served as executive vice president, general
counsel and secretary of Metromedia International Group, Inc. since August 29,
1996 and, from November 1, 1995 until that date, as senior vice president,
general counsel and secretary of Metromedia International Group, Inc. and as the
executive vice president, general counsel, secretary and director of Big City
Radio, Inc. since December 1997. In addition, Mr. Wadler serves as a director of
Metromedia International Group, Inc. and has served as a director of Orion
Pictures Corporation from 1991 until July 1997 and as senior vice president,
secretary and general counsel of Metromedia Company, and its
predecessor-in-interest, Metromedia, Inc., for over five years.

    LEONARD WHITE has served as a Director of our company since October 1997.
Mr. White has served as president and chief executive officer of Rigel
Enterprises since July 1997. Mr. White served as president and chief executive
officer of Orion Pictures Corporation from 1992 until 1997 and as president and
chief executive officer of Orion Home Entertainment Corporation from 1987 to
1992. Mr. White also serves as a director of Metromedia International Group,
Inc., Big City Radio, Inc. and American Film Technologies, Inc.

BOARD OF DIRECTORS

    There are presently eleven members on the Board of Directors of our company.
Holders of the class B common stock are entitled to elect 75% of the Board of
Directors and holders of the class A common stock are entitled to vote as a
separate class to elect the remaining directors. Currently, eight of the eleven
directors are nominees of the holders of class B common stock and as a result
holders of the class A common stock are entitled to fill three vacancies on the
Board of Directors. Members of each class of directors will hold office until
their successors are elected and qualified. The directors are elected by a
plurality vote of all votes cast at each annual meeting of the stockholders
entitled to vote for such directors and hold office for a one-year term.

COMPENSATION OF DIRECTORS

    During 1999, each director of our company who was not an officer, employee
or affiliate of our company (the "Non-Employee Directors") will be entitled to
receive a $20,000 annual retainer plus a separate attendance fee of $1,200 for
each meeting of the Board of Directors attended by a Non-Employee Director in
person or $500 for each meeting of the Board of Directors in which a
Non-Employee Director participated by conference telephone call. Members of
committees of the Board of Directors are paid $500 for each meeting attended. In
addition, our 1998 Incentive Stock Plan entitles any Non-Employee Director who
meets the criteria for "outside director" under Section 162(m) of the Internal
Revenue Code and who first serves on the Board of Directors subsequent to the
adoption of the 1998 Incentive Stock Plan to receive awards under such plan of
40,000 shares of class A common stock, each having an exercise price equal to
the fair market value of a share of class A common stock on the date of grant.
Awards to Non-Employee Directors under the 1998 Incentive Stock Plan will be
aggregated with awards under the 1997 Incentive Stock Plan so that total awards
under each plan will not exceed 40,000 shares of class A common stock.

    Non-Employee Directors are entitled to receive options to purchase 40,000
shares of our class A common stock under our 1997 Incentive Stock Plan. Options
to purchase 40,000 shares of class A common stock will be granted annually on
the day of each annual stockholder meeting. Each outside director is eligible to
receive options to purchase a maximum of 100,000 shares of class A common stock
under the plan. Under the 1997 Incentive Stock Plan, each Non-Employee Director
who was a director of our

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company on October 28, 1997 was granted an option to purchase 40,000 shares of
our common stock at an exercise price of $2.00, the price of the class A common
stock on the date of the Initial Public Offering.

    In addition, on August 20, 1997, we granted to each of Mr. Kluge and
Mr. Subotnick options to purchase 2,028,000 shares of class A common stock at an
exercise price of $.245 per share, and to each of Mr. Wadler and Ms. Kessel
options to purchase 405,600 shares of class A common stock at an exercise price
of $.245 per share, in each case.

EXECUTIVE COMPENSATION

    The following table provides you with information on the compensation
awarded to, earned by or paid to the Chief Executive Officer and the four other
most highly compensated executive officers of our company whose individual
compensation exceeded $100,000 during the fiscal years ended December 31, 1998,
1997 and 1996 for services rendered in all capacities to us and our
subsidiaries. The persons listed in the table below are referred to as the
"Named Executive Officers."

<TABLE>
<CAPTION>
                                                                                                  LONG TERM
                                                          ANNUAL COMPENSATION                COMPENSATION AWARDS
                                                  ------------------------------------   ---------------------------
                                                                             OTHER          NUMBER OF         ALL
                                                                             ANNUAL         SECURITIES       OTHER
                                                                          COMPENSATION   UNDERLYING STOCK   COMPENS.
NAME AND PRINCIPAL POSITION              YEAR     SALARY($)   BONUS ($)      ($)(1)        OPTIONS (2)        ($)
- ---------------------------            --------   ---------   ---------   ------------   ----------------   --------
<S>                                    <C>        <C>         <C>         <C>            <C>                <C>
Stephen A. Garofalo..................    1998      328,385    100,000      23,301              --           -- -- --
  Chairman and Chief Executive           1997      295,000     50,000      14,157         3,042,000(3)
  Officer                                1996      225,960       --          --

Howard M. Finkelstein................    1998     321,462     100,000      24,074              --           -- -- --
  President and Chief Operating          1997     196,756      50,000      11,769        12,168,000(5)
  Officer(4)                             1996        --          --          --

Vincent A. Galluccio.................    1998      183,400     15,000       1,673            300,000(6)      -- --
  Senior Vice President                  1997      181,522       --          --            2,481,840(7)        --
                                         1996      127,087       --          --

Gerard Benedetto.....................    1998     181,423        --         3,355         1,100,000(9)      -- -- --
  Senior Vice President--Chief           1997        --          --          --                --
  Financial Officer(8)                   1996        --          --          --

Nicholas M. Tanzi....................    1998     158,000      65,000       2,819          300,000(6)        -- --
  Senior Vice President--Sales and       1997        --          --          --           721,680(11)
  Marketing(10)                          1996        --          --          --                --
</TABLE>

- ------------------------

(1) Includes amounts paid as automobile allowance, insurance premiums and 401(k)
    matching funds.

(2) This information gives effect to our stock splits.

(3) Includes presently exercisable options to purchase 3,043,000 shares of
    class A common stock at an exercise price of $.245 per share.

(4) Since Mr. Finkelstein was hired by us during 1997, the preceding year's
    compensation is not applicable.

(5) Includes presently exercisable options to purchase 12,168,000 shares of
    class A common stock at an exercise price of $.245 per share.

(6) Includes options to purchase 300,000 shares of class A common stock at an
    exercise price of $5.25 per share that will become exercisable ratably over
    a four year period commencing August 31, 1999.

                                      S-64
<PAGE>
(7) Includes presently exercisable options to purchase 1,281,840 shares of
    class A common stock at an exercise price of $.245 per share, and options to
    purchase 300,000 shares of class A common stock, which Mr. Galluccio
    exercised during 1998. Also includes options to purchase 600,000 shares of
    class A common stock at an exercise price of $2.00 per share that will
    become exercisable ratably over a four year period commencing October 28,
    1998.

(8) Since Mr. Benedetto was hired by us during 1998, the preceding year's
    compensation is not applicable.

(9) Includes options to purchase 800,000 and 300,000 shares of class A common
    stock at an exercise price of $1.94 and $5.25 per share that will become
    exercisable ratably over a four year period commencing January 6, 1999 and
    August 31, 1999, respectively.

(10) Since Mr. Tanzi was hired by Metromedia Fiber Network during 1997, the
     preceding year's compensation is not applicable. Compensation information
     for 1997 is omitted because aggregate compensation during such fiscal year
     was less than $100,000.

(11) Includes presently exercisable options to purchase 121,680 shares of
     class A common stock at an exercise price of $.96 per share and options to
     purchase 600,000 shares of class A common stock at an exercise price of
     $2.00 per share that will become exercisable ratably over a four year
     period commencing October 28, 1998.

    During 1998 and 1997, Mr. Wadler and Ms. Kessel, each of whom serves as an
executive officer of our company, were employed and paid by Metromedia Company,
pursuant to a management agreement with Metromedia Company, dated as of
January 2, 1998, as amended (the "Management Agreement"). Please refer to the
section in this prospectus supplement entitled "Certain Relationships and
Related Transactions--Recent Transactions--Management Agreement." We did not pay
any other amounts to the Named Executive Officers during 1997 or 1998.

    During 1999, certain of our executive officers were granted stock options to
purchase 150,000 shares of class A common stock at an exercise price of $26.375
per share.

EMPLOYMENT AGREEMENTS

    We have entered into employment agreements with each of our Named Executive
Officers.

    GAROFALO EMPLOYMENT AGREEMENT.  Mr. Garofalo's employment agreement, dated
as of February 26, 1997, has a five year term. It provides Mr. Garofalo a base
salary of $295,000 for the first year, $335,000 for the second year, $375,000
for the third year, $415,000 for the fourth year and $455,000 for the fifth
year. Mr. Garofalo is also entitled to receive an annual incentive bonus to be
determined by the Compensation Committee of the Board of Directors. The
incentive bonus will not be less than $100,000 per year. Mr. Garofalo's
employment agreement also provides for other employee benefits such as a car
allowance, life insurance, health care and certain disability and death
benefits. In addition, Mr. Garofalo was granted options to purchase 3,042,000
shares of class A common stock at an exercise price of $.245 per share after
giving effect to the recent stock splits. These options are immediately
exercisable and expire 10 years from their grant. We registered the shares of
class A common stock underlying the options under the Securities Act upon the
consummation of the initial public offering.

    Except in the case of disability, we may terminate Mr. Garofalo's employment
only for cause, upon which termination Mr. Garofalo will have no right to
receive any compensation or benefit from us. If the agreement is terminated
without cause, or if Mr. Garofalo terminates employment for good reason, we will
be obligated to pay Mr. Garofalo an amount equal to the greater of (i) his
monthly base salary as then in effect multiplied by the number of months
remaining in term of his employment as of such termination date and (ii)
$1,000,000. "Good reason" includes:

    - a reduction in the nature or scope of Mr. Garofalo's titles, authorities,
      powers, duties or responsibilities;

                                      S-65
<PAGE>
    - a change in the method or formula for determining the bonus, which results
      in a decrease in the amount of bonus payable to Mr. Garofalo;

    - the removal of Mr. Garofalo as a member of the Board of Directors, unless
      such removal occurs after termination of Mr. Garofalo's employment for
      cause;

    - a sale of all or substantially all of the ownership interests or assets of
      our company, or a merger or consolidation of our company with any other
      corporation or entity;

    - a change in control of our company, defined as any person or entity, other
      than Mr. Garafalo, becoming a beneficial owner, as defined in Rule 13d-3
      of the Securities Exchange Act of 1934, directly or indirectly, of
      securities of our company representing 50% or more of the combined voting
      power of our then outstanding securities; or

    - a material breach by our company of our affirmative or negative covenants
      or undertakings in the employment agreement, and a failure to remedy such
      breach within 15 days.

    Pursuant to the agreement, Mr. Garofalo has agreed not to compete with us
for a period of one year following termination of the agreement. During such
non-compete period, Mr. Garofalo will be entitled to receive an amount equal to
his base salary as in effect on the date of termination, so long as the
agreement was not terminated prior to the expiration of the term by either
party.

    FINKELSTEIN EMPLOYMENT AGREEMENT.  Mr. Finkelstein's employment agreement,
dated as of April 30, 1997, has a three year term. It provides Mr. Finkelstein
with a base salary of $295,000 for the first year, $335,000 for the second year
and $375,000 for the third year. Mr. Finkelstein is also entitled to receive an
annual incentive bonus to be determined by the Compensation Committee of the
Board of Directors. The incentive bonus will not be less than $100,000 for each
year. Mr. Finkelstein's employment agreement also provides for other employee
benefits such as a car allowance, life insurance, health care, and certain
disability and death benefits. In addition, Mr. Finkelstein was granted options
to purchase 12,168,000 shares of class A common stock at an exercise price of
$.245 per share after giving effect to the recent stock splits, which options
are immediately exercisable and expire 10 years from their grant. We registered
these shares of class A common stock under the Securities Act upon the
consummation of our initial public offering.

    Except in the case of disability, we may terminate Mr. Finkelstein's
employment only for cause, upon which termination Mr. Finkelstein will have no
right to receive any compensation or benefit from us. If the agreement is
terminated without cause, or if Mr. Finkelstein terminates employment for good
reason, we will be obligated to pay to Mr. Finkelstein his base salary, bonus
and benefits that are accrued and unpaid as of the date of termination, as well
as an amount equal to one and a half time his base salary as then in effect.
"Good reason" includes

    - a reduction in the nature or scope of Mr. Finkelstein's titles,
      authorities, powers, duties or responsibilities;

    - a change in the method or formula for determining the bonus, which results
      in a decrease in the amount of bonus payable to Mr. Finkelstein;

    - the removal of Mr. Finkelstein as a member of the Board of Directors,
      unless such removal occurs after termination of Mr. Finkelstein's
      employment for cause;

    - a sale of all or substantially all of the ownership interests or assets of
      our company, or a merger or consolidation of our company with any other
      corporation or entity;

    - a change in control of our company, defined as any person or entity, other
      than Mr. Garofalo, becoming a beneficial owner, as defined in Rule 13d-3
      of the Securities Exchange Act of 1934, directly or indirectly, of
      securities of our company representing 50% or more of the combined voting
      power of our then outstanding securities; or

                                      S-66
<PAGE>
    - a material breach by us of our affirmative or negative covenants or
      undertakings in the employment agreement, and a failure to remedy such
      breach within 15 days.

    Pursuant to the agreement, Mr. Finkelstein has agreed not to compete with us
for a period of one year following termination of the agreement. During such
non-compete period, Mr. Finkelstein will be entitled to receive an amount equal
to his base salary as in effect on the date of termination, so long as the
agreement was not terminated prior to the expiration of the term by either
party.

    GALLUCCIO EMPLOYMENT AGREEMENT.  Mr. Galluccio's employment agreement, dated
as of August 31, 1998, has a one year term and contains a one-year renewal
option which was exercised by the Company. It provides Mr. Galluccio with an
annual base salary of $225,000 for the current year. Mr. Galluccio is also
entitled to receive an annual incentive bonus, which is dependent upon our
performance, to be determined by the Compensation Committee of the Board of
Directors. If approved by the Compensation Committee, the incentive bonus has an
initial target of 20% of Mr. Galluccio's base salary. Mr. Galluccio's employment
agreement also provides for other employee benefits such as the right to
participate in all group health and insurance programs. In addition,
Mr. Galluccio was granted options to purchase 300,000 shares of class A common
stock at an exercise price of $5.25 per share. These shares have been registered
under the Securities Act on Form S-8.

    Except in the case of disability or a change of control, we may terminate
Mr. Galluccio's employment only for cause, upon which termination Mr. Galluccio
will have no right to receive any compensation or benefit from us. If
Mr. Galluccio's employment is terminated for any reason other than for cause, or
in the event that there is a change of control of our company and Mr. Galluccio
is requested, in connection with such change of control, to perform his duties
under this agreement on a regular, full-time basis at a location further than 75
miles from Mr. Galluccio's current principal office location, Mr. Galluccio, in
his sole and absolute discretion, may deem this agreement to be terminated by us
without cause. Upon such termination, Mr. Galluccio will be entitled to receive
his base salary for the remaining term of his employment agreement, all
previously earned and accrued entitlements and benefits from us and our employee
benefit plans, and an amount equal to 25% of Mr. Galluccio's base salary.

    Mr. Galluccio has agreed not to compete with us or any affiliated company
for a period of two years following the termination of his employment agreement.

    BENEDETTO EMPLOYMENT AGREEMENT.  Mr. Benedetto's employment agreement, dated
as of August 31, 1998, has a three and one-half year term. It provides
Mr. Benedetto with an annual base salary of $225,000 for the current year.
Mr. Benedetto is also entitled to receive an annual incentive bonus, which is
dependent upon our performance, to be determined by the Compensation Committee
of the Board of Directors. If approved by the Compensation Committee, the
incentive bonus has an initial target of 20% of Mr. Benedetto's base salary.
Mr. Benedetto's employment agreement also provides for other employee benefits
such as the right to participate in all group health and insurance programs. In
addition, Mr. Benedetto was granted options to purchase 300,000 shares of
class A common stock at an exercise price of $5.25 per share. These shares have
been registered under the Securities Act on Form S-8.

    Except in the case of disability or a change of control, we may terminate
Mr. Benedetto's employment only for cause, upon which termination Mr. Benedetto
will have no right to receive any compensation or benefit from us. If
Mr. Benedetto's employment is terminated for any reason other than for cause, or
in the event that there is a change of control of our company and Mr. Benedetto
is requested, in connection with such change of control, to perform his duties
under this agreement on a regular, full-time basis at a location further than 75
miles from Mr. Benedetto's current principal office location, Mr. Benedetto, in
his sole and absolute discretion, may deem this agreement to be terminated by us
without cause. Upon such termination, Mr. Benedetto will be entitled to receive
his base salary for the remaining term of his employment agreement, all
previously earned and accrued entitlements and benefits from us and our employee
benefit plans, and an amount equal to 25% of Mr. Benedetto's base salary.

                                      S-67
<PAGE>
    Mr. Benedetto has agreed not to compete with us or any affiliated company
for a period of two years following termination of his employment agreement.

    TANZI EMPLOYMENT AGREEMENT.  Mr. Tanzi's employment agreement, dated as of
August 31, 1998, has a two year term. It provides Mr. Tanzi with an annual base
salary of $225,000 for the current year. Mr. Tanzi is also entitled to receive
an annual incentive bonus, which is dependent upon our performance, to be
determined by the Compensation Committee of the Board of Directors. If approved
by the Compensation Committee, the incentive bonus has an initial target of 40%
of Mr. Tanzi's base salary. Mr. Tanzi's employment agreement also provides for
other employee benefits such as the right to participate in all group health and
insurance programs. In addition, Mr. Tanzi was granted options to purchase
300,000 shares of class A common stock at an exercise price of $5.25 per share.
These shares have been registered under the Securities Act on Form S-8.

    Except in the case of disability or change of control, we may terminate
Mr. Tanzi's employment only for cause, upon which termination Mr. Tanzi will
have no right to receive any compensation or benefit from us. If Mr. Tanzi's
employment is terminated for any reason other than for cause, or in the event
that there is a change of control of our company and Mr. Tanzi is requested, in
connection with such change of control, to perform his duties under this
agreement on a regular, full-time basis at a location further than 75 miles from
Mr. Tanzi's current principal office location, Mr. Tanzi, in his sole and
absolute discretion, may deem this agreement to be terminated by us without
cause. Upon such termination, Mr. Tanzi will be entitled to receive his base
salary for the remaining term of his employment agreement, all previously earned
and accrued entitlements and benefits from us and our employee benefit plans,
and an amount equal to 25% of Mr. Tanzi's base salary.

    Mr. Tanzi has agreed not to compete with us or any affiliated company for a
period of two years following termination of his employment agreement.

1997 AND 1998 INCENTIVE STOCK PLANS

    We have adopted the 1997 Incentive Stock Plan and the 1998 Incentive Stock
Plan pursuant to which key employees, officers and directors (including
independent directors and members of the Compensation Committee) of our company
and its subsidiaries who have substantial responsibility in the direction of our
company and its subsidiaries, and others whom the option committee determines
provide substantial and important services to our company, may be granted
(i) incentive stock options ("ISOs") and/or (ii) non-qualified stock options
("NQSOs" and, together with ISOs, "Stock Options"). The aggregate number of
shares of the class A common stock that may be the subject of Stock Options
under the Incentive Stock Plans is 28,000,000 (8,000,000 under the 1997
Incentive Stock Plan and 20,000,000 under the 1998 Incentive Stock Plan), and
the maximum number of shares of class A common stock available with respect to
Stock Options granted to any one grantee is 2,000,000 (800,000 under the 1997
Incentive Stock Plan and 1,200,000 under the 1998 Incentive Stock Plan) shares.

    The exercise price of all ISOs is the fair market value of the class A
common stock on the date of grant (or 110% of such fair market value with
respect to ISOs granted to persons who own stock possessing more than 10% of the
voting rights of our company's capital stock), and the exercise price of all
NQSOs is determined by the Compensation Committee, although the initial awards
will be made at fair market value of the class A common stock on the date of
grant. Stock Options vest and become exercisable over a period of years, as
determined by the Compensation Committee, and have a term not to exceed ten
years.

    If a grantee's employment with us is terminated because of the grantee's
death, or the grantee's retirement on or after attaining the age which the
company may from time to time establish as the retirement age for any class of
its employees, or the age specified in the employment agreement with such
grantee, prior to the date when the Stock Option is by its terms exercisable,
the Stock Option will be immediately exercisable as of the date of the
termination of the grantee's employment, subject to the other terms of the
Incentive Stock Plans. Upon a "change in control" of our company (as defined in
the

                                      S-68
<PAGE>
Incentive Stock Plans), each holder of a Stock Option will have the right to
exercise the Stock Option in full without regard to any waiting period,
installment period or other limitation or restriction thereon, and the right,
exercisable by written notice within 60 days after the change in control, to
receive in exchange for the surrender of an option an amount of cash equal to
the difference between the fair market value of the class A common stock on the
date of exercise and the exercise price of the Stock Option. For options granted
under the 1998 Incentive Stock Plan on or after November 13, 1998, in the event
of a change in control, the Board of Directors may in its sole discretion
determine (i) that each holder of such a Stock Option will have the right to
exercise the Stock Option in full without regard to any waiting period,
installment period or other limitation or restriction thereon, and/or (ii) each
holder of such a Stock Option will have the right, exercisable by written notice
within 60 days after the change of control, to receive, in exchange for the
surrender of a Stock Option, an amount of cash equal to the difference between
the fair market value of the class A common stock on the date of exercise and
the exercise price of the Stock Option. Alternatively, the board of directors
may in its sole discretion determine to take neither action. Upon a grantee's
termination of employment from our company or a subsidiary on account of
disability, the grantee or the legal representative of the grantee will have the
right, for a period of one year following the date of such termination, to
exercise a Stock Option, to the extent such award is exercisable and to the
extent such Stock Option has not yet expired. In the event the grantee's
employment with us is terminated for any reason other than disability, death or
retirement, the grantee may exercise a Stock Option within three months after
his or her termination of employment.

INDEMNIFICATION AGREEMENTS

    We have entered into indemnification agreements with certain officers and
directors. The indemnification agreements provide for indemnification of such
directors and officers to the fullest extent authorized or permitted by law. The
indemnification agreements also provide that:

    - we will advance all expenses incurred by the director or officer in
      defending certain litigation,

    - we will appoint in certain circumstances an independent legal counsel to
      determine whether the director or officer is entitled to indemnification,
      and

    - we will continue to maintain a directors' and officers' liability
      insurance (which currently consists of $25.0 million of primary coverage).

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

    The Compensation Committee consists of Messrs. Rockefeller and White.
Neither member of the Compensation Committee served as an officer or employee of
our company or any of its subsidiaries during fiscal 1998. There were no
material transactions between us and any of the members of the Compensation
Committee during fiscal 1998.

                                      S-69
<PAGE>
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

    TRADEMARK LICENSE AGREEMENT.  We are a party to a ten year royalty free
license agreement with Metromedia Company, pursuant to which Metromedia Company
has granted us a nonexclusive, nontransferable and nonassignable right and
license, without the right to grant sublicenses and to use the trade name,
trademark and corporate name Metromedia in the United States and worldwide. The
license agreement with Metromedia Company can be terminated by Metromedia
Company upon one month's prior written notice in the event that:

    - Metromedia Company or its affiliates own less than 20% of the common
      stock;

    - a change in control of our company occurs; or

    - any of the stock or all or substantially all of the assets of any of our
      subsidiaries are sold or transferred, in which case, the license agreement
      with Metromedia Company will terminate with respect to such subsidiary.

    A change in control of our company for purpose of the trademark license
agreement is defined as:

    - a transaction in which a person or group, within the meaning of
      Section 13(d)(3) of the Securities Exchange Act of 1934, not in existence
      at the time of the execution of the Metromedia license agreement becomes
      the beneficial owner of stock entitling such person or group to exercise
      50% or more of the combined voting power of all classes of our stock;

    - a change in the composition of our Board of Directors whereby a majority
      of the members are not directors serving on the Board of Directors at the
      time of the license agreement with Metromedia Company, or any person
      succeeding such director who was recommended or elected by such directors;

    - a reorganization, merger or consolidation where following consummation
      thereof, Metromedia Company would hold less than 20% of the combined
      voting power of all classes of our stock;

    - a sale or other disposition of all or substantially all of our assets; or

    - any transaction the result of which would be that the common stock would
      not be required to be registered under the Securities Exchange Act of
      1934, and the holders of common stock would not receive common stock of
      the survivor to the transaction which is required to be registered under
      the Securities Exchange Act of 1934.

    In addition, Metromedia Company has reserved the right to terminate this
trademark license agreement in its entirety immediately upon written notice to
us if, in Metromedia Company's sole judgment, our continued use of Metromedia as
a trade name would jeopardize or be detrimental to the good will and reputation
of Metromedia Company.

    We have agreed to indemnify Metromedia Company and hold it harmless against
any and all losses, claims, suits, actions, proceedings, investigations,
judgments, deficiencies, damages, settlements, liabilities and reasonable legal
expenses, and other related expenses, arising in connection with the license
agreement with Metromedia Company.

    As long as the Notes are listed on the Luxembourg Stock Exchange, the
Company will maintain a copy of the license agreement at the specified office of
the paying agent in Luxembourg.

    MANAGEMENT AGREEMENT.  We are a party to the management agreement under
which Metromedia Company provides us with consultation and advisory services
relating to legal matters, insurance, personnel and other corporate policies,
cash management, internal audit and finance, taxes, benefit plans and other
services as we may reasonably request. The management agreement terminates on
December 31 of each year, and is automatically renewed for successive one year
terms unless either party terminates upon

                                      S-70
<PAGE>
60 days prior written notice. We are also obligated to reimburse Metromedia
Company all its out-of-pocket costs and expenses incurred and advances paid by
Metromedia Company in connection with the management agreement. In this
agreement, we have agreed to indemnify Metromedia Company and hold it harmless
from and against any and all damages, liabilities, losses, claims, actions,
suits, proceedings, fees, costs or expenses, including reasonable attorneys'
fees and other costs and expenses incident to any suit, proceeding or
investigation of any kind imposed on, incurred by or asserted against Metromedia
Company in connection with the management agreement. In 1997, Metromedia Company
received no money for its out-of-pocket costs and expenses or for interest on
advances extended by it to us under the management agreement. For the year ended
December 31, 1998, we incurred $500,000 to Metromedia Company under this
agreement. The management fee for 1999 under the agreement is $1,000,000,
payable quarterly at a rate of $250,000.

    As long as the Notes are listed on the Luxembourg Stock Exchange, the
Company will maintain copies of the management agreement at the specified office
of the paying agent in Luxembourg.

                                      S-71
<PAGE>
                               SECURITY OWNERSHIP

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

    The following table provides you with certain information, as of
September 30, 1999, regarding the beneficial ownership of our voting stock after
giving effect to the stock split by (i) each of our directors and director
nominees, (ii) each person whom we believe beneficially owns more than 5% of our
outstanding voting stock, (iii) each Named Executive Officer and (iv) all our
executive officers and directors as a group. In accordance with the
rules promulgated by the Securities and Exchange Commission, the ownership
includes shares currently owned as well as shares which the named person has the
right to acquire beneficial ownership of within 60 days, including through the
exercise of options, warrants or other rights, or through the conversion of a
security. Accordingly, more than one more person may be deemed to be a
beneficial owner of the same securities. Except as otherwise indicated, each
stockholder listed below has sole voting and investment power of the shares
beneficially owned by that person. Some of the stockholders listed below intend
to dispose of a portion of their shares in a concurrent offering. See "Recent
and Proposed Transactions."

<TABLE>
<CAPTION>
                                            CLASS A                    CLASS B
                                         COMMON STOCK              COMMON STOCK(1)
                                   -------------------------   ------------------------
                                     NUMBER         PERCENT      NUMBER        PERCENT        PERCENT OF
                                   OF SHARES        OF CLASS   OF SHARES       OF CLASS   TOTAL VOTING POWER
                                   ----------       --------   ----------      --------   ------------------
<S>                                <C>              <C>        <C>             <C>        <C>
Stephen A. Garofalo..............  45,495,512(2)      22.5%        --            --               8.4%
Metromedia Company(3)............      --             --       31,462,048        93.2%           58.6%
Putnam Investments, Inc..........  29,056,060(4)      14.6%        --            --               5.4%
FMR Corp.........................  13,344,000(5)       6.7%        --            --               2.4%
Howard M. Finkelstein............  12,218,000(6)       5.8%        --            --               2.2%
Vincent A. Galluccio.............   1,524,015(7)      *   %        --            --            *
Gerard Benedetto.................     475,000(8)      *            --            --            *
Nicholas M. Tanzi................     366,880(9)      *            --            --            *
Silvia Kessel....................     510,472(10)     *            --            --            *
John W. Kluge....................   2,028,000(11)        1%    31,462,048(12)    93.2%           59.0%
David Rockefeller................   2,829,104(13)      1.4%        --            --            *
Stuart Subotnick.................   2,028,000(11)        1%    33,769,272(12)   100.0%           62.9%
Arnold L. Wadler.................     615,344(10)     *            --            --            *
Leonard White....................      46,000(14)     *            --            --            *
Sherman Tuan.....................   1,074,889(15)     *            --            --            *
David Rand.......................     455,175(16)     *            --            --            *
All Directors and Executive
  Officers as a Group............  69,626,391(17)     31.5%    33,769,272       100.0%           75.9%
</TABLE>

- ------------------------

*   less than 1.0%

(1) The shares of class B common stock are convertible into shares of class A
    common stock at the rate of one share of class A common stock for each share
    of class B common stock, and the holders of shares of class B common stock
    are entitled to 10 votes per share.

(2) Includes presently exercisable options to purchase 3,042,000 shares of
    class A common stock at an exercise price of $.245 per share of which
    2,882,000 are held by the Stephen A. Garofalo 1999 Annuity Trust No. 1 and
    160,000 are held by the Stephen A. Garofalo 1999 Annuity Trust No. 2.
    Mr. Garofalo is the trustee of both trusts. Mr. Garofalo's address is One
    North Lexington Avenue, White Plains, New York, New York 10601.

(3) Metromedia Company's address is One Meadowlands Plaza, East Rutherford, NJ
    07073.

(4) Based solely upon the Schedule 13G, dated February 2, 1999 filed by Putnam
    Investments, Inc. Putnam Investments, Inc's address is One Post Office
    Square, Boston, Massachusetts, 02109.

                                      S-72
<PAGE>
(5) Based solely on the Schedule 13G, dated February 16, 1999 filed by FMR
    Corp., Edward C. Johnson III and Abigail P. Johnson. FMR's address is 82
    Devonshire Street, Boston, Massachusetts 02109.

(6) Includes presently exercisable options to purchase 12,168,000 shares of
    class A common stock at an exercise price of $.245 per share and 50,000
    shares of class A common stock owned by members of Mr. Finkelstein's family.
    Mr. Finkelstein's address is One North Lexington Avenue, White Plains, New
    York, New York 10601.

(7) Includes presently exercisable options to purchase 1,131,840 and 325,000
    shares of class A common stock at an exercise price of $.245 and $2.00 per
    share, respectively and 17,175 shares owned by his spouse.

(8) Includes presently exercisable options to purchase 350,000 and 75,000 shares
    of class A common stock at an exercise price of $1.9375 and $5.25 per share,
    respectively.

(9) Includes presently exercisable options to purchase 285,000, 75,000 and 880
    shares of class A common stock at an exercise price of $2.00, $5.25 and
    $.95375 per share, respectively. Also includes 5,200 shares of class A
    common stock owned by members of Mr. Tanzi's family, with respect to which
    Mr. Tanzi has been granted a proxy to vote. Mr. Tanzi's address is One North
    Lexington Avenue, White Plains, New York 10601.

(10) Includes 405,600 presently exercisable options to acquire shares of
    class A common stock at an exercise price of $.245 per share held by each of
    Ms. Kessel and Mr. Wadler. Does not include shares owned by Metromedia
    Company. Ms. Kessel and Mr. Wadler are employed by Metromedia Company and
    disclaim beneficial ownership of the shares owned by Metromedia Company.

(11) Consists of 2,028,000 presently exercisable options to acquire shares of
    class A common stock at an exercise price of $.245 per share held by each of
    Mr. Kluge and Mr. Subotnick. Mr. Kluge's address is 215 East 67th Street,
    New York, NY 10021 and Mr. Subotnick's address is 215 East 67th Street, New
    York, NY 10021.

(12) Includes 31,462,048 shares owned by Metromedia Company. Messrs. Kluge and
    Subotnick, directors of our company, are general partners of Metromedia
    Company.

(13) Represents 2,789,104 shares owned by DR & Descendants LLC, of which
    Mr. Rockefeller is Managing Member and for which he exercises voting and
    investment power plus presently exercisable options in his own name to
    purchase 40,000 shares of class A common stock at an exercise price of $2.00
    per share. Mr. Rockefeller disclaims actual beneficial ownership of shares
    owned by DR & Descendants LLC except as to one seventh ( 1/7) of the shares
    attributable to his proportionate interest in the LLC. The other interests
    of the LLC are owned by Mr. Rockefeller's six children.

(14) Includes 40,000 presently exercisable options to acquire shares of class A
    common stock at an exercise price of $2.00 per share.

(15) Includes presently exercisable options to purchase
    205,625, 146,875, 11,750, 284,025, 5,875 and 35,250 shares of class A common
    stock at an exercise price of $.018, $.171,, $.511, $4.25, $5.16 and
    $33.192, respectively.

(16) Includes presently exercisable options to purchase
     10,260, 58,750, 11,750, 237,937, 15,875, 58,750 and 35,250 shares of
     class A common stock at an exercise price of $.052, $.171, $.171, $.511,
     $4,256, $5.16, $22.208 and $33.192, respectively.

(17) Includes presently exercisable options to acquire 21,209,040, 880, 350,000,
    690,800, 150,000, 10,260, 205,625, 23,500, 521,962, 11,750, 58,750 and
    70,500 shares of class A common stock at an exercise price of $.245,
    $.95375, $1.9375, $2.00, $5.25, $.052, $.511, $4.256, $5.16, $22.208 and
    $33.192, respectively.

                                      S-73
<PAGE>
                       DESCRIPTION OF OTHER INDEBTEDNESS

DESCRIPTION OF OUR 10% SENIOR NOTES DUE 2008

    GENERAL.  On November 25, 1998 we issued $650 million of 10% Senior Notes
due 2008 pursuant to an indenture between us and IBJ Schroeder Bank and Trust
Company (which has been succeeded by The Bank of New York), as trustee. On
May 26, 1999, we consummated an offer to exchange those notes for $650 million
of 10% Senior Notes due 2008 that had been registered under the Securities Act.

    PRINCIPAL, MATURITY AND INTEREST.  The 10% Senior Notes due 2008 are limited
in aggregate principal amount to $650 million and will mature on November 15,
2008. Interest on the 10% Senior Notes due 2008 accrues at 10% per annum and is
payable semiannually in arrears on May 15 and November 15 of each year.

    RANKING  The 10% Senior Notes due 2008 are our unsecured senior obligations,
that rank equally in right of payment with all of our existing and future senior
unsecured obligations and rank senior in right of payment to all of our future
subordinated obligations. The 10% Senior Notes due 2008, however, are
effectively subordinated to all of our existing and future secured indebtedness
to the extent of the assets that secure that indebtedness and to all of our
subsidiaries existing and future obligations, whether or not secured.

    REDEMPTION.  The 10% Senior Notes due 2008 are redeemable on or after
November 15, 2003, at our option, in whole or in part, at the following
redemption prices (expressed as percentages of principal amount) described below
plus accrued interest, if redeemed during the twelve-month period beginning on
November 15 of the years indicated below:

<TABLE>
<CAPTION>
YEAR                                                          PERCENTAGE
- ----                                                          ----------
<S>                                                           <C>
2003........................................................    105.000%
2004........................................................    103.333%
2005........................................................    101.667%
2006 and thereafter.........................................    100.000%
</TABLE>

    In addition, at any time on or before November 15, 2001, we may redeem up to
35% of the original aggregate principal amount of the 10% Senior Notes due 2008
with the net proceeds of a sale of common equity at a redemption price equal to
110% of the principal amount thereof, plus accrued interest, provided that at
least 65% of the original aggregate principal amount of 10% Senior Notes due
2008 remains outstanding after such redemption and provided further, that we use
the net cash proceeds of any public equity offering resulting in gross proceeds
of at least $100 million. Except in connection with a change of control or an
asset sale, as defined in the indenture relating to the 10% Senior Notes due
2008, of our company, we are not required to make mandatory redemption or
sinking fund payments with respect to the 10% Senior Notes due 2008.

    COVENANTS.  The indenture relating to the 10% Senior Notes due 2008
restricts, among other things, our ability to incur additional indebtedness, pay
dividends or make certain other restricted payments, incur certain liens, sell,
assign, transfer, lease, convey or otherwise dispose of substantially all of our
assets, enter into certain transactions with affiliates, or incur certain
indebtedness. The indenture relating to the 10% Senior Notes due 2008 permits,
under certain circumstances, our subsidiaries to be deemed unrestricted
subsidiaries and thus not subject to the restrictions of the indenture.

                                      S-74
<PAGE>
    EVENTS OF DEFAULT.  The indenture relating to the 10% Senior Notes due 2008
contains standard events of default, including:

    - defaults in the payment of principal, premium or interest;

    - defaults in the compliance with covenants contained in the indenture;

    - cross defaults on more than $15 million of other indebtedness;

    - failure to pay more than $15 million of judgements; and

    - certain events of our subsidiaries.

                        RECENT AND PROPOSED TRANSACTIONS

OFFERING OF DECS SECURITIES

    Concurrently with the offering described in this prospectus supplement, some
of our stockholders intend to enter into prepaid forward contracts with DECS
Trust VI, under which DECS Trust VI will agree to purchase from those
stockholders on November 15, 2002 (which date may be extended to February 15,
2003) an aggregate of up to 10,000,000 (excluding the over-allotment option)
shares of class A common stock beneficially owned by those stockholders subject
to the terms and conditions set forth in those contracts. Stockholders who enter
into these prepaid forward contracts will continue to beneficially own and vote
these shares until such future date. We understand that DECS Trust VI will
concurrently sell an aggregate of 10,000,000 (excluding the over-allotment
option) DECS securities. We will receive no portion of the proceeds from these
transactions.

SALE OF CLASS A COMMON STOCK BY THE SELLING STOCKHOLDERS

    Concurrently with the offering described in this prospectus supplement, some
of our stockholders intend to sell 4,895,000 (excluding the over-allotment
option) shares of class A common stock. Each share of class A common stock will
be sold at $39 7/16 per share resulting in $193,046,563 aggregate gross proceeds
to those stockholders. We will receive no portion of the proceeds from this
sale.

    Neither of the transactions described above nor the offering described in
this prospectus supplement is conditioned upon any of the other transactions.

PROPOSED INVESTMENT BY BELL ATLANTIC

    On October 7, 1999, Bell Atlantic entered into a securities purchase
agreement with us, under which Bell Atlantic has agreed to purchase
approximately 25.6 million newly issued shares of our class A common stock at a
price of $28.00 per share and a convertible subordinated note of approximately
$975.3 million, which note is convertible into shares of our class A common
stock at a conversion price of $34.00 per share. The closing of these
transactions under the securities purchase agreement is subject to:

    - the expiration of the waiting period under the Hart-Scott-Rodino Antitrust
      Improvements Act of 1976, as amended;

    - approvals from various regulatory authorities;

                                      S-75
<PAGE>
    - with respect to that portion of the issuance of the shares and the
      convertible subordinated note in the aggregate in excess of 19.9% of the
      number of shares of our common stock outstanding at the closing (assuming
      conversion of the note to be acquired by Bell Atlantic), the approval of
      our stockholders; and

    - other customary closing conditions.

    At the closing of the issuance and sale of the shares and the convertible
subordinated note, we will enter into an indenture with U.S. Bank Trust National
Association, as trustee, governing the terms of the convertible subordinated
note. In addition, we will enter into registration rights agreements giving Bell
Atlantic registration rights with respect to the shares and the convertible
subordinated note at the closing of the issuance and sale of the shares and the
convertible subordinated note.

    As a condition to closing, we have agreed to enter into a stockholders'
agreement with Bell Atlantic, together with Metromedia Company, Mr. John W.
Kluge and Mr. Stuart Subotnick. Under the stockholders agreement, except under
certain circumstances, Bell Atlantic will agree to a "standstill" provision
under which it will agree not to acquire more that 22% of our common stock and
will not participate in certain acquisition proposals, tender offers, proxy
solicitations or similar transactions with respect to us without the consent of
our board of directors for a period of ten years. The parties to the
stockholders agreement will also agree to a number of restrictions on their
respective abilities to sell the shares of our common stock which they own
during a period of two years following closing of the transactions contemplated
by the securities purchase agreement. In addition, the stockholders agreement
will provide for certain tag-along rights and rights of first refusal among the
parties. Metromedia Company and Messrs. Kluge and Subotnick will agree to vote
all of their shares of class B common stock (which constitute approximately 63%
of the voting power of our common stock) in favor of the issuance of the shares
and the convertible subordinated note in the aggregate in excess of 19.9% of the
number of shares of our common stock outstanding at the closing. Bell Atlantic
will also have the right to have an observer at meetings of our board of
directors, and after converting the convertible subordinated note into shares of
class A common stock, Bell Atlantic will have the right to appoint two directors
to our board of directors.

                                      S-76
<PAGE>
                            DESCRIPTION OF THE NOTES

    THIS DESCRIPTION OF THE TERMS OF THE 10% SENIOR NOTES DUE 2009 DENOMINATED
IN U.S. DOLLARS (THE "DOLLAR NOTES") AND THE 10% SENIOR NOTES DUE 2009
DENOMINATED IN EUROS (THE "EURO NOTES" AND, TOGETHER WITH THE DOLLAR NOTES, THE
"NOTES") SUPPLEMENTS AND, TO THE EXTENT INCONSISTENT, MODIFIES THE DESCRIPTION
OF THE GENERAL TERMS AND PROVISIONS OF THE DEBT SECURITIES SET FORTH IN THE
ACCOMPANYING PROSPECTUS, TO WHICH REFERENCE IS MADE.

    The following description of material terms of the Notes does not purport to
be complete and is qualified in its entirety by reference to the Indenture to be
dated November 17, 1999 (the "Indenture"), between Metromedia Fiber Network,
Inc. and The Bank of New York, as trustee (the "Trustee") and to those terms
made part of the Indenture by reference to the Trust Indenture Act of 1939, as
amended (the "Trust Indenture Act"). We have filed the proposed form of the
Indenture as Exhibit 4.3 to the Registration Statement, of which this prospectus
supplement and the accompanying prospectus form a part. References in this
"Description of the Notes" to the "Company" or the "Issuer" refer to Metromedia
Fiber Network, Inc. only and not its subsidiaries. Terms (whether or not
capitalized) used but not defined herein have the meanings given to them in the
Indenture.

GENERAL

    The Dollar Notes and the Euro Notes are each to be issued pursuant to the
Indenture. The terms of the Notes will include those stated in the Indenture and
those made part of the Indenture by reference to the Trust Indenture Act. The
Notes will be subject to all such terms, and Holders of Notes are referred to
the Indenture and the Trust Indenture Act for a statement thereof. The following
summary of the material provisions of the Indenture does not purport to be
complete and is qualified in its entirety by reference to the Indenture,
including the definitions therein of certain terms used below. The definitions
of certain terms used in the following summary are set forth below under
"--Certain Definitions." For purposes of this summary, the term "Company" refers
only to Metromedia Fiber Network, Inc. and not to any of its Subsidiaries.

    As of the Issue Date, all of the Subsidiaries will be Restricted
Subsidiaries. Under certain circumstances, the Company will be able to designate
existing or future Subsidiaries as Unrestricted Subsidiaries. Unrestricted
Subsidiaries will not be subject to many of the restrictive covenants contained
in the Indenture. Neither the Company's investment in ION nor its investment in
the joint venture constructing the German Network will be considered
Subsidiaries for purposes of the Indenture.

TERMS OF NOTES

    The Notes will be general obligations of the Company and will rank equal in
right of payment with all existing and future unsecured senior Indebtedness of
the Company. The Notes will rank senior in right of payment to all subordinated
Indebtedness of the Company that may be issued in the future, if any. The Notes
will not be secured by any assets and, therefore, will be effectively
subordinated to any existing and future secured Indebtedness of the Company and
its Subsidiaries, including the Credit Agreement, to the extent of the value of
the assets securing such Indebtedness.

    The Company conducts substantially all of its operations through its
Subsidiaries and, therefore, the Company is dependent on the cash flow of its
Subsidiaries to meet its obligations, including its obligations with respect to
the Notes. The Notes will be effectively subordinated to all Indebtedness and
other liabilities and commitments (including trade payables and lease
obligations) of the Company's Subsidiaries, including any Guarantees of such
Subsidiaries with respect to the Credit Agreement. Any right of the Company to
receive assets of any of its Subsidiaries upon the latter's liquidation or
reorganization (and the consequent right of the Holders of the Notes to
participate in those assets) will be effectively subordinated to the claims of
that Subsidiary's creditors, except to the extent that the Company is itself
recognized as a

                                      S-77
<PAGE>
creditor of such Subsidiary, in which case the claims of the Company would still
be subordinate to any security in the assets of such Subsidiary and any
indebtedness of such Subsidiary that is senior to that held by the Company. See
"Risk Factors Relating to the Notes."

PRINCIPAL, MATURITY AND INTEREST

    The Dollar Notes will be limited in aggregate principal amount to
$750 million and the Euro Notes will be limited in aggregate principal amount to
[EURO]250 million. The Notes will mature on December 15, 2009 at a price equal
to 100% of the principal amount. Interest on the Dollar Notes and the Euro Notes
will accrue at the rate of 10% and 10% per annum, respectively, and will be
payable semi-annually in arrears on June 15 and December 15, commencing
June 15, 2000, to Holders of record on the immediately preceding June 1 and
December 1 until payment in full of the principal of the Notes has been made or
duly made available for payment. Interest on the Notes will accrue from the most
recent date to which interest has been paid or, if no interest has been paid,
from the date of original issuance. Interest will be computed on the basis of a
360-day year comprised of twelve 30-day months. Interest on overdue principal
and (to the extent permitted by law) on overdue installments of interest will
accrue at a rate equal 1% per annum in excess of the rate borne by the Notes.
For additional information concerning payments on the Notes. See "--Book Entry,
Delivery and Form--Payment on the Notes."

    We have appointed The Bank of New York to serve as register and principal
paying agent for the Notes. Application has been made to list the Notes on the
Luxembourg Stock Exchange. As long as the Notes are listed on the Luxembourg
Stock Exchange and as long as the rules of this exchange require, we will also
maintain a paying agent and a transfer agent in Luxembourg. The Dollar Notes
will be issued in definitive, fully registered, global form, without coupons in
denominations of $1,000 and integral multiples thereof. The Euro Notes will be
issued in definitive, fully registered, global form, without coupons in
denominations of [EURO]1,000 and integral multiples thereof. Except as described
below under "Book Entry, Delivery and Form," owners of beneficial interests in
global notes will not be entitled to receive physical delivery of certificated
Notes. The Trustee initially will be Paying Agent and Registrar under the
Indenture, and the Company may act as Paying Agent or Registrar under the
Indenture. No service will be made for any registration of transfer or exchange
of the Senior Notes, but we may require payment to cover any transfer tax or
similar governmental charge.

    The Company may, to the extent it is required to do so by applicable law,
deduct or withhold income or other similar taxes imposed by the United States of
America from principal or interest payments hereunder.

OPTIONAL REDEMPTION

    Except as set forth below, the Notes will not be redeemable at the Company's
option prior to December 15, 2004. Thereafter, the Notes will be subject to
redemption at any time at the option of the Company, in whole or in part, upon
not less than 30 nor more than 60 days' notice, at the redemption prices
(expressed as percentages of principal amount) set forth below, plus accrued and
unpaid interest thereon to the applicable redemption date (subject to the right
of Holders of record on the relevant record date to receive interest due on the
relevant interest payment date), if redeemed during the twelve-month period
beginning on December 15 of the years indicated below:

<TABLE>
<CAPTION>
                                      PERCENTAGE        PERCENTAGE
YEAR                               FOR DOLLAR NOTES   FOR EURO NOTES
- ----                               ----------------   --------------
<S>                                <C>                <C>

2004.............................       105.000%         105.000%

2005.............................       103.333%         103.333%

2006.............................       101.667%         101.667%

2007 and thereafter..............       100.000%         100.000%
</TABLE>

                                      S-78
<PAGE>
    Notwithstanding the foregoing, at any time prior to December 15, 2002, the
Company may, on any one or more occasions, redeem up to 35% of the aggregate
principal amount of each of the Dollar Notes and the Euro Notes (determined
separately) originally issued pursuant to the Indenture at a redemption price of
110% of the principal amount of the Dollar Notes and 110% of the principal
amount of the Euro Notes, in each case plus accrued and unpaid interest thereon
to the redemption date (subject to the right of Holders of record on the
relevant record date to receive interest due on the relevant interest payment
date), with the Net Cash Proceeds received from any Public Equity Offering made
by the Company resulting in gross proceeds to the Company of at least
$100 million; PROVIDED that at least 65% of the aggregate principal amount of
the Dollar Notes and the Euro Notes (determined separately) originally issued
pursuant to the Indenture remain outstanding immediately after the occurrence of
any such redemption. The Company may make any such redemption upon not less than
30 nor more than 60 days' notice (but in no event more than 90 days after the
closing of the related Public Equity Offering).

SELECTION AND NOTICE

    If less than all of the Notes are to be redeemed at any time, selection of
Notes for redemption will be made by the Trustee in compliance with the
requirements of the principal national securities exchange, if any, on which the
Notes are then listed, or, if the Notes are not so then listed, on a pro rata
basis, by lot or by such method as the Company shall deem fair and appropriate;
PROVIDED that no Notes of $1,000 or [EURO]1,000, as the case may be, or less
shall be redeemed in part. Notices of redemption shall be mailed by first class
mail at least 30 but not more than 60 days prior to the redemption date to each
Holder of Notes to be redeemed at its registered address. As long as the Notes
are listed on the Luxembourg Stock Exchange, such notice will be published in an
authorized newspaper in Luxembourg. Notices of redemption may not be
conditional. If any Note is to be redeemed in part only, the notice of
redemption that relates to such Note shall state the portion of the principal
amount thereof to be redeemed. A new Note in principal amount equal to the
unredeemed portion thereof will be issued in the name of the Holder thereof upon
cancellation of the original Note. Notes called for redemption will become due
on the date fixed for redemption. On and after the redemption date, interest
will cease to accrue on Notes or portions thereof called for redemption unless
the Company defaults in the payment thereof.

MANDATORY REDEMPTION

    The Company will not be required to make mandatory redemption or sinking
fund payments with respect to the Notes.

REPURCHASE AT THE OPTION OF HOLDERS

    CHANGE OF CONTROL

    Upon the occurrence of a Change of Control, each Holder of Notes will have
the right to require the Company to purchase all or any part (equal to $1,000 or
[EURO]1,000, as the case may be, or an integral multiple thereof) of such
Holder's Notes pursuant to the offer described below (the "Change of Control
Offer") at a purchase price in cash equal to 101% of the aggregate principal
amount thereof (the "Change of Control Payment"), plus accrued and unpaid
interest (and Liquidated Damages, if any) thereon to the date of purchase
(subject to the right of Holders of record on the relevant record date to
receive interest due on the relevant interest payment date); provided, that, the
Company shall not be obligated to repurchase Notes pursuant to a Change of
Control Offer in the event that it has exercised its rights to redeem all of the
Notes pursuant to the Indenture. Within 30 days following any Change of Control,
the Company will mail a notice to each Holder describing the transaction or
transactions that constitute the Change of Control and offering to purchase
Notes on the date specified in such notice, which date shall be no earlier than
30 and no later than 60 days from the date such notice is mailed (the "Change of
Control Payment Date"), in accordance with the procedures required by the
Indenture and described in such notice. As long

                                      S-79
<PAGE>
as the Notes are listed on the Luxembourg Stock Exchange, such notice will be
published in an authorized newspaper in Luxembourg.

    The Company will comply with the requirements of Rule 14e-1 under the
Exchange Act and any other securities laws and regulations to the extent such
laws and regulations are applicable in connection with the purchase of Notes as
a result of a Change of Control. To the extent that the provisions of any
securities laws or regulations conflict with any of the provisions of this
covenant, the Company will comply with the applicable securities laws and
regulations and will be deemed not to have breached its obligations under this
covenant by virtue thereof.

    On the Change of Control Payment Date, the Company will, to the extent
lawful, (1) accept for payment all Notes or portions thereof properly tendered
pursuant to the Change of Control Offer, (2) deposit with the Paying Agent an
amount equal to the Change of Control Payment plus accrued and unpaid interest
thereon in respect of all Notes or portions thereof so tendered and (3) deliver
or cause to be delivered to the Trustee Notes so accepted together with an
Officers' Certificate stating the aggregate principal amount of Notes or
portions thereof being purchased by the Company. The Paying Agent will promptly
mail or deliver to each Holder of Notes so tendered the Change of Control
Payment plus accrued and unpaid interest thereon for such Notes, and the Trustee
will promptly authenticate and mail or deliver (or cause to be transferred by
book entry) to each Holder a new Note equal in principal amount to any
unpurchased portion of Notes surrendered, if any; PROVIDED that each such new
Note will be in a principal amount of $1,000 or [EURO]1,000, as the case may be
or an integral multiple thereof. The Company will publicly announce the results
of the Change of Control Offer on or as soon as practicable after the Change of
Control Payment Date.

    The Change of Control provisions described above will be applicable whether
or not any other provisions of the Indenture are applicable. Except as described
above with respect to a Change of Control, the Indenture will not contain
provisions that permit the Holders of the Notes to require that the Company
purchase or redeem the Notes in the event of a takeover, recapitalization or
similar transaction. The Company's ability to purchase Notes upon a Change of
Control may be limited by the Company's then existing financial resources. There
can be no assurance that sufficient funds will be available when necessary to
make any such required purchases. See "Risk Factors--Purchase of Notes Upon a
Change of Control." The Company shall not be required to make a Change of
Control Offer if a third party makes the Change of Control Offer in the manner,
at the times and otherwise in compliance with the requirements set forth in the
Indenture and purchases all Notes validly tendered and not withdrawn.

    ASSET SALES

    The Company will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, consummate any Asset Sale, unless (i) the Company
(or such Restricted Subsidiary, as the case may be) receives consideration at
the time of such Asset Sale at least equal to the fair market value (as
determined in good faith by the Board of Directors (including as to the value of
all noncash consideration) and set forth in an Officer's Certificate delivered
to the Trustee) of the assets or Equity Interests issued or sold or otherwise
disposed of and (ii) at least 75% of the consideration therefor is in the form
of cash and/or Cash Equivalents or Telecommunications Assets, and (iii) the Net
Cash Proceeds received by the Company (or such Restricted Subsidiary, as the
case may be) from such Asset Sale are applied within 360 days following the
receipt of such Net Cash Proceeds, to the extent the Company (or such Restricted
Subsidiary, as the case may be) elects, (a) to the permanent redemption or
repurchase of outstanding Indebtedness (other than Subordinated Indebtedness)
that is secured Indebtedness (including that in the case of a revolver or
similar arrangement that makes credit available, such commitment is so
permanently reduced by such amount) or Indebtedness of the Company or such
Restricted Subsidiary that ranks equally with the Notes but has a maturity date
that is prior to the maturity date of the Notes and/or (b) to reinvest such Net
Cash Proceeds (or any portion thereof) in Telecommunications Assets.
Notwithstanding anything herein to the contrary, with respect to the
reinvestment of Net Cash Proceeds, only proceeds from an Asset Sale of

                                      S-80
<PAGE>
assets, or Equity Interests, of a Foreign Subsidiary may be used to retire
Indebtedness of a Foreign Subsidiary or reinvest in assets or Equity Interests
of a Foreign Subsidiary. The balance of such Net Cash Proceeds, after the
application of such Net Cash Proceeds as described in the immediately preceding
clauses (a) and (b), shall constitute "Excess Proceeds."

    When the aggregate amount of Excess Proceeds equals or exceeds
$15.0 million (taking into account income earned on such Excess Proceeds), the
Company will be required to make a pro rata offer to all Holders of Notes and
PARI PASSU Indebtedness with comparable provisions requiring such Indebtedness
to be purchased with the proceeds of such Asset Sale (an "Asset Sale Offer") to
purchase the maximum principal amount or accreted value in the case of
Indebtedness issued with an original issue discount of Notes and PARI PASSU
Indebtedness that may be purchased out of the Excess Proceeds, at a purchase
price in cash in an amount equal to 100% of the principal amount thereof or the
accreted value thereof, as applicable, plus accrued and unpaid interest thereon
to the date of purchase (subject to the right of Holders of record on the
relevant record date to receive interest due on the relevant interest payment
date), in accordance with the procedures set forth in the Indenture and the
agreements governing such PARI PASSU Indebtedness. To the extent that any Excess
Proceeds remain after consummation of an Asset Sale Offer, the Company may use
such Excess Proceeds for any purpose not otherwise prohibited by the Indenture.
If the aggregate principal amount of Notes and PARI PASSU Indebtedness tendered
into such Asset Sale Offer surrendered by Holders thereof exceeds the amount of
Excess Proceeds, the Company shall select the Notes and PARI PASSU Indebtedness
to be purchased on a pro rata basis in proportion to the respective principal
amounts (or accreted values in the case of Indebtedness issued with an original
issue discount) of the Notes and such other Indebtedness. Upon completion, of
such Asset Sale Offer, the amount of Excess Proceeds shall be reset at zero for
purposes of the first sentence of this paragraph.

    The amount of (x) any liabilities (as shown on the Company's (or such
Restricted Subsidiary's, as the case may be), most recent balance sheet), other
than Subordinated Indebtedness, of the Company or any Restricted Subsidiary,
that are assumed by the transferee of any such assets pursuant to an agreement
that immediately releases the Company and all of its Restricted Subsidiaries
from all liability in respect thereof, (y) Indebtedness of any Restricted
Subsidiary that is no longer a Restricted Subsidiary as a result of such Asset
Sale, if the Company and all of its Restricted Subsidiaries immediately are
released from all Guarantees of payment of such Indebtedness and such
Indebtedness is no longer the liability of the Company or any of its Restricted
Subsidiaries, and (z) any securities, notes or other obligations received by the
Company (or such Restricted Subsidiary, as the case may be) from such transferee
that are contemporaneously (subject to ordinary settlement periods) converted by
the Company (or such Restricted Subsidiary, as the case may be) into cash and/or
Cash Equivalents (to the extent of the cash and/or Cash Equivalents received),
will be deemed to be cash and/or Cash Equivalents for purposes of this
provision.

CERTAIN COVENANTS

    RESTRICTED PAYMENTS

    The Company will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly: (i) declare or pay any dividend or make any other
payment or distribution on account of the Company's or any of its Restricted
Subsidiaries' Equity Interests or to the direct or indirect holders of the
Company's or any of its Restricted Subsidiaries' Equity Interests in their
capacity as stockholders (other than dividends or distributions payable in
Equity Interests (other than Disqualified Stock) of the Company or to the
Company or a Restricted Subsidiary of the Company); (ii) purchase, redeem or
otherwise acquire or retire for value any Equity Interests of the Company or any
of its Restricted Subsidiaries or any direct or indirect parent of the Company
(other than any such Equity Interests owned by the Company or any Consolidated
Subsidiary of the Company); (iii) make any payment on or with respect to, or
purchase, redeem, defease or otherwise acquire or retire for value any
Subordinated Indebtedness, except a payment of interest or

                                      S-81
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principal at Stated Maturity; or (iv) make any Restricted Investment (all such
payments and other actions set forth in clauses (i) through (iv) above being
collectively referred to as "Restricted Payments"), unless:

    (a) at the time of and after giving effect to such Restricted Payment, no
       Default or Event of Default shall have occurred and be continuing or
       would occur as a consequence thereof,

    (b) the Company would, at the time of such Restricted Payment and after
       giving pro forma effect thereto as if such Restricted Payment had been
       made at the beginning of the applicable period, have been permitted to
       incur at least $1.00 of additional Indebtedness pursuant to either
       clause (i) or (ii) of the first paragraph of the covenant described below
       under the caption "--Incurrence of Indebtedness and Issuance of Preferred
       Stock"; and

    (c) such Restricted Payment, together with the aggregate amount of all other
       Restricted Payments made by the Company and its Restricted Subsidiaries
       on and after the Issue Date (excluding Restricted Payments permitted by,
       and made pursuant to, clauses (ii), (iii) and (viii) of the next
       succeeding paragraph), is less than the sum, without duplication and
       except as credited in the next succeeding paragraph, of (i) 50% of the
       Consolidated Net Income of the Company for the period (taken as one
       accounting period) beginning on the last day of the fiscal quarter
       immediately preceding the Issue Date and ending on the last day of the
       fiscal quarter immediately preceding the date of such Restricted Payment
       (or, if such Consolidated Net Income for such period is a deficit, less
       100% of such deficit), plus (ii) 100% of the aggregate Net Cash Proceeds
       received by the Company on and after November 25, 1998 as a Capital
       Contribution or from the issue or sale of Equity Interests of the Company
       (other than Disqualified Stock) or from the issue or sale of Disqualified
       Stock or debt securities of the Company that have been converted or
       exchanged into such Equity Interests (other than Equity Interests (or
       Disqualified Stock or converted debt securities) sold to a Subsidiary of
       the Company), plus the amount of Net Cash Proceeds received by the
       Company upon such conversion or exchange, plus (iii) the aggregate amount
       equal to the net reduction in Investments in Unrestricted Subsidiaries on
       and after the Issue Date resulting from (x) dividends, distributions,
       interest payments, return of capital, repayments of Investments or other
       transfers of assets to the Company or any Restricted Subsidiary from any
       Unrestricted Subsidiary, (y) proceeds realized by the Company or any
       Restricted Subsidiary upon the sale of such Investment to a Person other
       than the Company or any Subsidiary of the Company, or (z) the
       redesignation of any Unrestricted Subsidiary as a Restricted Subsidiary,
       not to exceed in the case of any of the immediately preceding clauses
       (x), (y) or (z) the aggregate amount of Restricted Investments made by
       the Company or any Restricted Subsidiary in such Unrestricted Subsidiary
       on and after the Issue Date, plus (iv) to the extent that any Restricted
       Investment that was made on and after the Issue Date is sold for cash or
       otherwise liquidated or repaid for cash, the lesser of, to the extent
       paid to the Company or a Restricted Subsidiary, (A) the cash return of
       capital with respect to such Restricted Investment (less the cost of
       disposition, if any) and (B) the initial amount of such Restricted
       Investment.

    The foregoing provisions will not prohibit (i) the payment of any dividend
within 60 days after the date of declaration thereof, if at said date of
declaration such payment would have complied with the foregoing provisions;
(ii) the redemption, repurchase, retirement, defeasance or other acquisition of
any Subordinated Indebtedness or Equity Interests of the Company in exchange
for, or out of the Net Cash Proceeds of the substantially concurrent sale (other
than to a Subsidiary of the Company) of, Equity Interests of the Company (other
than any Disqualified Stock); PROVIDED that the amount of any such Net Cash
Proceeds that are utilized for, and the Equity Interests issued or exchanged
for, any such redemption, repurchase, retirement, defeasance or other
acquisition shall be excluded from clause (c) of the preceding paragraph and
each other clause of this paragraph; (iii) the defeasance, redemption,
retirement, repurchase or other acquisition of Subordinated Indebtedness with
the Net Cash Proceeds from, or issued in exchange for, a substantially
concurrent incurrence of Permitted Refinancing Indebtedness; PROVIDED that the
amount of any such Net Cash Proceeds that are utilized for any such redemption,
repurchase,

                                      S-82
<PAGE>
retirement, defeasance or other acquisition shall be excluded from
clause (c) of the preceding paragraph and each other clause of this paragraph;
(iv) the payment of any dividend or other distribution by a Restricted
Subsidiary of the Company to the holders of its Equity Interests on a pro rata
basis; (v) the repurchase, redemption or other acquisition or retirement for
value of any Equity Interests of the Company or any of its Restricted
Subsidiaries held by any member of the Company's or such Restricted Subsidiary's
management; PROVIDED that the aggregate price paid for all such repurchased,
redeemed, acquired or retired Equity Interests shall not exceed $1.0 million in
any fiscal year; (vi) retiring any Equity Interests of the Company to the extent
necessary (as determined in good faith by a majority of the disinterested
members of the Board of Directors, whose determination shall be evidenced by a
resolution thereof) to prevent the loss, or to secure the renewal or
reinstatement, of any license or franchise held by the Company or any Restricted
Subsidiary from any governmental agency; (vii) Investments in Telecommunications
Assets, PROVIDED that the aggregate fair market value (measured on the date each
such Investment was made or returned, as applicable), when taken together with
all other Investments made pursuant to this clause (vii) that are at the time
outstanding, does not exceed the sum of (y) $15.0 million, plus (z) the
aggregate amount equal to the net reduction in Investments made pursuant to this
clause (vii) on and after the Issue Date resulting from dividends,
distributions, interest payments, return of capital, repayments of such
Investments or Net Cash Proceeds realized by the Company or any Restricted
Subsidiary upon the sale of such Investment to a Person other than the Company
or any Subsidiary of the Company, except to the extent any such net reduction
amount is included in the amount calculated pursuant to clause (c) of the
preceding paragraph or any other clause of this paragraph; (viii) Investments in
Telecommunications Assets made after November 25, 1998 with the Net Cash
Proceeds, the fair market value of Telecommunications Assets or Equity Interests
of a Person that becomes a Restricted Subsidiary (PROVIDED the assets of such
Person consist entirely or substantially entirely of Telecommunications Assets)
received from the sale (other than to a Subsidiary of the Company) of Equity
Interests of the Company (other than any Disqualified Stock) and, PROVIDED,
FURTHER, that the amount of any such Net Cash Proceeds that are utilized for any
such Investment shall be excluded from clause (c) of the preceding paragraph and
each other clause of this paragraph; (ix) Investments in ION, PROVIDED that the
aggregate fair market value thereof (measured on the date each such Investment
was made or returned, as applicable), when taken together with all other
Investments made pursuant to this clause (ix) does not exceed the sum of (I)
$15.0 million, plus, (II) for each fiscal year, an amount equal to the amount of
cash received by the Company or any of its Restricted Subsidiaries from ION or
any of its Subsidiaries during such fiscal year except to the extent any such
amount is included in the amount calculated pursuant to clause (c) of the
preceding paragraph or any other clause of this paragraph during such fiscal
year plus, (III) to the extent necessary to pay reasonable and necessary
operating expenses of ION, an amount not to exceed $1.0 million in each fiscal
year; and (x) Investments in the German Joint Venture, PROVIDED that the
aggregate fair market value (measured on the date each such Investment was made
or returned, as applicable), when taken together with all other Investments made
pursuant to this clause (x) that are at the time outstanding, does not exceed
the sum of (y) $100.0 million, plus (z) the aggregate amount equal to the net
reduction in Investments made pursuant to this clause (x) on and after the Issue
Date resulting from dividends, distributions, interest payments, return of
capital, repayments of such Investments or Net Cash Proceeds realized by the
Company or any Restricted Subsidiary upon the sale of such Investment to a
Person other than the Company or any Subsidiary of the Company, except to the
extent such amount is included in the amount calculated pursuant to clause (c)
of the preceding paragraph or any other clause of this paragraph.

    The Board of Directors may not designate any Subsidiary of the Company
(other than a newly created Subsidiary in which no Investment has previously
been made (other than any de minimus amount required to capitalize such
Subsidiary in connection with its organization)) as an Unrestricted Subsidiary
(a "Designation") unless: (i) no Default or Event of Default shall have occurred
and be continuing at the time of or after giving effect to such Designation;
(ii) the Company would, immediately after giving effect to such Designation,
have been permitted to incur at least $1.00 of additional Indebtedness pursuant
to either clause (i) or (ii) of the first paragraph of the covenant described
below under the caption

                                      S-83
<PAGE>
"--Incurrence of Indebtedness and Issuance of Preferred Stock" and (iii) the
Company would not be prohibited under the Indenture from making an Investment at
the time of such Designation (assuming the effectiveness of such Designation for
purposes of this covenant) in an amount equal to the fair market value of the
net Investment of the Company and all Restricted Subsidiaries in such Subsidiary
on such date.

    In the event of any such Designation, all outstanding Investments owned by
the Company and its Restricted Subsidiaries in the Subsidiary so designated will
be deemed to be an Investment made as of the time of such Designation and will
reduce the amount available for Restricted Payments under the first or second
paragraph of this covenant or Investments, as applicable. All such outstanding
Investments will be deemed to constitute Restricted Payments in an amount equal
to the fair market value of such Investments at the time of such Designation.

    The Indenture will further provide that a Designation may be revoked and an
Unrestricted Subsidiary may thus be redesignated as a Restricted Subsidiary (a
"Revocation") by a resolution of the Board of Directors delivered to the
Trustee; PROVIDED that the Company will not make any Revocation unless: (i) no
Default or Event of Default shall have occurred and be continuing at the time of
or after giving effect to such Designation; and (ii) all Liens and Indebtedness
of such Unrestricted Subsidiary outstanding immediately following such
Revocation would, if incurred at such time, have been permitted to be incurred
at such time for all purposes under the Indenture.

    The amount of all Restricted Payments (other than cash) shall be the fair
market value on the date of the Restricted Payment of the asset(s) or securities
proposed to be transferred or issued by the Company (or such Restricted
Subsidiary, as the case may be) pursuant to the Restricted Payment. The fair
market value of any asset(s) or securities that are required to be valued by
this covenant shall be determined in good faith by the Board of Directors (such
determination to be based upon an opinion or appraisal issued by an accounting,
appraisal or investment banking firm of national standing if such fair market
value exceeds $15.0 million).

    INCURRENCE OF INDEBTEDNESS AND ISSUANCE OF PREFERRED STOCK

    The Company will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, create, incur, issue, assume, guarantee or otherwise
become directly or indirectly liable, contingently or otherwise (including by
way of merger, consolidation or acquisition), with respect to (collectively,
"incur") any Indebtedness and the Company will not issue or incur any
Disqualified Stock and will not permit any of its Restricted Subsidiaries to
issue or incur any shares of Preferred Stock; PROVIDED, HOWEVER, that the
Company may incur Indebtedness or issue or incur shares of Disqualified Stock
and its Restricted Subsidiaries may incur Acquired Debt or Acquired Preferred
Stock if either:

    (i) the Consolidated Leverage Ratio at the end of the Company's most
        recently ended fiscal quarter (the "Reference Period") for which a
        consolidated balance sheet of the Company is available immediately
        preceding the date on which such additional Indebtedness is incurred or
        such Preferred Stock is issued or incurred would have been less than 5.5
        to 1.0 (if the Reference Period ends on or prior to December 31, 2001),
        or 5.0 to 1.0 (if the Reference Period ends subsequent to December 31,
        2001), determined on a pro forma basis (including a pro forma
        application of the net proceeds therefrom), as if the additional
        Indebtedness had been incurred, or the Preferred Stock had been issued,
        as the case may be, at the beginning of the Reference Period; or

    (ii) the Consolidated Capital Ratio at the end of the Reference Period would
         have been less than 2.0 to 1.0, determined after giving effect to the
         incurrence or issuance of such Indebtedness or Preferred Stock and, to
         the extent set forth in the definitions used herein, on a pro forma
         basis (including a pro forma application of the net proceeds
         therefrom).

                                      S-84
<PAGE>
    Notwithstanding the foregoing, the provisions of the paragraph set forth
immediately above will not prohibit the incurrence of any of the following items
of Indebtedness (collectively, "Permitted Indebtedness"):

    (a) the incurrence by the Company of Indebtedness represented by the Notes;

    (b) the incurrence by the Company or any of its Restricted Subsidiaries of
       Existing Indebtedness;

    (c) the incurrence of Indebtedness by the Company to any Consolidated
       Subsidiary or Indebtedness of any Restricted Subsidiary to the Company or
       any Consolidated Subsidiary (but such Indebtedness shall be deemed to be
       incurred upon such Indebtedness being held by any person other than the
       Company or such Consolidated Subsidiary including upon Designation and
       upon such Restricted Subsidiary otherwise no longer being a Consolidated
       Subsidiary); PROVIDED that in the case of Indebtedness of the Company,
       such obligations shall be unsecured and subordinated in all respects to
       the Company's obligations pursuant to the Notes;

    (d) the incurrence by the Company of Indebtedness in an aggregate amount
       incurred and outstanding at any time pursuant to this clause (d) (plus
       any Permitted Refinancing Indebtedness and any other Indebtedness
       incurred to retire, defease, refinance, replace or refund such
       Indebtedness) of up to $25.0 million;

                                      S-85
<PAGE>
    (e) the incurrence by the Company, or any Guarantee thereof by any
       Restricted Subsidiary (other than any Foreign Subsidiary), of
       Indebtedness pursuant to the Credit Agreement in an aggregate amount
       incurred and outstanding at any time pursuant to this clause (e) (plus
       any Permitted Refinancing Indebtedness and any other Indebtedness
       incurred to retire, defease, refinance, replace or refund such
       Indebtedness) of up to $300.0 million, minus the amount of any such
       Indebtedness (i) retired with the Net Cash Proceeds from any Asset Sale
       applied to permanently reduce the outstanding amounts or the commitments
       with respect to such Indebtedness pursuant to the covenant "Asset Sales"
       or (ii) assumed by a transferee in an Asset Sale;

    (f) the incurrence by the Company or any Foreign Subsidiaries of Purchase
       Money Indebtedness; PROVIDED that in each case, such Indebtedness shall
       not constitute more than 100% of the cost (determined in accordance with
       GAAP in good faith by the Board of Directors of the Company) to the
       Company or such Foreign Subsidiary, as applicable, of the property so
       purchased, developed, acquired, constructed, improved or leased;

    (g) the incurrence by the Company or any of its Restricted Subsidiaries of
       Hedging Obligations that are incurred for the purpose of fixing or
       hedging interest or foreign currency exchange rate risk with respect to
       any floating rate Indebtedness or foreign currency based Indebtedness,
       respectively, that is permitted by the terms of the Indenture to be
       outstanding; PROVIDEDthat the notional amount of any such Hedging
       Obligation does not exceed the amount of Indebtedness or other liability
       to which such Hedging Obligation relates;

    (h) the incurrence by a Foreign Subsidiary of Indebtedness pursuant to a
       Foreign Subsidiary Credit Agreement (or any Guarantee thereof by any
       other Foreign Subsidiary) in an aggregate principal amount incurred and
       outstanding at any time pursuant to this clause (h) (plus any Permitted
       Refinancing Indebtedness and any other Indebtedness incurred to retire,
       defease, refinance, replace or refund such Indebtedness) of up to
       $150.0 million (or the equivalent thereof at the time of incurrence in
       the applicable foreign currencies), minus the amount of any such
       Indebtedness (i) retired with the Net Cash Proceeds from any Asset Sale
       applied to permanently reduce the outstanding amounts or the commitments
       with respect to such Indebtedness pursuant to the covenant "Asset Sales"
       or (ii) assumed by a transferee of an Asset Sale;

    (i) the Company and its Restricted Subsidiaries may incur Indebtedness
       solely in respect of bankers acceptances, letters of credit and
       performance bonds, all in the ordinary course of business in accordance
       with customary industry practices, in amounts and for the purposes
       customary in the Company's industry (other than to the extent not
       supporting Indebtedness); and

    (j) the incurrence by the Company or any of its Restricted Subsidiaries, as
       applicable, of Permitted Refinancing Indebtedness in exchange for, or the
       net proceeds of which are used to, refund, refinance or replace
       Indebtedness that was incurred pursuant to the first paragraph hereof or
       clauses (a), (b), (d), (e), (f), (h) or this clause (j) of this
       paragraph.

    Indebtedness or Preferred Stock of any Person which is outstanding at the
time such Person becomes a Restricted Subsidiary of the Company (including upon
designation of any Subsidiary or other Person as a Restricted Subsidiary or upon
a Revocation such that such Subsidiary becomes a Restricted Subsidiary) or is
merged with or into or consolidated with the Company or a Restricted Subsidiary
of the Company shall be deemed to have been incurred at the time such Person
becomes such a Restricted Subsidiary of the Company or is merged with or into or
consolidated with the Company or a Restricted Subsidiary of the Company, as
applicable.

    Upon each incurrence, the Company may designate pursuant to which provision
of this covenant such Indebtedness is being incurred and such Indebtedness shall
not be deemed to have been incurred by the Company under any other provision of
this covenant, except as stated otherwise in the foregoing provisions.

                                      S-86
<PAGE>
    The Company will not, and will not permit any of its Restricted Subsidiaries
to, incur any Indebtedness (including Permitted Indebtedness) that is
contractually subordinated in right of payment to any other Indebtedness of the
Company unless such Indebtedness is also contractually subordinated in right of
payment to the Notes on substantially identical terms; PROVIDED, HOWEVER, that
no Indebtedness of the Company shall be deemed to be contractually subordinated
in right of payment to any other Indebtedness of the Company solely by virtue of
being unsecured.

    LIENS

    The Company will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, create, incur, assume or otherwise cause or suffer
to exist or become effective any Lien of any kind (other than Permitted Liens)
upon any of their property or assets, now owned or hereafter acquired, or upon
any income or profits therefrom unless all payments due under the Indenture and
the Notes are secured (except as provided in the next clause) on an equal and
ratable basis with the obligations so secured and no Lien shall be granted or be
allowed to exist which secures Subordinated Indebtedness except with respect to
Acquired Debt, in which case, however, such Liens must be made junior and
subordinate to the Liens granted to the Holders of the Notes.

    DIVIDEND AND OTHER PAYMENT RESTRICTIONS AFFECTING RESTRICTED SUBSIDIARIES

    The Company will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, create or otherwise cause or suffer to exist or
become effective any encumbrance or restriction on the ability of any Restricted
Subsidiary to (i)(a) pay dividends or make any other distributions to the
Company or any of its Restricted Subsidiaries (1) on its Capital Stock or
(2) with respect to any other interest or participation in, or measured by, its
profits, or (b) pay any indebtedness owed to the Company or any of its
Restricted Subsidiaries, (ii) make loans or advances to the Company or any of
its Restricted Subsidiaries or (iii) transfer any of its properties or assets to
the Company or any of its Restricted Subsidiaries. However, the foregoing
restrictions will not apply to encumbrances or restrictions existing under or by
reason of (a) Existing Indebtedness as in effect on the Issue Date, (b) the
Indenture and the Notes and Indebtedness ranking PARI PASSU with the Notes
provided such provisions are no more restrictive than the Notes, (c) the Credit
Agreement, any Foreign Subsidiary Credit Agreement, PROVIDED that the
restrictions contained in the Credit Agreement are no more restrictive, taken as
a whole, than those contained in a credit agreement with terms that are
commercially reasonable for a borrower that has substantially comparable
Indebtedness, and PROVIDED, FURTHER, that no such provision shall prohibit or
restrict the ability of any Restricted Subsidiary to pay dividends or make other
upstream distributions or other payments to the Company or any of its Restricted
Subsidiaries, (d) applicable law, (e) any instrument governing Indebtedness or
Capital Stock of a Person or assets acquired by the Company or any of its
Restricted Subsidiaries as in effect at the time of such acquisition (except to
the extent such Indebtedness was incurred in connection with or in contemplation
of such acquisition), which encumbrance or restriction is not applicable to any
Person, or the properties or assets of any Person, other than the Person, or the
property or assets of the Person, so acquired; PROVIDED, that in the case of
Indebtedness, such Indebtedness was permitted by the terms of the Indenture to
be incurred, (f) customary non-assignment provisions in leases entered into in
the ordinary course of business and consistent with past practices,
(g) purchase money obligations (including pursuant to Purchase Money
Indebtedness obligations) for property acquired in the ordinary course of
business that impose restrictions of the nature described in clause (iii) above
on the property so acquired, constructed, leased or improved, (h) any agreement
for the sale or other disposition of a Restricted Subsidiary that restricts
distributions by that Restricted Subsidiary pending its sale or other
disposition, provided that the consummation of such transaction would not result
in an Event of Default or an event that, with the passing of time or giving of
notice or both, would constitute an Event of Default, that such restriction
terminates if such transaction is not consummated and that the consummation or
abandonment of such transaction occurs within one year of the date such
agreement was entered into, (i) Permitted Refinancing Indebtedness, PROVIDED
that the restrictions contained in the agreements

                                      S-87
<PAGE>
governing such Permitted Refinancing Indebtedness are no more restrictive, taken
as a whole, than those contained in the agreements governing the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded, (j) Liens
securing Indebtedness otherwise permitted to be incurred pursuant to the
provisions of the covenant described above under the caption "--Liens" that
limit the right of the Company or any of its Restricted Subsidiaries to dispose
of the assets subject to such Lien, (k) provisions with respect to the
disposition or distribution of assets or property in joint venture agreements
and other similar agreements entered into in the ordinary course of business,
and (l) restrictions on cash or other deposits or net worth imposed by customers
under contracts entered into in the ordinary course of business.

    MERGER, CONSOLIDATION, OR SALE OF ASSETS

    The Company may not, directly or indirectly, consolidate or merge with or
into (whether or not the Company is the surviving corporation), or sell, assign,
transfer, convey or otherwise dispose of all or substantially all of its
properties or assets, in one or more related transactions, to another Person
unless: (i) the Company is the surviving corporation or the Person formed by or
surviving any such consolidation or merger (if other than the Company) or to
which such sale, assignment, transfer, conveyance or other disposition shall
have been made is a corporation organized or existing under the laws of the
United States, any state thereof or the District of Columbia; (ii) the Person
formed by or surviving any such consolidation or merger (if other than the
Company) or the Person to which such sale, assignment, transfer, conveyance or
other disposition shall have been made assumes all the obligations of the
Company under the Notes and the Indenture pursuant to a supplemental indenture
in a form reasonably satisfactory to the Trustee; (iii) no Default or Event of
Default (or an event that, with the passing of time or giving of notice or both,
would constitute an Event of Default) shall exist or shall occur immediately
after giving effect on a pro forma basis to such transaction; (iv) except in the
case of a merger of the Company with or into a Wholly Owned Restricted
Subsidiary of the Company, the Company or the Person formed by or surviving any
such consolidation or merger (if other than the Company), or to which such sale,
assignment, transfer, conveyance or other disposition shall have been made will
immediately after such transaction and after giving pro forma effect thereto and
any related financing transactions as if the same had occurred at the beginning
of the applicable period, be permitted to incur at least $1.00 of additional
Indebtedness pursuant to either clause (i) or (ii) of the first paragraph of the
covenant described above under the caption "--Incurrence of Indebtedness and
Issuance of Preferred Stock"; (v) if, as a result of any such transaction,
property or assets of the Company would become subject to a Lien subject to the
provisions of the Indenture described under "--Liens" above, the Company or the
successor entity to the Company shall have secured the Notes as required by said
covenant; and (vi) the Company shall have delivered to the Trustee an Officers'
Certificate and an opinion of counsel, each stating that such consolidation,
merger or transfer and such supplemental indenture (if any) comply with the
Indenture. The Indenture will also provide that the Company may not, directly or
indirectly, lease all or substantially all of its properties or assets, in one
or more related transactions, to any other Person. The provisions of this
covenant will not be applicable to a sale, assignment, transfer, conveyance or
other disposition of assets solely between or among the Company and its Wholly
Owned Restricted Subsidiaries.

    Upon any consolidation or merger or any transfer of all or substantially all
of the assets of the Company in accordance with the foregoing, the successor
corporation formed by such consolidation or into which the Company is merged or
to which such transfer is made shall succeed to and (except in the case of a
lease) be substituted for, and may exercise every right and power of, the
Company under the Indenture with the same effect as if such successor
corporation had been named therein as the Company, and (except in the case of a
lease) the Company shall be released from the obligations under the Notes and
the Indenture except with respect to any obligations that arise from, or are
related to, such transaction.

    For purposes of the foregoing, the transfer (by assignment, sale or
otherwise) of all or substantially all of the properties and assets of one or
more Subsidiaries, the Company's interest in which constitutes all or

                                      S-88
<PAGE>
substantially all of the properties and assets of the Company, shall be deemed
to be the transfer of all or substantially all of the properties and assets of
the Company.

    TRANSACTIONS WITH AFFILIATES

    The Company will not, and will not permit any of its Restricted Subsidiaries
to, make any payment to, or sell, lease, transfer or otherwise dispose of any of
its properties or assets to, or purchase any property or assets from, or enter
into or make or amend any transaction, contract, agreement, understanding, loan,
advance or guarantee with, or for the benefit of, any Affiliate (each of the
foregoing, an "Affiliate Transaction"), unless (i) such Affiliate Transaction is
on terms that are not materially less favorable to the Company or the relevant
Restricted Subsidiary than those that would have been obtained in a comparable
transaction by the Company or such Restricted Subsidiary with an unrelated
Person and (ii) with respect to any Affiliate Transaction or series of related
Affiliate Transactions (A) involving aggregate consideration in excess of
$5.0 million, the Company delivers to the Trustee a resolution of the Board of
Directors set forth in an Officers' Certificate that such Affiliate Transaction
is approved by a majority of the disinterested members of the Board of Directors
and that, except with respect to matters governed by the Management Agreement,
certifying that such Affiliate Transaction complies with clause (i) above and is
in the best interests of the Company or such Restricted Subsidiary and (B) if
involving aggregate consideration in excess of $15.0 million, a favorable
written opinion as to the fairness to the Company of such Affiliate Transaction
from a financial point of view is also obtained by the Company from an
accounting, appraisal or investment banking firm of national standing with a
copy delivered to the Trustee. Notwithstanding the foregoing, the following
items shall not be deemed to be Affiliate Transactions: (i) (a) the entering
into, maintaining or performance of any employment contract, collective
bargaining agreement, benefit plan, program or arrangement, related trust
agreement or any other similar arrangement for or with any employee, officer or
director heretofore or hereafter entered into in the ordinary course of
business, including vacation, health, insurance, deferred compensation,
retirement, savings or other similar plans, (b) the payment of compensation,
performance of indemnification or contribution obligations, or an issuance,
grant or award of stock, options, or other equity-related interests or other
securities, to employees, officers or directors in the ordinary course of
business, (c) any transaction with an officer or director in the ordinary course
of business not involving more than $100,000 in any one case, or (d) Management
Advances and payments in respect thereof, (ii) transactions between or among the
Company and/or its Restricted Subsidiaries, (iii) payment of reasonable
directors fees, (iv) any sale or other issuance of Equity Interests (other than
Disqualified Stock) of the Company, (v) Affiliate Transactions in effect or
approved by the Board of Directors on the Issue Date, including any amendments
thereto (PROVIDED that the terms of such amendments are not materially less
favorable to the Company than the terms of such agreement prior to such
amendment), (vi) transactions with respect to capacity between the Company or
any Restricted Subsidiary and any Unrestricted Subsidiary or another Affiliate
and joint sales and marketing pursuant to an agreement or agreements between the
Company or any Restricted Subsidiary and any Unrestricted Subsidiary or another
Affiliate (PROVIDED that in the case of this clause (vi), such agreements are on
terms that are no less favorable to the Company or the relevant Restricted
Subsidiary than those that could have been obtained at the time of such
transaction in an arm's-length transaction with an unrelated third party or, in
the case of a transaction with an Unrestricted Subsidiary, ION or an other
Affiliate, are either (x) entered into in connection with a transaction
involving the selection by a customer of cable system capacity entered into in
the ordinary course of business or (y) involve the provision by the Company or a
Restricted Subsidiary to an Unrestricted Subsidiary, ION or an other Affiliate
of sales and marketing services, operations, administration and maintenance
services or development services for which the Company or such Restricted
Subsidiary receives a fair rate of return (as determined by the Board of
Directors and set forth in an Officers' Certificate delivered to the Trustee)
above its expenses of providing such services), and (vii) Restricted Payments
that are permitted by the covenant described above under the caption
"--Restricted Payments."

                                      S-89
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    BUSINESS ACTIVITIES

    The Company will not, and will not permit any of its Restricted Subsidiaries
to, engage, to more than a de minimus extent, in any business other than a
Telecommunications Business.

    PAYMENTS FOR CONSENT

    Neither the Company nor any of its Restricted Subsidiaries will, directly or
indirectly, pay or cause to be paid any consideration, whether by way of
interest, fee or otherwise, to any Holder of any Notes for or as an inducement
to any consent, waiver or amendment of any of the terms or provisions of the
Indenture or the Notes unless such consideration is offered to be paid or is
paid to all Holders of the Notes that consent, waive or agree to amend such
terms or provisions of the Indenture or the Notes in the time frame set forth in
the solicitation documents relating to such consent, waiver or agreement.

    REPORTS

    Whether or not required by the rules and regulations of the Commission, so
long as any Notes are outstanding, the Company will furnish to the Trustee and
the Holders of the Notes (i) all quarterly and annual financial information that
would be required to be contained in a filing with the Commission on Forms 10-Q
and 10-K if the Company were required to file such Forms, including a
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" that describes the financial condition and results of operations of
the Company and its consolidated Subsidiaries and, with respect to the annual
information only, a report thereon by the Company's certified independent
accountants, and (ii) all current reports that would be required to be filed
with the Commission on Form 8-K if the Company were required to file such
reports, in each case within the time periods specified in the Commission's
rules and regulations.

EVENTS OF DEFAULT AND REMEDIES

    The Indenture will provide that each of the following will constitute an
Event of Default: (i) default for 30 days in the payment when due of interest on
the Notes; (ii) default in the payment when due of the principal of, or premium,
if any, on, the Notes; (iii) failure by the Company or any of its Restricted
Subsidiaries to comply with the provisions described above under the captions
"--Change of Control," or "--Asset Sales"; (iv) failure by the Company or any of
its Restricted Subsidiaries for 60 days after notice to comply with any of its
other agreements in the Indenture or the Notes; (v) default under any mortgage,
indenture or instrument under which there may be issued or by which there may be
secured or evidenced any Indebtedness for money borrowed by the Company or any
of its Restricted Subsidiaries (or the payment of which is Guaranteed by the
Company or any of its Restricted Subsidiaries) whether such Indebtedness or
Guarantee now exists, or is created after the Issue Date, which default results
in the acceleration of such Indebtedness prior to its express maturity and, in
each case, the amount of any such Indebtedness, together with the amount of any
other such Indebtedness or the maturity of which has been so accelerated,
aggregates $15 million or more; (vi) failure by the Company or any of its
Restricted Subsidiaries to pay final judgments not subject to appeal aggregating
in excess of $15 million (net of applicable insurance coverage which is
acknowledged in writing by the insurer), which judgments are not paid, vacated,
discharged or stayed for a period of 60 days; and (vii) certain events of
bankruptcy or insolvency with respect to the Company or any of its Restricted
Subsidiaries.

    If any Event of Default occurs and is continuing, the Trustee or the Holders
of at least 25% in principal amount of the then outstanding Notes may declare
all the Notes to be due and payable immediately. Notwithstanding the foregoing,
in the case of an Event of Default arising from certain events of bankruptcy or
insolvency, with respect to the Company, any Restricted Subsidiary that is a
Significant Subsidiary or any group of Restricted Subsidiaries that, taken
together, would constitute a Significant Subsidiary, all outstanding Notes will
become due and payable without further action or notice. Holders of the Notes
may not enforce the Indenture or the Notes except as provided in the Indenture.
Subject to certain limitations, Holders of a majority in principal amount of the
then outstanding Notes may direct the

                                      S-90
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Trustee in its exercise of any trust or power. The Trustee may withhold from
Holders of the Notes notice of any continuing Default or Event of Default
(except a Default or Event of Default relating to the payment of principal of,
premium, if any, or interest on, the Notes) if it determines that withholding
notice is in their interest.

    The Holders of a majority (or super majority of at least 66 2/3% in the case
of any covenant requiring 66 2/3% to amend) in aggregate principal amount of the
then outstanding Notes by notice to the Trustee may on behalf of the Holders of
all of the Notes waive any existing Default or Event of Default and its
consequences under the Indenture, except a continuing Default or Event of
Default in the payment of principal of, premium, if any, or interest on the
Notes.

    The Company will be required to deliver to the Trustee annually a statement
regarding compliance with the Indenture, and the Company will be required upon
becoming aware of any Default or Event of Default to deliver to the Trustee a
statement specifying such Default or Event of Default.

NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS, EMPLOYEES, INCORPORATORS OR
  SHAREHOLDERS

    No director, officer, employee, incorporator or shareholder of the Company,
as such, will have any liability for any obligations of the Company with respect
to the Notes or the Indenture, or for any claim based on, or in respect or by
reason of, such obligations or their creation. Each Holder of Notes by accepting
a Note will waive and release any and all such liability. Such waiver and
release are part of the consideration for issuance of the Notes. Such waiver may
not be effective to waive liabilities under federal securities laws and it is
the view of the Commission that such a waiver is against public policy.

LEGAL DEFEASANCE AND COVENANT DEFEASANCE

    The Indenture will be discharged and cancelled upon the delivery by the
Company to the Trustee for cancellation of all the Notes or upon irrevocable
deposit with the Trustee, within not more than one year prior to the final
stated maturity of the Notes, or when the Notes are to be called for redemption
within one year under arrangements satisfactory to the Trustee, of funds
sufficient for the payment or redemption of all the Notes. In addition, the
Indenture will provide that the Company may, at its option and at any time,
elect to have all of its obligations discharged with respect to the outstanding
Notes ("Legal Defeasance"), except for: (i) the rights of Holders of outstanding
Notes to receive payments in respect of the principal of, premium, if any, and
interest on such Notes when such payments are due from the trust referred to
below; (ii) the Company's obligations with respect to the Notes concerning
issuing temporary Notes, registration of Notes, mutilated, destroyed, lost or
stolen Notes and the maintenance of an office or agency for payment and money
for security payments held in trust; (iii) the rights, powers, trusts, duties
and immunities of the Trustee, and the Company's obligations in connection
therewith; and (iv) the Legal Defeasance provisions of the Indenture. In
addition, the Company may, at its option and at any time, elect to have its
obligations released with respect to certain covenants that are contained in the
Indenture ("Covenant Defeasance") and, thereafter, any omission to comply with
such obligations will not constitute a Default or Event of Default. In the event
Covenant Defeasance occurs, certain events (but not including non-payment,
bankruptcy, receivership, rehabilitation or insolvency events) described under
"--Events of Default and Remedies" will no longer constitute an Event of
Default.

    In order to exercise either Legal Defeasance or Covenant Defeasance,
(i) the Company must irrevocably deposit, or cause to be deposited, with the
Trustee, in trust, for the benefit of the Holders of the Notes, (a) cash in U.S.
dollars, non-callable Government Securities, or a combination thereof (with
respect to the Dollar Notes) and (b) legal tender in the countries constituting
the European Monetary Union, EEA Government Obligations, or a combination
thereof (with respect to the Euro Notes), in all cases in such amounts as will
be sufficient, in the opinion of a nationally recognized firm of independent
public accountants, to pay the principal of, premium, if any, and interest on
the outstanding Notes on the stated maturity thereof or on the applicable
redemption date, as the case may be, and the Company must specify whether the
Notes are being defeased to maturity or to a particular redemption date;
(ii) in the case of Legal Defeasance, the Company must deliver to the Trustee an
opinion of counsel in the United States

                                      S-91
<PAGE>
reasonably acceptable to the Trustee confirming that, since the Issue Date, the
Company has received from, or there has been published by, the Internal Revenue
Service a ruling, or there has been a change in the applicable United States
federal income tax law, in either case to the effect that, and based thereon
such opinion of counsel shall confirm that, the Holders of the outstanding Notes
will not recognize income, gain or loss for United States federal income tax
purposes as a result of such Legal Defeasance, and will be subject to United
States federal income tax on the same amounts, in the same manner and at the
same times as would have been the case if such Legal Defeasance had not
occurred; (iii) in the case of Covenant Defeasance, the Company must deliver to
the Trustee an opinion of counsel in the United States reasonably acceptable to
the Trustee confirming that the Holders of the outstanding Notes will not
recognize income, gain or loss for United States federal income tax purposes as
a result of such Covenant Defeasance, and such Holders will be subject to United
States federal income tax on the same amounts, in the same manner and at the
same times as would have been the case if such Covenant Defeasance had not
occurred; (iv) no Default or Event of Default shall have occurred and be
continuing on the date of such deposit (other than a Default or Event of Default
resulting from the borrowing of funds to be applied to such deposit) or insofar
as Events of Default from bankruptcy or insolvency events are concerned, at any
time in the period ending on the 91st day after the date of deposit; (v) such
Legal Defeasance or Covenant Defeasance will not result in a breach or violation
of, or constitute a default under, any material agreement or instrument (other
than the Indenture) to which the Company or any of its Restricted Subsidiaries
is a party or by which the Company or any of its Restricted Subsidiaries is
bound; (vi) the Company must deliver to the Trustee an Officers' Certificate
stating that the deposit was not made by the Company with the intent of
preferring the Holders of the Notes over other creditors of the Company, or with
the intent of defeating, hindering, delaying or defrauding creditors of the
Company or others; and (vii) the Company must deliver to the Trustee an
Officers' Certificate and an opinion of counsel in the United States reasonably
acceptable to the Trustee, each stating that the conditions precedent provided
for or relating to Legal Defeasance or Covenant Defeasance, as applicable, in
the case of the Officers' Certificate, in clauses (i) through (vi) and, in the
case of the opinion of counsel, in clauses (i) (with respect to the validity and
perfection of the security interest) and clauses (ii) and (iii) of this
paragraph, have been complied with.

TRANSFER AND EXCHANGE

    A Holder may transfer or exchange Notes in accordance with the procedures
set forth in the Indenture. The Registrar and the Trustee may require a Holder,
among other things, to furnish appropriate endorsements and transfer documents,
and the Company may require a Holder to pay any taxes and fees required by law
or permitted by the Indenture. The Company will not be required to transfer or
exchange any Note selected for redemption. Also, the Company will not be
required to transfer or exchange any Note for a period of 15 days before (i) a
selection of Notes to be redeemed, (ii) an interest payment date or (iii) the
mailing of notice of a Change of Control Offer or Asset Sale Offer. The
registered Holder of a Note will be treated as the owner of it for all purposes
under the Indenture. Except in the limited circumstances described below under
"--Book-Entry, Delivery and Form," owners of beneficial interests in Global
Notes will not be entitled to receive physical delivery of certificated notes.
Transfers of beneficial interests in Global Notes will be subject to the
applicable rules and procedures of DTC, Euroclear and Cedelbank and their
respective direct or indirect participants, which rules and procedures may
change from time to time. If certificated Notes are issued, holders of such
certificated Notes will be able to transfer their Notes in New York and, so long
as the Notes are listed on the Luxembourg Stock Exchange, in Luxembourg in
accordance with the procedures set forth under "--Book-Entry, Delivery and Form
- --Certificated Notes."

AMENDMENT, SUPPLEMENT AND WAIVER

    The Indenture will contain provisions permitting the Company and the Trustee
to enter into a supplemental indenture for certain limited purposes without the
consent of the Holders. With the consent of the Holders of not less than a
majority in aggregate principal amount of the Notes at the time outstanding, the
Company and the Trustee are permitted to amend or supplement the Indenture or
any

                                      S-92
<PAGE>
supplemental indenture or modify the rights of the Holders; PROVIDED that no
such modification may, without the consent of Holders of at least 66 2/3% in
aggregate principal amount of Notes at the time outstanding, modify the
provisions (including the defined terms used therein) of the covenant
"Repurchase at the Option of the Holders--Change of Control" in a manner adverse
to the Holders or, except with respect to the Lien on the Security Account,
release or modify a Lien granted to the Holders of the Notes; and PROVIDED that
no such modification may, without the consent of each Holder affected thereby:
(i) change the Stated Maturity on any Note, or reduce the principal amount
thereof or the rate (or extend the time for payment) of interest thereon or any
premium payable upon the redemption at the option of the Company thereof, or
change the place of payment where, or the coin or currency in which, any Note or
any premium or the interest thereon is payable, or impair the right to institute
suit for the enforcement of any such payment on or after the Stated Maturity
thereof (or, in the case of redemption at the option of the Company, on or after
the Redemption Date), or reduce the Change of Control Payment or the Asset Sale
Offer Price after the corresponding Asset Sale or Change of Control has
occurred, or (ii) alter the provisions (including the defined terms used
therein) regarding the right of the Company to redeem the Notes as a right, or
at the option, of the Company in a manner adverse to the Holders, or
(iii) reduce the percentage in principal amount of the outstanding Notes, the
consent of whose Holders is required for any such amendment, supplemental
indenture or waiver provided for in the Indenture, or (iv) modify any of the
waiver provisions, except to increase any required percentage or to provide that
certain other provisions of the Indenture cannot be modified or waived without
the consent of the Holder of each outstanding Note affected thereby, or
(v) cause the Notes to become subordinate in right of payment to any other
Indebtedness.

    Notwithstanding the foregoing, without the consent of any Holder of Notes,
the Company and the Trustee may amend or supplement the Indenture or the Notes
to cure any ambiguity, defect or inconsistency, to provide for uncertificated
Notes in addition to or in place of certificated Notes, to provide for the
assumption of the Company's obligations to Holders of Notes in the case of a
merger or consolidation or sale of all or substantially all of the Company's
assets in accordance with the terms of the Indenture, to make any change that
would provide any additional rights or benefits to the Holders of Notes or that
does not adversely affect the legal rights under the Indenture of any such
Holder, or to comply with the requirements of the Commission in order to effect
or maintain the qualification of the Indenture under the Trust Indenture Act.

CONCERNING THE TRUSTEE

    The Trustee, The Bank of New York, is organized under the laws of the State
of New York, with offices located at 101 Barclay Street, Floor 21 West, New
York, New York 10286. The Indenture contains certain limitations on the rights
of the Trustee, should it become a creditor of the Company, to obtain payment of
claims in certain cases, or to realize on certain property received in respect
of any such claim as security or otherwise. The Trustee will be permitted to
engage in other transactions; however, if it acquires any conflicting interest,
it must eliminate such conflict within 90 days, apply to the Commission for
permission to continue, or resign.

    The Holders of a majority in principal amount of the then outstanding Notes
will have the right to direct the time, method and place of conducting any
proceeding for exercising any remedy available to the Trustee, subject to
certain exceptions. In case an Event of Default shall occur (which shall not be
cured), the Trustee will be required, in the exercise of its power, to use the
degree of care of a prudent person in the conduct of their own affairs. Subject
to such provisions, the Trustee will be under no obligation to exercise any of
its rights or powers under the Indenture at the request of any Holder of Notes,
unless such Holder shall have offered to the Trustee security and indemnity
satisfactory to it against any loss, liability or expense.

                                      S-93
<PAGE>
GOVERNING LAW

    The Indenture and the Notes will be governed by and construed in accordance
with the laws of the State of New York.

    The Company will submit to the jurisdiction of the U.S. federal and New York
state courts located in the Borough of Manhattan, City and State of New York for
purposes of all legal actions and proceedings instituted in connection with the
Notes and the Indenture.

CERTAIN DEFINITIONS

    Set forth below are certain defined terms used in the Indenture. Reference
is made to the Indenture for a full disclosure of all such terms, as well as any
other capitalized terms used herein for which no definition is provided.

    "ACQUIRED DEBT" or "ACQUIRED PREFERRED STOCK" means, with respect to any
specified Person, Indebtedness or Preferred Stock of any other Person existing
at the time such other Person is merged with or into or became a Subsidiary of
such specified Person (including by Designation or Revocation), provided such
Indebtedness or Preferred Stock is not incurred in connection with, or in
contemplation of, such other Person merging with or into or becoming a
Subsidiary of such specified Person.

    "AFFILIATE" of any specified Person means any other Person directly or
indirectly controlling, controlled by or under direct or indirect common control
with such specified Person. For purposes of this definition, "control"
(including, with correlative meanings, the terms "controlling," "controlled by"
and "under common control with"), as used with respect to any Person, shall mean
the possession, directly or indirectly, of the power to direct or cause the
direction of the management or policies of such Person, whether through the
ownership of voting securities, by agreement or otherwise; PROVIDED that
beneficial ownership of 10% or more of the Voting Stock of a Person shall be
deemed to be control.

    "ASSET SALE" means (i) the sale, lease, transfer, conveyance or other
disposition of any assets or rights (including, without limitation, by way of a
sale and leaseback) other than sales of inventory in the ordinary course of
business and other than any sale, lease, transfer, conveyance or other
disposition in the ordinary course of business of capacity on any fiber optic or
cable system owned, controlled or operated by the Company or any Restricted
Subsidiary or of telecommunications capacity, transmission rights, conduit or
rights-of-way acquired by the Company or any Restricted Subsidiary for use in a
Telecommunications Business of the Company or any Restricted Subsidiary
(PROVIDED that the sale, lease, transfer, conveyance or other disposition of all
or substantially all of the assets of the Company and its Restricted
Subsidiaries taken as a whole will be governed by the provisions of the
Indenture described above under the caption "--Repurchase at the Option of
Holders--Change of Control" and/or the provisions described above under the
caption "--Certain Covenants--Merger, Consolidation or Sale of Assets" and not
by the provisions of the Asset Sale covenant), and (ii) the issue or sale by the
Company or any of its Restricted Subsidiaries of Equity Interests of any
Subsidiary. Notwithstanding the foregoing, the following items shall not be
deemed to be Asset Sales: (i) a transfer of assets by the Company to a
Consolidated Subsidiary or by a Subsidiary to the Company or to a Consolidated
Subsidiary, (ii) an issuance of Equity Interests by a Subsidiary to the Company
or to a Consolidated Subsidiary, (iii) a Restricted Payment that is permitted by
the covenant described above under the caption "--Certain Covenants--Restricted
Payments," (iv) Permitted Investments made in accordance with clause (a) or
(c) of the definition thereof, (v) a disposition of obsolete or worn out
equipment or equipment that is no longer useful in the conduct of a
Telecommunications Business of the Company and its Restricted Subsidiaries and
that is disposed of in the ordinary course of business, (vi) the surrender or
waiver by the Company or any of its Restricted Subsidiaries of contract rights
or the settlement, release or surrender of contract, tort or other claims of any
kind by the Company or any of its Restricted Subsidiaries or the grant by the
Company or any of its Restricted Subsidiaries of a Lien not prohibited by the
Indenture, (vii) the sale of Cash Equivalents in the ordinary course of
business; and (viii) sales, transfers, assignments and other dispositions of
assets (or

                                      S-94
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related assets in related transactions) in the ordinary course of business with
an aggregate fair market value of less than $1.0 million.

    "BOARD OF DIRECTORS" means the board of directors or other governing body of
the Company or, if the Company is owned or managed by a single entity, the board
of directors or other governing body of such entity, or, in either case, any
committee thereof duly authorized to act on behalf of such board or governing
body.

    "BOARD RESOLUTION" means a duly authorized resolution of the Board of
Directors.

    "CAPITAL CONTRIBUTION" means any contribution to the equity of the Company
from a direct or indirect parent of the Company for which no consideration other
than the issuance of common stock with no redemption rights and no special
preferences, privileges or voting rights is given.

    "CAPITAL LEASE OBLIGATION" means, at the time any determination thereof is
to be made, the amount of the liability in respect of a capital lease that would
at such time be required to be capitalized on a balance sheet in accordance with
GAAP.

    "CAPITAL STOCK" means (i) in the case of a corporation, corporate stock,
(ii) in the case of an association or business entity, any and all shares,
interests, participations, rights or other equivalents (however designated) of
corporate stock, (iii) in the case of a partnership or limited liability
company, partnership or membership interests (whether general or limited) and
(iv) any other interest or participation that confers on a Person the right to
receive a share of the profits and losses of, or distributions of assets of, the
issuing Person.

    "CASH EQUIVALENTS" means (i) United States dollars and Euros,
(ii) securities issued or directly and fully guaranteed or insured by (a) the
United States government or any agency or instrumentality thereof (provided that
the full faith and credit of the United States is pledged in support thereof) or
(b) any member of the European Economic Area or Switzerland or any agency or
instrumentality thereof provided that such country, agency or instrumentality
has a credit rating at least equal to that of the United States of America
(provided, further, that the full faith and credit of such respective nation is
pledged in support thereof), in each case having maturities of not more than six
months from the date of acquisition, (iii) certificates of deposit and
eurodollar time deposits with maturities of six months or less from the date of
acquisition, bankers' acceptances with maturities not exceeding six months and
overnight bank deposits, in each case with any domestic commercial bank having
capital and surplus in excess of $500 million and a Thompson Bank Watch Rating
of "B" or better, (iv) repurchase obligations with a term of not more than seven
days for underlying securities of the types described in clause (ii) above
entered into with any financial institution meeting the qualifications specified
in clause (iii) above, (v) commercial paper having the highest rating obtainable
from Moody's Investors Service, Inc. or Standard & Poor's Ratings Group and in
each case maturing within six months after the date of acquisition and
(vi) money market funds at least 95% of the assets of which constitute Cash
Equivalents of the kinds described in clauses (i)-(v) of this definition,
PROVIDED that with respect to any Foreign Subsidiary, Cash Equivalents shall
also mean those investments that are comparable to clauses (iii) through
(vi) above in such Foreign Subsidiary's country of organization or country where
it conducts business operations.

    "CHANGE OF CONTROL" means the occurrence of any of the following: (i) any
"person" or "group" (as such terms are used in Section 13(d)(3) of the Exchange
Act), other than a Permitted Holder, is or becomes the beneficial owner,
directly or indirectly, of 35% or more of the Voting Stock (measured by voting
power rather than number of shares) of the Company and the Permitted Holders
own, in the aggregate, a lesser percentage of the total Voting Stock (measured
by voting power rather than by number of shares) of the Company than such person
and do not have the right or ability by voting power, contract or otherwise to
elect or designate for election a majority of the board of directors of the
Company (for the purposes of this clause, such other person shall be deemed to
"beneficially own" any Voting Stock of a specified corporation held by a parent
corporation if such other person beneficially owns, directly or

                                      S-95
<PAGE>
indirectly, more than 35% of the Voting Stock (measured by voting power rather
than by number of shares) of such parent corporation and the Permitted Holders
beneficially own, directly or indirectly, in the aggregate a lesser percentage
of Voting Stock (measured by voting power rather than by number of shares) of
such parent corporation and do not have the right or ability by voting power,
contract or otherwise to elect or designate for election a majority of the board
of directors of such parent corporation), (ii) during any period of two
consecutive years, Continuing Directors cease for any reason to constitute a
majority of the Board of Directors of the Company, (iii) the Company
consolidates or merges with or into any other Person, other than a consolidation
or merger (a) of the Company into a Wholly Owned Restricted Subsidiary of the
Company or (b) pursuant to a transaction in which the outstanding Voting Stock
of the Company is changed into or exchanged for cash, securities or other
property with the effect that the beneficial owners of the outstanding Voting
Stock of the Company immediately prior to such transaction, beneficially own,
directly or indirectly, at least a majority of the Voting Stock (measured by
voting power rather than number of shares) of the surviving corporation
immediately following such transaction or (iv) the sale, transfer, conveyance or
other disposition (other than by way of merger or consolidation), in one or a
series of related transactions, of all or substantially all of the assets of the
Company and its Restricted Subsidiaries taken as a whole to any person other
than a Wholly Owned Restricted Subsidiary of the Company or a Permitted Holder
or a person more than 50% of the Voting Stock (measured by voting power rather
than by number of shares) of which is owned, directly or indirectly, following
such transaction or transactions by the Permitted Holders; PROVIDED, HOWEVER,
that sales, transfers, conveyances or other dispositions in the ordinary course
of business of capacity on cable systems owned, controlled or operated by the
Company or any Restricted Subsidiary or fiber optic or of telecommunications
capacity or transmission rights, rights-of-way or conduit acquired by the
Company or any Restricted Subsidiary for use in the Telecommunications Business
of the Company or a Restricted Subsidiary, including, without limitation, for
sale, lease, transfer, conveyance or other disposition to any customer of the
Company or any Restricted Subsidiary shall not be deemed a disposition of assets
for purposes of this clause (iv).

    The definition of a Change of Control includes a phrase relating to the
sale, lease, transfer, conveyance or other disposition of "all or substantially
all" of the assets of the Company and its Restricted Subsidiaries taken as a
whole. The Indenture will be governed by New York law, and there is no clearly
established meaning under New York law of the phrase "substantially all" of the
assets of a corporation. Accordingly, the ability of a Holder of Notes to
require the Company to purchase such Notes as a result of a sale, lease,
transfer, conveyance or other disposition of less than all of the assets of the
Company and its Restricted Subsidiaries taken as a whole to another Person or
group may be uncertain.

    "CONSOLIDATED CAPITAL RATIO" means, with respect to the Company as of any
date, the ratio of (i) the aggregate consolidated amount of Indebtedness of the
Company and its Restricted Subsidiaries then outstanding to (ii) the
Consolidated Net Worth of the Company and its Consolidated Subsidiaries as of
such date.

    "CONSOLIDATED CASH FLOW" means, with respect to the Company for any period,
the Consolidated Net Income of the Company and its Consolidated Subsidiaries for
such period plus (A), to the extent that any of the following items were
deducted in computing such Consolidated Net Income, but without duplication,
(i) provision for taxes based on income or profits of the Company and its
Consolidated Subsidiaries for such period, plus (ii) consolidated interest
expense of the Company and its Consolidated Subsidiaries for such period,
whether paid or accrued and whether or not capitalized (including, without
limitation, amortization of debt issuance costs and original issue discount,
non-cash interest payments, the interest component of any deferred payment
obligations, the interest component of all payments associated with Capital
Lease Obligations, commissions, discounts and other fees and charges incurred in
respect of letter of credit or bankers' acceptance financings, and net payments
(if any) pursuant to Hedging Obligations), plus (iii) depreciation, amortization
(including amortization of goodwill and other intangibles and the amount of
capacity available for sale (other than for backhaul capacity) charged to cost
of sales), but excluding amortization of prepaid cash expenses that were paid in
a prior period), and other non-cash

                                      S-96
<PAGE>
expenses (excluding any such non-cash expense to the extent that it represents
an accrual of or reserve for cash expenses in any future period or amortization
of a prepaid cash expense that was paid in a prior period) of the Company and
its Consolidated Subsidiaries for such period, minus (B) non-cash items
increasing such Consolidated Net Income for such period (other than items that
were accrued in the ordinary course of business), in each case, on a
consolidated basis and determined in accordance with GAAP. Notwithstanding the
foregoing, the provision for taxes on the income or profits of, and the
depreciation and amortization and other non-cash expenses of, a Restricted
Subsidiary of the Company shall be added to Consolidated Net Income to compute
Consolidated Cash Flow of the Company only to the extent that a corresponding
amount would be permitted at the date of determination to be dividended to the
Company by such Restricted Subsidiary without prior governmental approval (that
has not been obtained), and without direct or indirect restriction pursuant to
the terms of its charter and all agreements, instruments, judgments, decrees,
orders, statutes, rules and governmental regulations applicable to that
Restricted Subsidiary or its shareholders.

    "CONSOLIDATED LEVERAGE RATIO" means, with respect to the Company, as of any
date, the ratio of (i) the aggregate consolidated amount of Indebtedness of the
Company and its Restricted Subsidiaries then outstanding to (ii) the annualized
Consolidated Cash Flow of the Company and its Consolidated Subsidiaries for the
most recently ended fiscal quarter.

    "CONSOLIDATED NET INCOME" means, with respect to the Company for any period,
the aggregate of the Net Income of the Company and its Consolidated Subsidiaries
for such period, on a consolidated basis, determined in accordance with GAAP;
PROVIDED that (i) the Net Income (but not loss) of any Person that is accounted
for by the equity method of accounting shall be included only to the extent of
the amount of dividends or distributions paid in cash to the Company or a
Consolidated Subsidiary thereof by such Person but not in excess of the
Company's Equity Interests in such Person, (ii) the Net Income of any Restricted
Subsidiary shall be excluded to the extent that the declaration or payment of
dividends or similar distributions by that Restricted Subsidiary of that Net
Income is not at the date of determination permitted without any prior
governmental approval (that has not been obtained) or, directly or indirectly,
by operation of the terms of its charter or any agreement, instrument, judgment,
decree, order, statute, rule or governmental regulation applicable to that
Restricted Subsidiary or its shareholders, except that the Company's equity in
the net income of any such Restricted Subsidiary for such period may be included
in such Consolidated Net Income up to the aggregate amount of cash that could
have been distributed by such Restricted Subsidiary during such period to the
Company as a dividend, (iii) the Net Income of any Person acquired in a pooling
of interests transaction for any period prior to the date of such acquisition
shall be excluded, (iv) the equity of the Company or any Restricted Subsidiary
in the net income (if positive) of any Unrestricted Subsidiary shall be included
in such Consolidated Net Income up to the aggregate amount of cash actually
distributed by such Unrestricted Subsidiary during such period to the Company or
a Consolidated Subsidiary as a dividend or other distribution (but not in excess
of the amount of the Net Income of such Unrestricted Subsidiary for such period)
and (v) the cumulative effect of a change in accounting principles shall be
excluded.

    "CONSOLIDATED NET WORTH" means, with respect to the Company as of any date,
the sum of (i) the consolidated equity of the common shareholders of the Company
and its Consolidated Subsidiaries that are Consolidated Subsidiaries as of such
date plus (ii) the respective amounts reported on the Company's balance sheet as
of such date with respect to any series of Preferred Stock (other than
Disqualified Stock) that by its terms is not entitled to the payment of
dividends unless such dividends may be declared and paid only out of net
earnings in respect of the year of such declaration and payment, but only to the
extent of any cash received by the Company upon issuance of such Preferred
Stock, less (x) all write-ups (other than write-ups resulting from foreign
currency translations and write-ups of tangible assets of a going concern
business made within 12 months after the acquisition of such business)
subsequent to the Issue Date in the book value of any asset owned by the Company
or a Restricted Subsidiary that is a Consolidated Subsidiary of the Company,
(y) all outstanding net Investments as of such date in unconsolidated Restricted

                                      S-97
<PAGE>
Subsidiaries and in Persons that are not Restricted Subsidiaries (except, in
each such case, Permitted Investments), and (z) all unamortized debt discount
and expense and unamortized deferred charges as of such date, all of the
foregoing determined in accordance with GAAP.

    "CONSOLIDATED SUBSIDIARY" means, for any Person, each Restricted Subsidiary
of such Person (whether now existing or hereafter created or acquired) the
financial statements of which are consolidated for financial statement reporting
purposes with the financial statements of such Person in accordance with GAAP.

    "CONTINUING DIRECTORS" means individuals who at the beginning of the period
of determination constituted the Board of Directors of the Company, together
with any new directors whose election by such Board of Directors or whose
nomination for election by the shareholders of the Company was approved by a
vote of a majority of the directors of the Company then still in office who were
either directors at the beginning of such period or whose election or nomination
for election was previously so approved or is the designee of any one of the
Permitted Holders or any combination thereof or was nominated or elected by any
such Permitted Holder(s) or any of their designees.

    "CREDIT AGREEMENT" means one or more credit agreements, loan agreements or
similar facilities, secured or unsecured, entered into from time to time by the
Company and its Restricted Subsidiaries, and including any related notes,
Guarantees, collateral documents, instruments and agreements executed in
connection therewith, as the same may be amended, supplemented, modified,
restated or replaced from time to time.

    "CURRENCY AGREEMENT" means, with respect to any Person, any foreign exchange
contract, currency swap agreement or other similar agreement as to which such
Person is a party or beneficiary.

    "DEFAULT" means any event that is, or with the passage of time or the giving
of notice or both would be, an Event of Default.

    "DISQUALIFIED STOCK" means any Capital Stock that, by its terms (or by the
terms of any security into which it is convertible, or for which it is
exchangeable, in each case at the option of the holder thereof), or upon the
happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the Holder
thereof, in whole or in part, on or prior to the date that is 91 days after the
date on which the Notes mature; PROVIDED, HOWEVER, that any Capital Stock that
would constitute Disqualified Stock solely because the holders thereof have the
right to require the Company to repurchase such Capital Stock upon the
occurrence of a Change of Control or an Asset Sale shall not constitute
Disqualified Stock if the terms of such Capital Stock provide that the Company
may not repurchase or redeem any such Capital Stock pursuant to such provisions
unless such repurchase or redemption complies with the covenant described above
under the caption "--Certain Covenants--Restricted Payments."

    "EEA GOVERNMENT OBLIGATION" means direct non-callable obligations of, or
non-callable obligations permitted by, any member nation of the European Union
of the payment of such obligation or guarantee the full faith and credit of the
respective nation is pledged, PROVIDED that such nation has a credit rating at
least equal to that of the highest rated member nation of the European Economic
Area.

    "EQUITY INTERESTS" means Capital Stock and all warrants, options or other
rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock).

    "EURO" OR "[EURO]" means the currency adopted by those countries
participating in the third stage of European Monetary Union.

    "EUROPEAN ECONOMIC AREA" means the member nations of the European Economic
Area pursuant to the Oporto Agreement on the European Economic Area dated
May 2, 1992 as amended.

                                      S-98
<PAGE>
    "EUROPEAN UNION" means the member nations to the third stage of economic and
monetary union pursuant to the Treaty of Rome establishing the European
Community, as amended by the Treaty on European Union, signed at Maastricht on
February 7, 1992.

    "EXISTING ASSETS" means property, plant and equipment and other tangible
business assets existing as of the Issue Date used in a Telecommunications
Business of the Company, but does not include cash or Cash Equivalents existing
on the Issue Date, and the proceeds from the sale, disposition or other transfer
of any Existing Assets outside the ordinary course of business.

    "EXISTING INDEBTEDNESS" means Indebtedness of the Company and its Restricted
Subsidiaries in existence on the Issue Date, until such amounts are repaid.

    "FOREIGN SUBSIDIARY" means any Restricted Subsidiary of the Company which
(i) is not organized under the laws of the United States, any state thereof or
the District of Columbia, and (ii) conducts substantially all of its business
operations outside the United States of America.

    "FOREIGN SUBSIDIARY CREDIT AGREEMENT" means one or more credit agreements,
loan agreements or similar facilities, secured or unsecured, entered into from
time to time by one or more of the Company's Foreign Subsidiaries, and including
any related notes, Guarantees, collateral documents, instruments and agreements
executed in connection therewith, as the same may be amended, supplemented,
modified, restated or replaced from time to time.

    "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as have been approved by a significant segment of the accounting
profession, which are in effect on the Issue Date.

    "GERMAN JOINT VENTURE" means the Person(s) formed or organized to engineer,
develop, construct and own the German Network.

    "GOVERNMENT SECURITIES" means securities that are (a) direct obligations (or
certificates representing an ownership interest in such obligations) of the
United States of America (including any agency or instrumentally thereof) of the
payment of which the full faith and credit of the United States of America is
pledged, (b) obligations of a Person controlled or supervised by and acting as
an agency or instrumentality of the United States of America the payment of
which is unconditionally guaranteed as a full faith and credit obligation by the
United States of America or (c) obligations of a Person the payment of which is
unconditionally guaranteed as a full faith and credit obligation by the United
States of America.

    "GUARANTEE" means any obligation, contingent or otherwise, of any Person
directly or indirectly guaranteeing any Indebtedness of any other Person (i) to
purchase or pay (or advance or supply funds for the purchase or payment of) such
Indebtedness of such other Person (whether arising by virtue of partnership
arrangements, or by agreement to keep-well, to purchase assets, goods,
securities or services, to take-or-pay, or to maintain financial statement
conditions or otherwise) or (ii) entered into for purposes of assuring in any
other manner the obligee of such Indebtedness of the payment thereof or to
protect such obligee against loss in respect thereof (in whole or in part);
PROVIDED, HOWEVER, that the term "Guarantee" shall not include endorsements for
collection or deposit in the ordinary course of business. The term "Guarantee"
used as a verb has a corresponding meaning.

    "HEDGING OBLIGATIONS" means, with respect to any Person, the obligations of
such Person under any Interest Rate Agreement or Currency Agreement.

    "INDEBTEDNESS" means, with respect to any Person, any indebtedness of such
Person, whether or not contingent, in respect of borrowed money or evidenced by
bonds, notes, debentures or similar instruments or letters of credit (or
reimbursement agreements in respect thereof) or banker's acceptances or
representing Capital Lease Obligations or the balance of the deferred and unpaid
of the purchase price of any

                                      S-99
<PAGE>
property or representing any Hedging Obligations, except any such balance that
constitutes an accrued expense or trade payable, if and to the extent any of the
foregoing (other than letters of credit (or reimbursement agreements in respect
thereof), banker's acceptances and Hedging Obligations) would appear as a
liability upon a balance sheet of such Person prepared in accordance with GAAP,
as well as all Indebtedness of others secured by a Lien on any asset of such
Person (whether or not such Indebtedness is assumed by such Person),
Disqualified Stock of such Person and Preferred Stock of such Person's
Restricted Subsidiaries and, to the extent not otherwise included, the Guarantee
by such Person of any Indebtedness of any other Person. The amount of any
Indebtedness outstanding as of any date shall be (i) the accreted value thereof,
in the case of any Indebtedness issued with original issue discount, but the
accretion of original issue discount in accordance with the original terms of
Indebtedness issued with an original issue discount will not be deemed to be an
incurrence, and (ii) the principal amount thereof, together with any interest
thereon that is more than 30 days past due, in the case of any other
Indebtedness.

    "INTEREST RATE AGREEMENT" means, with respect to any Person, any interest
rate protection agreement, interest rate future agreement, interest rate option
agreement, interest rate swap agreement, interest rate cap agreement, interest
rate collar agreement, interest rate hedge agreement or other similar agreement
or arrangement to which such Person is a party or beneficiary.

    "INVESTMENTS" means, with respect to any Person, all investments by such
Person in other Persons (including Affiliates) in the forms of direct or
indirect loans (including Guarantees of Indebtedness or other obligations),
advances or capital contributions (excluding commission, travel and similar
advances to directors, officers and employees made in the ordinary course of
business), purchases or other acquisitions for consideration of Indebtedness,
Equity Interests or other securities, together with all items that are or would
be classified as investments on a balance sheet prepared in accordance with
GAAP. If the Company or any of its Restricted Subsidiaries sells or otherwise
disposes of any Equity Interests of any direct or indirect Subsidiary such that,
after giving effect to any such sale or disposition, such Person is no longer a
Subsidiary of the Company or such Restricted Subsidiary, the Company shall be
deemed to have made an Investment on the date of any such sale or disposition
equal to the fair market value of the Equity Interests of such Subsidiary not
sold or disposed of in an amount determined as provided in the final paragraph
of the covenant described above under the caption "--Certain
Covenants--Restricted Payments."

    "ION" means International Optical Network, L.L.C., a Delaware limited
liability company.

    "ISSUE DATE" means the date of first issuance of the Notes under the
Indenture.

    "LIEN" means, with respect to any asset, any mortgage, lien, pledge, charge,
security interest or encumbrance of any kind in respect of such asset, whether
or not filed, recorded or otherwise perfected under applicable law (including
any conditional sale or other title retention agreement, any lease in the nature
thereof, any option or other agreement to sell or give a security interest in,
and any filing of or agreement to give any financing statement under the Uniform
Commercial Code (or equivalent statutes) of any jurisdiction).

    "MANAGEMENT ADVANCES" means loans or advances made to directors, officers or
employees of the Company or any Restricted Subsidiary (i) in respect of travel,
entertainment or moving-related expenses incurred in the ordinary course of
business, (ii) in respect of moving-related expenses incurred in connection with
any closing or consolidation of any facility, or (iii) otherwise in the ordinary
course of business not exceeding $3.0 million in the aggregate at any time
outstanding.

    "MANAGEMENT AGREEMENT" means the Metromedia Management Agreement as the same
may be amended, supplemented, modified, restated or replaced from time to time
with the approval of a majority of the disinterested members of the Board of
Directors.

    "NET CASH PROCEEDS" means the aggregate amount of cash or Cash Equivalents
received by the Company in the case of a sale, or Capital Contribution in
respect, of Capital Stock and by the Company

                                     S-100
<PAGE>
and its Restricted Subsidiaries in respect of an Asset Sale plus, in the case of
an issuance of Capital Stock upon any exercise, exchange or conversion of
securities (including options, warrants, rights and convertible or exchangeable
debt) of the Company that were issued for cash on or after the Issue Date, the
amount of cash originally received by the Company upon the issuance of such
securities (including options, warrants, rights and convertible or exchangeable
debt) less, in each case, the sum of all payments, fees, commissions and
reasonable and customary expenses (including, without limitation, the fees and
expenses of legal counsel and investment banking fees and expenses) incurred in
connection with such Asset Sale or sale of Capital Stock, and, in the case of an
Asset Sale only, less the amount (estimated reasonably and in good faith by the
Company) of income, franchise, sales and other applicable federal, state,
provincial, foreign and local taxes required to be paid or accrued as a
liability by the Company or any of its respective Restricted Subsidiaries in
connection with such Asset Sale in the taxable year that such sale is
consummated or in the immediately succeeding taxable year, the computation of
which shall take into account the reduction in tax liability resulting from any
available operating losses and net operating loss carryovers, tax credits and
tax credit carryforwards, and similar tax attributes.

    "NET INCOME" means, with respect to any Person, the net income (loss) of
such Person, determined in accordance with GAAP and before any reduction in
respect of preferred stock dividends, excluding, however, (i) any gain (but not
loss), together with any related provision for taxes on such gain (but not
loss), realized in connection with (a) any Asset Sale or (b) the disposition of
any securities by such Person or any of its Restricted Subsidiaries or the
extinguishment of any Indebtedness of such Person or any of its Restricted
Subsidiaries and (ii) any extraordinary gain or loss, together with any related
provision for taxes on such extraordinary gain or loss.

    "NON-RECOURSE DEBT" means Indebtedness (i) as to which neither the Company
nor an Restricted Subsidiary (a) provides any Guarantee or credit support of any
kind (including any undertaking, guarantee, indemnity, agreement or instrument
that would constitute Indebtedness) or (b) is directly or indirectly liable (as
a guarantor or otherwise) and (ii) no default with respect to which (including
any rights that the holders thereof may have to take enforcement action against
an Unrestricted Subsidiary) would permit (upon notice, lapse of time or both)
any holder of any other Indebtedness of the Company or any Restricted Subsidiary
to declare a default under such other Indebtedness or cause the payment thereof
to be accelerated or payable prior to its Stated Maturity.

    "OFFICER" means the President, the Chief Executive Officer, any Executive
Vice President, and the Chief Financial Officer of the Company.

    "OFFICERS' CERTIFICATE" means a certificate signed by two Officers.

    "PARI PASSU INDEBTEDNESS" means Indebtedness of the Company ranking equal in
right of payment with the Notes.

    "PERMITTED HOLDER" means Metromedia Company, its general partners and their
respective Related Persons and Persons that would constitute a Class B Permitted
Holder as defined in the Company's Amended and Restated Certificate of
Incorporation.

    "PERMITTED INVESTMENTS" means (a) any Investment in the Company or in a
Consolidated Subsidiary of the Company that is engaged entirely or substantially
entirely in a Telecommunications Business; (b) any Investment in Cash
Equivalents; and (c) any Investment by the Company or any of its Restricted
Subsidiaries in a Person, if as a result of such Investment (i) such Person
becomes a Consolidated Subsidiary of the Company that is engaged entirely or
substantially entirely in a Telecommunications Business or (ii) such Person is
merged, consolidated or amalgamated with or into, or transfers or conveys
substantially all of its assets to, or is liquidated into, the Company or a
Consolidated Subsidiary of the Company that is engaged entirely or substantially
entirely in a Telecommunications Business.

    "PERMITTED LIENS" means (i) Liens to secure Indebtedness permitted by
clauses (e), (f), (g) and (h) of the second paragraph of the covenant described
above under the caption "--Incurrence of Indebtedness

                                     S-101
<PAGE>
and Issuance of Preferred Stock", PROVIDED that with respect to Liens to secure
Indebtedness permitted by clause (f) thereof or any Permitted Refinancing
Indebtedness of such Indebtedness, such Lien must cover only the assets acquired
with such Indebtedness; (ii) Liens in favor of the Company or any Restricted
Subsidiary; (iii) Liens on property of a Person existing at the time such Person
is merged with or into or consolidated with the Company or any of its Restricted
Subsidiaries, PROVIDED that such Liens were in existence prior to the
contemplation of such merger or consolidation and do not extend to any assets
other than those of the Person merged into or consolidated with the Company or
such Restricted Subsidiary; (iv) Liens on property existing at the time of
acquisition thereof by the Company or any of its Restricted Subsidiaries,
PROVIDED that such Liens were in existence prior to the contemplation of such
acquisition; (v) Liens to secure the performance of statutory obligations,
surety or appeal bonds, performance bonds or other obligations of a like nature
incurred in the ordinary course of business; (vi) Liens existing on the Issue
Date; (vii) Liens for taxes, assessments or governmental charges or claims that
are not yet delinquent or that are being contested in good faith by appropriate
proceedings promptly instituted and diligently concluded, PROVIDED that any
reserve or other appropriate provision as shall be required in conformity with
GAAP shall have been made therefor; (viii) zoning restrictions, rights-of-way,
easements and similar charges or encumbrances incurred in the ordinary course
which in the aggregate do not detract from the value of the property thereof,
and (ix) Liens incurred in the ordinary course of business of the Company or any
of its Restricted Subsidiaries with respect to obligations that do not exceed
$5.0 million at any one time outstanding and that (a) are not incurred in
connection with the borrowing of money or the obtaining of advances or credit
(other than trade credit in the ordinary course of business) and (b) do not in
the aggregate materially detract from the value of the property or materially
impair the use thereof in the operation of business by the Company or such
Restricted Subsidiary.

    "PERMITTED REFINANCING INDEBTEDNESS" means any Indebtedness of the Company
or any of its Restricted Subsidiaries issued in exchange for, or the net
proceeds of which are used to extend, refinance, renew, replace, defease or
refund other Indebtedness of the Company or any of its Restricted Subsidiaries
(other than intercompany Indebtedness); PROVIDED that: (i) the principal amount
(or accreted value, if applicable) of such Permitted Refinancing Indebtedness
does not exceed the principal amount of (or accreted value, if applicable), plus
accrued interest on, the Indebtedness so extended, refinanced, renewed,
replaced, defeased or refunded (plus the amount of any premium required to be
paid in connection with such refinancing pursuant to the terms of such
Indebtedness or otherwise reasonably determined by the Company to be necessary
and reasonable expenses incurred in connection therewith); (ii) such Permitted
Refinancing Indebtedness has a final maturity date later than the final maturity
date of, and has a Weighted Average Life to Maturity equal to or greater than
the Weighted Average Life to Maturity of, the Indebtedness being extended,
refinanced, renewed, replaced, defeased or refunded; (iii) if the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded is
subordinated in right of payment to the Notes, such Permitted Refinancing
Indebtedness has a final maturity date later than the final maturity date of,
and is expressly subordinated in right of payment to, the Notes on terms at
least as favorable to the Holders of the Notes as those contained in the
documentation governing the Indebtedness being extended, refinanced, renewed,
replaced, defeased or refunded; (iv) such Indebtedness is incurred solely by the
Company or the Restricted Subsidiary who is the obligor on the Indebtedness
being extended, refinanced, renewed, replaced, defeased or refunded; and
(v) such Indebtedness is secured only by the assets, if any, that secured the
Indebtedness being extended, refinanced, renewed, replaced, defeased or
refunded.

    "PERSON" means any individual, corporation, partnership, joint venture,
limited liability company, incorporated or unincorporated association,
joint-stock company, trust, unincorporated organization or government or other
agency or political subdivision thereof or other entity of any kind.

    "PREFERRED STOCK" means any Equity Interest of any class or classes of a
Person (however designated) which is preferred as to payments of dividends, or
as to distributions upon any liquidation or dissolution, over Equity Interests
of any other class of such Person.

                                     S-102
<PAGE>
    "PUBLIC EQUITY OFFERING" means an underwritten offering of common stock of
the Company for cash pursuant to an effective registration statement under the
Securities Act.

    "PURCHASE MONEY INDEBTEDNESS" means Indebtedness (including Acquired Debt,
in the case of leases, Capital Lease Obligations, mortgage financings and
purchase money obligations) incurred for the purpose of financing all or any
part of the cost of the engineering, construction, installation, acquisition,
lease (other than pursuant to a sale and leaseback of Existing Assets),
development or improvement of any Telecommunications Assets used by the Company
or any Restricted Subsidiary, in the case of Indebtedness incurred by the
Company, or any Foreign Subsidiary, in the case of Indebtedness incurred by any
Foreign Subsidiary, including any related notes, Guarantees, collateral
documents, instruments and agreements executed in connection therewith, as the
same may be amended, supplemented, modified or restated from time to time.

    "RELATED PERSON" means any Person who controls, is controlled by or is under
common control with a Permitted Holder; PROVIDED, that for purposes of this
definition "control" means the beneficial ownership of more than 50% of the
total voting power of a Person normally entitled to vote in the election of
directors, managers or trustees, as applicable, of a Person.

    "RESTRICTED INVESTMENT" means any Investment other than a Permitted
Investment.

    "RESTRICTED SUBSIDIARY" of a Person means any Subsidiary of the referent
Person that is not an Unrestricted Subsidiary. Unless the context specifically
requires otherwise, Restricted Subsidiary means a direct or indirect Restricted
Subsidiary of the Company.

    "SIGNIFICANT SUBSIDIARY" means any Restricted Subsidiary that would be a
"significant subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X,
promulgated pursuant to the Act, as such Regulation is in effect on the date
hereof.

    "STATED MATURITY" means, with respect to any installment of interest or
principal on any series of Indebtedness, the date on which such payment of
interest or principal was scheduled to be paid in the original documentation
governing such Indebtedness, and shall not include any contingent obligations to
repay, redeem or repurchase any such interest or principal prior to the date
originally scheduled for the payment thereof.

    "SUBORDINATED INDEBTEDNESS" means Indebtedness of the Company that is
subordinated in right of payment by its terms or the terms of any document or
instrument or instrument relating thereto to the Notes, in any respect.

    "SUBSIDIARY" means, with respect to any Person, (i) any corporation,
association or other business entity of which more than 50% of the total voting
power of shares of Capital Stock entitled (without regard to the occurrence of
any contingency) to vote in the election of directors, managers or trustees
thereof is at the time owned or controlled, directly or indirectly, by such
Person or one or more of the other Subsidiaries of that Person (or a combination
thereof) and (ii) any partnership (a) the sole general partner or the managing
general partner of which is such Person or a Subsidiary of such Person or
(b) the only general partners of which are such Person or of one or more
Subsidiaries of such Person (or any combination thereof).

    "TELECOMMUNICATIONS ASSETS" means all assets, rights (contractual or
otherwise) and properties, whether tangible or intangible, used or intended for
use in connection with a Telecommunications Business and the Equity Interests of
a Person engaged entirely or substantially entirely in a Telecommunications
Business.

    "TELECOMMUNICATIONS BUSINESS" means the business of (i) transmitting, or
providing services relating to the transmission of, voice, video or data through
owned or leased transmission facilities, (ii) constructing, creating, developing
or marketing communications related network equipment, software and other
devices for use in a telecommunications business or (iii) evaluating,
participating or pursuing any other activity or

                                     S-103
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opportunity that is primarily related to those identified in (i) or (ii) above;
PROVIDED, THAT, the determination of what constitutes a Telecommunications
Business shall be made in good faith by the Board of Directors of the Company.

    "UNRESTRICTED SUBSIDIARY" means (i) any Subsidiary of the Company that is
designated by the Board of Directors as an Unrestricted Subsidiary pursuant to a
Board Resolution; but only to the extent that such Subsidiary at the time of
such designation: (a) has no Indebtedness other than Non-Recourse Debt; (b) is a
Person with respect to which neither the Company nor any of its Restricted
Subsidiaries has any direct or indirect obligation to maintain or preserve such
Person's financial condition or to cause such Person to achieve any specified
levels of operating results; and (c) has not Guaranteed or otherwise directly or
indirectly provided credit support for any Indebtedness of the Company or any of
its Restricted Subsidiaries. Any such designation by the Board of Directors
shall be evidenced by filing with the Trustee a certified copy of the Board
Resolution giving effect to such designation and an Officers' Certificate
certifying that such designation complied with the foregoing conditions and was
permitted by the covenant described above under the caption "--Certain
Covenants--Restricted Payments." The Board of Directors of the Company may at
any time designate any Unrestricted Subsidiary to be a Restricted Subsidiary;
provided that such designation shall be deemed to be an incurrence of
Indebtedness by a Restricted Subsidiary of the Company of any outstanding
Indebtedness of such Unrestricted Subsidiary and such designation shall only be
permitted if (i) such Indebtedness is permitted under the covenant described
under the caption "--Certain Covenants--Incurrence of Indebtedness and Issuance
of Preferred Stock," calculated on a pro forma basis as if such designation had
occurred at the beginning of the applicable reference period, and (ii) no
Default or Event of Default would be in existence following such designation.

    "VOTING STOCK" of any Person as of any date means the Capital Stock of such
Person that is at the time entitled to vote in the election of the Board of
Directors of such Person.

    "WEIGHTED AVERAGE LIFE TO MATURITY" means, when applied to any Indebtedness
at any date, the number of years obtained by dividing (i) the sum of the
products obtained by multiplying (a) the amount of each then remaining
installment, sinking fund, serial maturity or other required payments of
principal, including payment at final maturity, in respect thereof, by (b) the
number of years (calculated to the nearest one-twelfth) that will elapse between
such date and the making of such payment, by (ii) the then outstanding principal
amount of such Indebtedness.

    "WHOLLY OWNED RESTRICTED SUBSIDIARY" of any Person means a Restricted
Subsidiary of such Person all of the outstanding Capital Stock or other
ownership interests of which (other than directors' qualifying shares) shall at
the time be owned by such Person or by one or more Wholly Owned Restricted
Subsidiaries of such Person and one or more Wholly Owned Restricted Subsidiaries
of such Person.

BOOK-ENTRY, DELIVERY AND FORM

    DENOMINATION

    Except as set forth below, the Notes will be issued in registered, global
form in minimum denominations of $1,000 or [EURO]1,000, as applicable, and
integral multiples of $1,000 or [EURO]1,000, as applicable, in excess thereof.
The Notes will be issued at the closing of the offering only against payment in
immediately available funds.

                                     S-104
<PAGE>
    FORM

    The Dollar Notes will be represented by one or more Global Notes in
definitive, fully registered form without interest coupons (the "Dollar Global
Notes") and will be deposited with or on behalf of The Depository Trust Company
("DTC") and registered in the name of a nominee of DTC.

    The Euro Notes will be represented by one or more Global Notes in
definitive, fully registered form without interest coupons (the "Euro Global
Notes" and, together with the Dollar Global Notes, the "Global Notes") and will
be deposited with a common depositary for Morgan Guarantee Trust Company of New
York as operator of the Euroclear System ("Euroclear") and Cedelbank (the
"Common Depositary") and registered in the name of a nominee of the Common
Depositary.

    TRANSFER PROCEDURE

    Except in the limited circumstances described below, owners of beneficial
interests in Global Notes will not be entitled to receive physical delivery of
certificated notes. Transfers of beneficial interests in the Global Notes will
be subject to the applicable rules and procedures of DTC, Euroclear and
Cedelbank and their respective direct or indirect participants which rules and
procedures may change from time to time.

    BOOK-ENTRY PROCEDURES

    GLOBAL NOTES.  The following description of the operations and procedures of
DTC, Euroclear and Cedelbank are provided solely as a matter of convenience.
These operations and procedures are solely within the control of the respective
settlement systems and are subject to changes by them from time to time. We take
no responsibility for these operations and procedures and we urge investors to
contact the system or their participants directly to discuss these matters.

    DOLLAR GLOBAL NOTES.  Upon the issuance of the Dollar Global Notes, DTC will
credit, on its internal system, the respective principal amount of the
individual beneficial interests represented by such Global Notes to the accounts
of persons who have accounts with such depositary. Such accounts initially will
be designated by or on behalf of the Underwriters. Ownership of beneficial
interests in a Dollar Global Note will be limited to participants or persons who
hold interests through its participants. Ownership of beneficial interests in
the Dollar Global Notes will be shown on, and the transfer of that ownership
will be effected only through, records maintained by DTC or its nominee (with
respect to interests of participants) and the records of participants (with
respect to interests of persons other than participants).

    EURO GLOBAL NOTES.  Upon the issuance of the Euro Global Notes, the Common
Depositary will credit, on its internal system, the respective principal amount
of the beneficial interests represented by such Global Notes to the accounts of
Euroclear and Cedelbank. Euroclear and Cedelbank will credit, on their internal
systems, the respective principal amounts of the individual beneficial interests
in such Global Notes to the accounts of persons who have accounts with Euroclear
and Cedelbank.

    Such accounts initially will be designated by or on behalf of the
Underwriters. Ownership of beneficial interests in a Euro Global Note will be
limited to participants or persons who hold interests through participants in
Euroclear or Cedelbank. Ownership of beneficial interests in the Euro Global
Notes will be shown on, and the transfer of that ownership will be effected only
through, records maintained by Euroclear and Cedelbank or their respective
nominees (with respect to interests of participants) and the records of
participants (with respect to interests of persons other than participants).

    AS LONG AS DTC OR THE COMMON DEPOSITARY, OR ITS RESPECTIVE NOMINEE, IS THE
REGISTERED HOLDER OF A GLOBAL NOTE, DTC OR THE COMMON DEPOSITARY OR SUCH
NOMINEE, AS THE CASE MAY BE, WILL BE CONSIDERED THE SOLE OWNER AND HOLDER OF THE
NOTES REPRESENTED BY SUCH GLOBAL NOTE FOR ALL PURPOSES UNDER THE INDENTURE AND
THE NOTES.

    Unless:

    (1) in the case of a Dollar Global Note DTC notifies us that it is unwilling
       or unable to continue as depositary for a Global Note or ceases to be a
       "Clearing Agency" registered under the Exchange Act;

                                     S-105
<PAGE>
    (2) in the case of a Euro Global Note, Euroclear and Cedelbank notify us
       that they are unwilling or unable to continue as clearing agency;

    (3) in the case of a Euro Global Note, the Common Depositary notifies us
       that they are unwilling or unable to continue as Common Depositary and a
       successor Common Depositary is not appointed within 120 days of such
       notice; or

    (4) in the case of any Note, an event of default has occurred and is
       continuing with respect to such Note,

owners of beneficial interests in a Global Note will not be entitled to have any
portions of such Global Note registered in their names, will not receive or be
entitled to receive physical delivery of Notes in certificated form and will not
be considered the owners or holders of the Global Note (or any Notes represented
thereby) under the Indenture or the Notes. In addition, no beneficial owner of
an interest in a Global Note will be able to transfer that interest except in
accordance with DTC's and/or Euroclear's and Cedelbank's applicable procedures
(in addition to those under the Indenture referred to herein).

    Investors may hold their interests in the Euro Global Notes through
Cedelbank or Euroclear, if they are participants in such systems, or indirectly
through organizations which are participants in such systems. Cedelbank and
Euroclear will hold interests in the Euro Global Notes on behalf of their
participants through customers' securities accounts in their respective names on
the books of the Common Depositary. Investors may hold their interests in the
Dollar Global Notes directly through DTC, if they are participants in such
system, or indirectly through organizations (including Euroclear and Cedelbank)
which are participants in such system. All interests in a Global Note may be
subject to the procedures and requirements of DTC and/or Euroclear and
Cedelbank.

    PAYMENTS ON THE NOTES

    Payments of the principal of and interest on Dollar Global Notes will be
made to DTC or its nominee as the registered owner thereof. Payments of the
principal of and interest on Euro Global Notes will be made to the order of the
Common Depositary or its nominee as the registered owner thereof. Neither we,
the Trustee, the Common Depositary nor any of their respective agents will have
any responsibility or liability for any aspect of the records relating to or
payments made on account of beneficial ownership interests in the Global Notes
or for maintaining, supervising or reviewing any records relating to such
beneficial ownership interests.

    We expect that DTC or its nominee, upon receipt of any payment of principal
or interest in respect of a Global Note representing any Notes held by it or its
nominee, will immediately credit participants' accounts with payments in amounts
proportionate to their respective beneficial interests in the principal amount
of such Global Note for such Notes as shown on the records of DTC or its
nominee.

    We expect that the Common Depositary, in its capacity as paying agent, upon
receipt of any payment of principal or interest in respect of a Global Note
representing any Notes held by it or its nominee, will immediately credit the
accounts of Euroclear and Cedelbank which in turn will immediately credit
accounts of participants in Euroclear and Cedelbank with payments in amounts
proportionate to their respective beneficial interests in the principal amount
of such Global Note for such Notes as shown on the records of Euroclear and
Cedelbank.

    We also expect that payments by participants to owners of beneficial
interests in such Global Note held through such participants will be governed by
standing instructions and customary practices, as is now the case with
securities held for the accounts of customers registered in "street name." Such
payments will be the responsibility of such participants.

    Because DTC, Euroclear and Cedelbank can only act on behalf of their
respective participants, who in turn act on behalf of indirect participants and
certain banks, the ability of a holder of a beneficial interest in Global Notes
to pledge such interest to persons or entities that do not participate in the
DTC, Euroclear or Cedelbank systems, or otherwise take actions in respect of
such interest, may be limited by the lack of a definitive certificate for such
interest. The laws of some countries and some U.S. states require that certain

                                     S-106
<PAGE>
persons take physical delivery of securities in certificated form. Consequently,
the ability to transfer beneficial interests in a Global Note to such persons
may be limited. Because DTC, Euroclear and Cedelbank can act only on behalf of
participants, which, in turn, act on behalf of indirect participants and certain
banks, the ability of a person having a beneficial interest in a Global Note to
pledge such interest to persons or entities that do not participate in the DTC
system or in Euroclear and Cedelbank, as the case may be, or otherwise take
actions in respect of such interest, may be affected by the lack of a physical
certificate evidencing such interest.

    Except for trades involving only Euroclear and Cedelbank participants,
interests in the Dollar Global Notes will trade in DTC's Same-Day Funds
Settlement System and secondary market trading activity in such interests will
therefore settle in immediately available funds, subject in all cases to the
rules and procedures of DTC and its participants. Transfers of interests in
Dollar Global Notes between participants in DTC will be effected in accordance
with DTC's procedures, and will be settled in same-day funds. Transfers of
interests in Euro Global Notes and Dollar Global Notes between participants in
Euroclear and Cedelbank will be effected in the ordinary way in accordance with
their respective rules and operating procedures.

    Cross-market transfers of dollar notes between DTC participants, on the one
hand, and Euroclear or Cedelbank participants, on the other hand, will be
effected in DTC in accordance with DTC's rules on behalf of Euroclear or
Cedelbank, as the case may be, by its respective depositary; however, such
cross-market transactions will require delivery of instructions to Euroclear or
Cedelbank, as the case may be, by the counterparty in such system in accordance
with the rules and procedures and within the established deadlines (Brussels
time) of such system. Euroclear or Cedelbank, as the case may be, will, if the
transaction meets its settlement requirements, deliver instructions to its
respective depositary to take action to effect final settlement on its behalf by
delivering or receiving interests in the relevant Global Notes in DTC, and
making or receiving payments in accordance with normal procedures for same-day
funds settlement applicable to DTC. Euroclear participants and Cedelbank
participants may not deliver instructions directly to the depositories for
Euroclear or Cedelbank.

    Because of time zone differences, the securities account of a Euroclear or
Cedelbank participant purchasing an interest in a Dollar Global Note from a DTC
participant will be credited, and any such crediting will be reported to the
relevant Euroclear or Cedelbank participant, during the securities settlement
processing day (which must be a business day for Euroclear and Cedelbank
immediately following the DTC settlement date). Cash received in Euroclear or
Cedelbank as a result of sales of interests in a Global Note by or through a
Euroclear or Cedelbank participant to a DTC participant will be received with
value on the DTC settlement date but will be available in the relevant Euroclear
or Cedelbank cash account only as of the business day for Euroclear or Cedelbank
following the DTC settlement date.

    DTC, Euroclear and Cedelbank have advised us that they will take any action
permitted to be taken by a holder of Notes (including the presentation of Notes
for exchange as described below) only at the direction of one or more
participants to whose account with DTC or Euroclear or Cedelbank, as the case
may be, interests in the Global Notes are credited and only in respect of such
portion of the aggregate principal amount of the Notes as to which such
participant or participants has or have given such direction. However, if there
is an event of default under the Notes, DTC, Euroclear and Cedelbank reserve the
right to exchange the Global Notes for Notes in certificated form, and to
distribute such Notes to their respective participants.

    If the Notes are issued in certificated form, holders of such certificated
Notes will be able to receive payments of principal and interest on their Notes
in accordance with the procedures described under "--Certificated Notes."

    DEPOSITARY PROCEDURES

    DTC.  DTC has advised us as follows: DTC is a limited purpose trust company
organized under the laws of the State of New York, a member of the Federal
Reserve System, a "clearing corporation" within

                                     S-107
<PAGE>
the meaning of the Uniform Commercial Code and a "Clearing Agency" registered
pursuant to the provisions of Section 17A of the Exchange Act. DTC was created
to hold securities for its participants and facilitate the clearance and
settlement of securities transactions between participants through electronic
book-entry changes in accounts of its participants, thereby eliminating the need
for physical transfer and delivery of certificates. Participants include
securities brokers and dealers, banks, trust companies and clearing corporations
and may include certain other organizations. Indirect access to the DTC system
is available to other entities such as banks, brokers, dealers and trust
companies that clear through or maintain a custodial relationship with a
participant, either directly or indirectly ("indirect participants").

    EUROCLEAR AND CEDELBANK.  Euroclear and Cedelbank have advised us as
follows: Euroclear and Cedelbank each hold securities for their account holders
and facilitate the clearance and settlement of securities transactions by
electronic book-entry transfer between their respective account holders, thereby
eliminating the need for physical movements of certificates and any risk from
lack of simultaneous transfers of securities.

    Euroclear and Cedelbank each provide various services including safekeeping,
administration, clearance and settlement of internationally traded securities
and securities lending and borrowing. Euroclear and Cedelbank each also deal
with domestic securities markets in several countries through established
depository and custodial relationships. The respective systems of Euroclear and
Cedelbank have established an electronic bridge between their two systems across
which their respective account holders may settle trades with each other.

    Account holders in both Euroclear and Cedelbank are world-wide financial
institutions including underwriters, securities brokers and dealers, trust
companies and clearing corporations. Indirect access to both Euroclear and
Cedelbank is available to other institutions that clear through or maintain a
custodial relationship with an account holder of either system.

    An account holder's overall contractual relations with either Euroclear or
Cedelbank are governed by the respective rules and operating procedures of
Euroclear or Cedelbank and any applicable laws. Both Euroclear and Cedelbank act
under such rules and operating procedures only on behalf of their respective
account holders, and have no record of or relationship with persons holding
through their respective account holders.

    Although DTC, Euroclear and Cedelbank currently follow the foregoing
procedures to facilitate transfers of interests in Global Notes among
participants of DTC, Euroclear and Cedelbank, they are under no obligation to do
so, and such procedures may be discontinued or modified at any time. Neither we
nor the Trustee will have any responsibility for the performance by DTC,
Euroclear or Cedelbank or their respective participants or indirect participants
of their respective obligations under the rules and procedures governing their
operations.

    CERTIFICATED NOTES

    If any depositary is at any time unwilling or unable to continue as a
depositary for the Notes for the reasons set forth above under "Book Entry
Procedures," we will issue certificates for such Notes in definitive, fully
registered, non-global form without interest coupons in exchange for the Global
Notes. Certificates for Notes delivered in exchange for any Global Note or
beneficial interests therein will be registered in the names, and issued in any
approved denominations, requested by DTC, Euroclear, Cedelbank or the Common
Depositary (in accordance with their customary procedures).

    In the event definitive Notes are issued, the holders of definitive Notes
will be able to receive payments of principal and interest on their Notes at the
office of the Company's paying agent maintained in the Borough of Manhattan,
and, if the definitive Notes are listed on the Luxembourg Stock Exchange, at the
offices of the paying agent in Luxembourg. All payments of interest may be
received at the offices of a paying agent upon presentation of certificated
Notes and all payments of principal may be received at such offices upon
surrender of the Notes. The Company also has the option of mailing checks to the
registered holders of the Notes.

                                     S-108
<PAGE>
    The Company's paying agent with respect to the Dollar Notes in the Borough
of Manhattan is currently the corporate trust office of The Bank of New York,
located at 101 Barclay Street, Floor 21 West, New York, New York. The Company's
paying agent with respect to the Euro Notes in London, United Kingdom is
currently the corporate trust office of The Bank of New York, London Branch, at
1 Canada Square, London E14 5AL, United Kingdom. The Company's paying agent and
transfer agent in Luxembourg is Kredietbank S.A. Luxembourgeoise, currently
located at 43 boulevard Royal, L-2955 Luxembourg. As long as the Notes are
listed on the Luxembourg Stock Exchange, the Company will maintain a paying
agent and transfer agent in Luxembourg. Any change in the Luxembourg paying
agent and transfer agent will be published in Luxembourg. See "--Notices."

    In the event definitive Notes are issued, the holders of definitive Notes
will be able to transfer their Notes, in whole or in part, by surrendering the
Notes for registration of transfer at the office of The Bank of New York and, so
long as definitive Notes are listed on the Luxembourg Stock Exchange, at the
offices of the paying agent in Luxembourg, duly endorsed by or accompanied by a
written instrument of transfer in form satisfactory to the Company and the
securities registrar. Upon surrender, the Company will execute, and the trustee
will authenticate and deliver new Notes to the designated transferee in the
amount being transferred, and a new Note for any amount not being transferred
will be issued to the transferor. The Company will not charge any fee for the
registration of transfer or exchange, except that the Company may require the
payment of a sum sufficient to cover any applicable tax or other governmental
charge payable in connection with the transfer. Notwithstanding any statement
herein, we and the Trustees reserve the right to impose such transfer,
certification, exchange or other requirements, if any, as they may determine are
necessary to ensure compliance with applicable laws or as DTC, Euroclear or
Cedelbank may require.

    SAME-DAY SETTLEMENT AND PAYMENT

    The Indenture will require that payment in respect of the Notes represented
by the Global Notes, including principal, and premium, if any, be made by wire
transfer of immediately available funds to the accounts specified by the Global
Note holder. With respect to Notes in certificated form, we will make all
payments of principal, and premium, if any, by wire transfer of immediately
available funds to the accounts specified by the holders thereof or, if no such
account is specified, by mailing a check to each such holder's registered
address. The Notes represented by the Global Notes will be eligible to trade in
DTC's Same-Day Firm Settlement System, and any permitted secondary market
trading activity in such Notes will, therefore, be required by DTC to be settled
in immediately available funds.

    Because of time zone differences, the securities account of a Euroclear or
Cedelbank participant purchasing an interest in a Global Note from a participant
in DTC will be credited, and any such crediting will be reported to the relevant
Euroclear or Cedelbank participant, during the securities settlement processing
day (which must be a business day for Euroclear and Cedelbank) immediately
following the settlement date of DTC. Cash received in Euroclear or Cedelbank as
a result of sales of interests in a Global Note by or through a Euroclear or
Cedelbank participant to a participant in DTC will be received with value on the
settlement date of DTC but will be available in the relevant Euroclear or
Cedelbank cash account only as of the business day for Euroclear or Cedelbank
following DTC's settlement date.

NOTICES

    Notices to holders of the Notes will be made by first class mail, postage
prepaid, to the addresses that appear on the register of the Company. So long as
the Notes are listed on the Luxembourg Stock Exchange, notices to non-United
States residents will be made by publication in authorized newspapers in
Luxembourg. It is expected that publication will be made in Luxembourg in the
LUXEMBURGER WORT. Any notice will be deemed to have been given on the date of
publication or, if published more than once, on the date of the first
publication.

                                     S-109
<PAGE>
            CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS

    The following discussion is a summary of certain United States federal
income tax considerations that may be relevant to the purchase, ownership and
disposition of the notes. This summary does not purport to be a complete
analysis of all of the potential United States federal income tax considerations
relating to the purchase, ownership and disposition of the notes and generally
does not address any other taxes that might be applicable to a holder of the
notes. We cannot assure you that the United States Internal Revenue Service (the
"IRS") will take a similar view of such consequences. Further, the discussion
does not address all aspects of taxation that may be relevant to particular
purchasers in light of their individual circumstances (including the effect of
any foreign, state or local laws) or to certain types of purchasers subject to
special treatment under United States federal income tax laws (including dealers
in securities, insurance companies, financial institutions, persons that hold
notes that are a hedge or that are hedged against currency risks or that are
part of a straddle or conversion transaction or a constructive sale, persons
whose functional currency is not the U.S. dollar and tax-exempt entities). The
discussion below assumes that the notes are held as capital assets within the
meaning of section 1221 of the Internal Revenue Code of 1986, as amended (the
"Code").

    The discussion of the United States federal income tax considerations below
is based on currently existing provisions of the Code, the applicable Treasury
regulations promulgated and proposed thereunder (the "Treasury Regulations"),
judicial decisions, and administrative interpretations, all of which are subject
to change, possibly on a retroactive basis. Because individual circumstances may
differ, as a prospective purchaser of the notes, you are strongly urged to
consult your tax advisor with respect to your particular tax situation and the
particular tax effects of any state, local, non-United States or other tax laws
and possible changes in the tax laws.

    As used in this section, the term "U.S. Holder" means a beneficial owner of
a note who or which is for United States federal income tax purposes (i) an
individual who is a citizen or resident of the United States, (ii) a
corporation, partnership or other entity created or organized in or under the
laws of the United States or of any political subdivision thereof, (iii) an
estate the income of which is subject to United States federal income taxation
regardless of its source, (iv) a trust if a court within the United States is
able to exercise primary supervision over the administration of the trust and
one or more United States persons have the authority to control all substantial
decisions of the trust, or (v) otherwise subject to United States federal income
tax on a net income basis in respect of the notes. The term also includes
certain former citizens of the United States whose income and gain on the notes
will be subject to United States taxation. As used herein, the term "Non-U.S.
Holder" means a beneficial owner of a note that is not a U.S. Holder.

TAX CONSIDERATIONS FOR U.S. HOLDERS

    PAYMENTS OF INTEREST

    Interest on a note generally will be taxable to a U.S. Holder as ordinary
interest income at the time it accrues or is received in accordance with the
U.S. Holder's method of accounting for United States federal income tax
purposes.

    FOREIGN CURRENCY ASPECTS OF INTEREST.  The amount of interest required to be
included in income by a cash-basis U.S. Holder upon receipt of a payment on a
Euro note will be the U.S. dollar value of the Euro amount paid (determined
using the "spot rate" on the date such payment is received), regardless of
whether the payment is in fact converted into U.S. dollars. A spot rate is a
rate that is demonstrated to reflect a fair market rate of exchange available to
the public for currency under a spot contract in a free market and involving
representative amounts. The tax basis of Euros received by a U.S. Holder
generally will equal the U.S. dollar value of such Euros (as described) when
paid. Upon any subsequent exchange of such Euros for U.S. dollars or for another
foreign currency, or upon the use of such Euros to purchase

                                     S-110
<PAGE>
property, a U.S. Holder will generally recognize exchange gain or loss equal to
the difference between the U.S. Holder's tax basis for the Euros and the amount
of U.S. dollars received (or, where another foreign currency is received, the
U.S. dollar value of such foreign currency based on the U.S. dollar spot rate on
the date of the exchange) or, if property is purchased, the U.S. dollar value of
the Euros exchanged for such property based on the U.S. dollar spot rate on the
date of the exchange. Generally, no exchange gain or loss should be realized if
a U.S. Holder receives Euros and exchanges such Euros for U.S. dollars on the
same day.

    Except in the case of a Spot Rate Convention Election (as defined below),
interest (including OID) on a Euro note held by a U.S. Holder that is required
to accrue interest on a note prior to receipt of such interest will be
determined for any accrual period in Euros and then translated into U.S. dollars
using the average exchange rate for the accrual period or, with respect to an
accrual period that spans two taxable years, using the average rate for the
partial period within each taxable year. The average rate of exchange for an
interest accrual period is the simple average of the exchange rates for each
business day of such period (or such other average that is reasonably derived
and consistently applied by the holder).

    Applicable Treasury Regulations allow accrual basis taxpayers to elect (a
"Spot Rate Convention Election") to translate interest income at the spot rate
on the last day of the interest accrual period (and in the case of a partial
accrual period, the spot rate on the last day of the taxable year). In addition,
a holder may elect to use the spot rate in effect on the date of receipt (or
payment) for such purpose if such date is within five business days of the last
date of an interest accrual period. A holder that makes such an election must
apply it consistently to all debt instruments from year to year and may not
revoke the election without the consent of the IRS.

    Upon receipt of an interest payment on a Euro note, an accrual basis U.S.
Holder will recognize ordinary gain or loss with respect to accrued interest
income in an amount equal to the difference between the U.S. dollar value of the
payment received (determined using the spot rate in effect on the date such
payment is received) in respect of such interest accrual period and the U.S.
dollar value of the interest income that has accrued during such interest
accrual period (as determined above)). Any such gain or loss will be treated as
ordinary income or loss but generally will not be treated as interest income or
expense, except to the extent provided by future regulations or administrative
pronouncements of the IRS.

    For purposes of computing exchange gain and loss, payments received on a
Euro note shall be treated first as payments of interest, and second as payments
of principal.

    MARKET DISCOUNT AND BOND PREMIUM

    If a U.S. Holder purchases a note for an amount that is less than its
principal amount, the difference generally will be treated as "market discount".
In such case, any partial principal payment on and gain realized on the sale,
exchange or retirement of the note and unrealized appreciation on certain
nontaxable dispositions of the note will be treated as ordinary income to the
extent of the market discount that has not previously been included in income
and that is treated as having accrued on the note prior to such payment or
disposition and the U.S. Holder might be required to defer all or a portion of
the interest expense on any indebtedness incurred or continued to purchase or
carry such note (in each case, unless the U.S. Holder has made an election to
include such market discount in income as it accrues). Unless the U.S. Holder
elects to treat market discount as accruing on a constant yield method, market
discount will be treated as accruing on a straight-line basis over the remaining
term of the note. An election made to include market discount in income as it
accrues will apply to all debt instruments acquired by the U.S. Holder on or
after the first day of the taxable year to which such election applies and may
be revoked only with the consent of the IRS. In the case of Euro notes, market
discount will be determined in Euros. If the U.S. Holder elects to include
market discount in income as it accrues, the amount included for any accrual
period will be translated into U.S. dollars at the average exchange rate for
that period. If the U.S. Holder

                                     S-111
<PAGE>
has not elected to include market discount in income as it accrues, the amount
of the discount will be translated into U.S. dollars at the spot rate on the
date the Euro note is disposed of.

    If a U.S. Holder purchases a note for an amount in excess of all amounts
payable on the note after the purchase date, other than payments of stated
interest, such excess will be treated as "bond premium." In general, a U.S.
Holder may elect to amortize bond premium over the remaining term of the note on
a constant yield method. The amount of bond premium allocable to any accrual
period is offset against the stated interest allocable to such accrual period
(and any excess may be deducted, subject to certain limitations). An election to
amortize bond premium applies to all taxable debt instruments held at the
beginning of the first taxable year to which such election applies and
thereafter acquired by the U.S. Holder and may be revoked only with the consent
of the IRS. In the case of Euro notes, bond premium will be determined in Euros
and will offset stated interest in Euros. A U.S. Holder will recognize exchange
gain or loss with respect to any such bond premium on a Euro note, calculated by
treating the portion of the premium amortized with respect to any period as if
it were a return of principal.

    SALE, EXCHANGE OR RETIREMENT OF NOTES

    Upon the sale, exchange or retirement of a note, a U.S. Holder will
recognize taxable gain or loss equal to the difference between the amount of
cash plus the fair market value of any property received (not including any
amount attributable to accrued but unpaid interest) and such holder's adjusted
tax basis in the note. A U.S. Holder's adjusted tax basis in a note will be its
cost, increased by any accrued market discount included in income and reduced by
any amortized bond premium and any principal payment on the note received by
such holder.

    Subject to the discussions of market discount and foreign currency gain or
loss, gain or loss realized on the sale, exchange or retirement of a note by a
U.S. Holder generally will be capital gain or loss if the note is held as a
capital asset by the U.S. Holder. Net capital gains of individuals are subject
to tax at lower rates than items of ordinary income. The deductibility of
capital losses is subject to limitations.

    In general, a U.S. Holder will realize exchange gain or loss with respect to
payments of principal on a Euro note, determined by translating the
Euro-denominated principal amount paid at the spot rate on the date of payment
and subtracting from that the Euro-denominated principal amount at the spot rate
on the date the U.S. Holder acquired the Euro note. Any such exchange gain or
loss will be treated as ordinary income or loss.

TAX CONSIDERATIONS FOR NON-U.S. HOLDERS

    Generally, payments of principal or interest on the notes by the Company or
any paying agent to a beneficial owner of a note that is a Non-U.S. Holder will
not be subject to U.S. federal income or income withholding tax, provided that,
in the case of interest, (i) such Non-U.S. Holder does not own, actually or
constructively, 10% or more of the combined voting power of all classes of stock
of the Company entitled to vote, (ii) such Non-U.S. Holder is not, for U.S.
federal income tax purposes, a controlled foreign corporation related to the
Company actually or constructively through stock ownership, (iii) such Non-U.S.
Holder is not a bank receiving interest described in section 881(c)(3)(A) of the
Code and (iv) either (a) the Non-U.S. Holder provides the Company or its agent
with an IRS Form W-8 (or a suitable substitute form) signed under penalties of
perjury that includes its name and address and certifies as to its non-United
States status in compliance with applicable law and Treasury Regulations or
(b) a securities clearing organization, bank or other financial institution that
holds customers' securities in the ordinary course of its trade or business
holds the note and provides a statement to the Company or its agent signed under
penalties of perjury in which such organization, bank or financial institution
certifies that such a Form W-8 (or a suitable substitute form) has been received
by it from the Non-U.S. Holder or from another financial institution acting on
behalf of the Non-U.S. Holder and furnishes the Company or its agent with a copy

                                     S-112
<PAGE>
thereof. If these requirements cannot be met, a Non-U.S. Holder generally will
be subject to United States federal income withholding tax at a rate of 30% (or
such lower rate provided by an applicable treaty) with respect to payments of
interest on the notes. The Non-U.S. Holder must inform the Company or its agent
or the financial institution to which the Non-U.S. Holder provided the Form W-8
(or suitable substitute) within 30 days of any change in the information
provided in such form.

    Treasury Regulations generally effective for payments made after
December 31, 2000 (the "New Regulations") provide alternative methods for
satisfying the certification requirements described in clause (iv) above. The
New Regulations also will require, in the case of notes held by a foreign
partnership, that (i) the certification be provided by the partners rather than
by the foreign partnership and (ii) the partnership provide certain information,
including a U.S. taxpayer identification number.

    A Non-U.S. Holder of a note generally will not be subject to United States
federal income or income withholding tax on gain realized on the sale, exchange,
redemption, retirement or other disposition of such Note, unless (i) such
Non-U.S. Holder is an individual who is present in the United States for 183
days or more in the taxable year of the disposition, and certain other
conditions are met or (ii) such gain is effectively connected with the conduct
by such Non-U.S. Holder of a trade or business in the United States.

    Notwithstanding the above, if a Non-U.S. Holder of a note is engaged in a
trade or business in the United States and if interest on the note, or gain
realized on the disposition of the note, is effectively connected with the
conduct of such trade or business, the Non-U.S. Holder generally will be subject
to regular United States federal income tax on such interest or gain in the same
manner as if it were a U.S. Holder, unless an applicable treaty provides
otherwise. In addition, if such Non-U.S. Holder is a foreign corporation, it may
be subject to a branch profits tax equal to 30% (or such lower rate provided by
an applicable treaty) of its effectively connected earnings and profits for the
taxable year, subject to certain adjustments. Even though such effectively
connected income is subject to income tax, and may be subject to the branch
profits tax, it generally is not subject to income withholding if the Non-U.S.
Holder delivers a properly executed IRS Form 4224 (or other form applicable
under the New Regulations) to the payor.

TAX CONSIDERATIONS APPLICABLE TO BOTH U.S. HOLDERS AND NON-U.S. HOLDERS

    BACKUP WITHHOLDING AND INFORMATION REPORTING

    Under current United States federal income tax law, a 31% backup withholding
tax might apply to certain payments on, and the proceeds from a sale, exchange
or redemption of, the notes, unless the holder of the note (i) is a corporation
or comes within certain other exempt categories and, when required, demonstrates
that fact or (ii) provides a correct taxpayer identification number, certifies
as to its exemption from backup withholding and otherwise complies with
applicable requirements of the backup withholding rules.

    Backup withholding and information reporting generally will not apply to
payments made by the Company or a paying agent on a note to a Non-U.S. Holder if
the certification described under "Tax Considerations for Non-U.S. Holders" is
duly provided or the Non-U.S. Holder otherwise establishes an exemption and the
payor does not have actual knowledge that the holder is a U.S. Holder or that
the conditions of any other exemption are not, in fact, satisfied. The payments
of proceeds from the disposition of a note to or through a non-United States
office of a broker that is (i) a United States person, (ii) a controlled foreign
corporation for United States federal income tax purposes, (iii) a foreign
person, 50% or more of whose gross income from all sources for certain periods
is from activities effectively connected with the conduct of a United States
trade or business or (iv) after December 31, 2000, a foreign partnership if
either (A) more than 50% of the income or capital interest is owned by U.S.
Holders or (B) such partnership has certain connections to the United States,
will be subject to information reporting

                                     S-113
<PAGE>
requirements unless such broker has documentary evidence in its files of the
holder's Non-U.S. Holder status and has no actual knowledge to the contrary or
otherwise establishes an exemption. Before January 1, 2001, backup withholding
will not apply to any payment of the proceeds from the sale of a note made to or
through a foreign office of a "broker" (as defined in applicable Treasury
Regulations). However, after December 31, 2000, backup withholding might apply
if the broker has actual knowledge that the payee is a U.S. Holder. Payments of
the proceeds from the sale of a note to or through the United States office of a
broker are subject to information reporting and possible backup withholding
unless the holder certifies, under penalties of perjury, that it is not a U.S.
Holder and that certain other conditions are met or otherwise establishes an
exemption, provided that the broker does not have actual knowledge that the
holder is a U.S. Holder or that the conditions of any other exemption are not,
in fact, satisfied.

    Holders of notes should consult their tax advisors regarding the application
of backup withholding in their particular situations, the availability of an
exemption therefrom, and the procedure for obtaining such an exemption, if
available. Any amounts withheld from payment under the backup withholding rules
will be allowed as a credit against the holder's United States federal income
tax liability and may entitle the holder to a refund if the required information
is furnished to the IRS.

    THE FOREGOING DISCUSSION IS FOR GENERAL INFORMATION ONLY AND IS NOT TAX
ADVICE. ACCORDINGLY, AS A PROSPECTIVE HOLDER OF A NOTE, YOU SHOULD CONSULT YOUR
TAX ADVISOR AS TO THE PARTICULAR TAX CONSEQUENCES TO YOU OF PURCHASING, HOLDING
AND DISPOSING OF THE NOTES, INCLUDING THE APPLICABILITY AND EFFECT OF ANY STATE,
LOCAL, OR NON-UNITED STATES TAX LAWS AND ANY RECENT OR PROSPECTIVE CHANGES IN
APPLICABLE TAX LAWS AND THE EFFECT OF THE NEW REGULATIONS WITH RESPECT TO
PAYMENTS MADE AFTER DECEMBER 31, 2000.

                                     S-114
<PAGE>
                                  UNDERWRITING

    Subject to the terms and conditions set forth in the underwriting agreement
dated November 12, 1999, each underwriter named below has severally agreed to
purchase from us, and we have agreed to sell to such underwriter, the principal
amount of notes set forth opposite the name of such underwriter.

<TABLE>
<CAPTION>
                                                              PRINCIPAL AMOUNT   PRINCIPAL AMOUNT
UNDERWRITER                                                   OF DOLLAR NOTES     OF EURO NOTES
- -----------                                                   ----------------   ----------------
<S>                                                           <C>                <C>

Salomon Smith Barney Inc....................................    $375,000,000     [EURO]125,000,000
Chase Securities Inc........................................      93,750,000         31,250,000
Deutsche Bank Securities Inc................................      75,000,000         25,000,000
Donaldson, Lufkin & Jenrette Securities Corporation.........      93,750,000         31,250,000
Goldman, Sachs & Co.........................................      75,000,000         25,000,000
Morgan Stanley & Co. Incorporated...........................      37,500,000         12,500,000
                                                                ------------       ------------
    Total...................................................    $750,000,000     [EURO]250,000,000
                                                                ============       ============
</TABLE>

    The underwriting agreement provides that the obligations of the underwriters
to purchase the notes included in this offering are subject to the approval of
legal matters by counsel and to other conditions. The underwriters are obligated
to purchase all of the notes if they purchase any of the notes.

    The underwriters propose to offer some of the notes directly to the public
at the public offering prices set forth on the cover page of this prospectus
supplement and some of the notes to certain dealers at the public offering price
less a concession not in excess of:

    - 0.50% of the principal amount in the case of the Dollar notes; and

    - 0.50% of the principal amount in the case of the Euro notes.

    The underwriters may allow, and such dealers may reallow, a concession to
certain other dealers not in excess of:

    - 0.25% of the principal amount in the case of the Dollar notes; and

    - 0.25% of the principal amount in the case of the Euro notes.

    After the initial offering of the notes to the public, the public offering
prices and the concessions to dealers may be changed by the underwriters.

    The following table shows the underwriting discounts and commissions to be
paid to the underwriters by us in connection with this offering (expressed as a
percentage of the principal amount of the notes).

<TABLE>
<CAPTION>
                                                         PAID BY US
                                                         ----------
<S>                                                      <C>          <C>
Per note...............................................     2.625%
</TABLE>

    The underwriters are offering the notes subject to prior sale and their
acceptance of the notes from us. The underwriters may reject any order in whole
or in part.

    The underwriters may over-allot or effect transactions that stabilize or
cover, each of which is described below.

    - Over-allotment involves syndicate sales of notes in excess of the
      principal amount of notes to be purchased by the underwriters, which
      creates a short position for the underwriters.

    - Stabilizing transactions involve bids or purchases of notes made for the
      purpose of preventing or retarding a decline in the market price of the
      notes while the offering is in progress.

    - Syndicate covering transactions involve purchases of the notes in the open
      market after the distribution has been completed in order to cover
      syndicate short positions.

                                     S-115
<PAGE>
    These transactions may cause the price of the notes to be higher than it
would otherwise be in the absence of such transactions. The underwriters are not
required to engage in any of these activities and may end any of these
activities at any time. The underwriters may also impose a penalty bid. Penalty
bids permit an underwriter to reclaim a selling concession from a syndicate
member when that underwriter, in covering syndicate short positions or making
stabilizing purchases, purchases notes originally sold by that syndicate member.

    We estimate that our total expenses of this offering will be $1,000,000.

    The notes are new issues of securities with no established trading market.
Application has been made to list the notes on the Luxembourg Stock Exchange. We
have been advised by the underwriters that they presently intend to make a
market in the notes, as permitted by applicable laws and regulations. The
underwriters are not obligated, however, to make a market in the notes and may
discontinue any market making at any time at their sole discretion. Accordingly,
we can make no assurance as to the liquidity of, or trading markets for, the
notes.

    Purchasers of the notes may be required to pay stamp taxes and other charges
in accordance with the laws and practices of the country of purchase in addition
to the issue price set forth on the cover page of this document.

    We have agreed with the underwriters not to offer, sell, contract to sell,
grant any other option to purchase or otherwise dispose of, directly or
indirectly, any notes or similar securities, or enter into any agreement to do
any of the foregoing, for a period of 180 days after the date of issuance of the
notes without the prior written consent of Salomon Smith Barney Inc., except for
the convertible subordinated note to be issued to Bell Atlantic.

    We have agreed to indemnify the underwriters against certain liabilities,
including liabilities under the Securities Act, and to contribute to payments in
respect thereto.

    Each underwriter has represented and agreed in the underwriting agreement
that:

    - it has not offered or sold and will not offer or sell, any notes to
      persons in the United Kingdom, except to persons whose ordinary activities
      involve them in acquiring, holding, managing or disposing of investments
      (as principal or agent) for the purposes of their businesses or otherwise
      in circumstances which shall not result in an offer to the public in the
      United Kingdom within the meaning of the Public Offers of Securities
      Regulations 1995;

    - it has complied and will comply with all applicable provisions of the
      Financial Services Act 1986 (the "FSA") with respect to anything done by
      it in relation to the notes in, from or otherwise involving the United
      Kingdom; and

    - it has only issued or passed on and will only issue or pass on in the
      United Kingdom any document received by it in connection with the issue or
      sale of the notes to a person who is of a kind described in Article 11(3)
      of the FSA 1986 (Investment Advertisements) (Exemptions) Order 1996, as
      amended, or is a person to whom the document may otherwise lawfully be
      issued or passed on.

    Certain of the underwriters, their affiliates or predecessors are providing,
have provided and may in the future provide investment banking or other
financial services to us and our affiliates in the ordinary course of business
and will receive customary compensation in connection therewith. Certain of the
underwriters in this offering are acting as underwriters in the sale of class A
common stock by certain of our stockholders and in an offering by DECS
Trust VI, both of which are expected to be completed concurrently with the
offering of the notes and none of which are conditioned on the other. See
"Recent and Proposed Transactions."

                                     S-116
<PAGE>
                          NOTICE TO CANADIAN RESIDENTS

THE OFFERING

    The distribution of notes in Canada is being made on a private placement
basis solely in the Provinces of Quebec, Ontario, Manitoba, Saskatchewan,
Alberta and British Columbia.

RESALE RESTRICTIONS

    Any resale of the notes must be made in accordance with an exemption from
the registration and prospectus requirements of applicable securities laws,
which vary depending on the province. Purchasers of notes are advised to seek
legal advice prior to any resale of the notes.

REPRESENTATION BY PURCHASERS

    Confirmations of the acceptance of offers to purchase the notes will be sent
to purchasers in Canada who have not withdrawn their offers to purchase prior to
the issuance of such confirmations. Each purchaser who receives a purchase
confirmation will, by the purchaser's receipt thereof, be deemed to represent to
us and the dealer from whom such purchase confirmation is received that such
purchaser is entitled under applicable provincial securities laws to purchase
the notes without the benefit of a prospectus qualified under such securities
laws.

CANADIAN FEDERAL INCOME TAX CONSIDERATIONS

    The following summary fairly describes the principal Canadian federal tax
considerations generally applicable to a person who acquires notes pursuant to
this offering memorandum and who, at all relevant times and for purposes of the
INCOME TAX ACT (Canada) and any applicable tax treaty or convention, is or is
deemed to be resident in Canada, deals at arm's length with us and holds the
notes as capital property. Generally, the notes will constitute capital property
to a holder of notes provided that the holder of notes does not hold the notes
in the course of carrying on a business and does not acquire them as part of an
adventure in the nature of trade. Certain holders of notes who might not
otherwise be considered to hold their notes as capital property may, in certain
circumstances, be entitled to have them treated as capital property by making
the one time election permitted by subsection 39(4) of the INCOME TAX ACT
(Canada). This summary is not applicable to a holder of notes that is a
"financial institution" as defined in the INCOME TAX ACT (Canada) for purposes
of certain rules applicable to any income, gain or loss arising from a
"mark-to-market property". Holders of notes that are "financial institutions"
for the purposes of these rules should consult their own tax advisors.

    This summary is based upon the current provisions of the INCOME TAX ACT
(Canada) and the regulations thereunder, all specific proposals to amend the
INCOME TAX ACT (Canada) and regulations publicly announced by or on behalf of
the Minister of Finance (Canada) prior to the date hereof and counsel's
understanding of the current published administrative and assessing policies and
practices of Revenue Canada, Customs, Excise and Taxation. This summary is not
exhaustive of all possible Canadian federal income tax considerations and,
except for the proposed amendments described above, does not take into account
or anticipate any changes in the law or administrative practice, whether by
judicial, governmental or legislative decision or action, nor does it take into
account tax legislation or considerations of any province, territory or foreign
jurisdiction, which may differ significantly from those discussed herein.

    This summary is of a general nature only and is not intended to be and
should not be construed to be, legal or tax advice to any particular holder of
notes, and no representations with respect to the income tax consequences to any
particular holder of notes are made. ACCORDINGLY, PROSPECTIVE PURCHASERS OF
NOTES SHOULD CONSULT THEIR OWN TAX ADVISORS FOR ADVICE WITH RESPECT TO THE TAX
CONSEQUENCES TO THEM OF ACQUIRING, HOLDING AND DISPOSING OF NOTES.

    For the purposes of the INCOME TAX ACT (Canada), all amounts relating to the
acquisition, holding or disposition of notes, including interest, adjusted cost
base and proceeds of disposition, must be converted

                                     S-117
<PAGE>
into Canadian dollars based on the prevailing United States dollar or Euro
exchange rate, as the case may be, at the time such amounts arise.

    INTEREST

    A holder of notes that is a corporation, partnership, unit trust or a trust
of which a corporation or partnership is a beneficiary will be required to
include in computing its income for a taxation year all interest that accrues to
such holder on the notes to the end of that year or that becomes receivable or
is received by it before the end of that year, to the extent that such interest
was not included in computing the holder's income for a preceding taxation year.
Any other holder of notes, including an individual, will be required to include
in computing its income for a taxation year all interest on the notes that is
received or receivable by such holder of notes in that year (depending on the
method regularly followed by the holder of notes in computing income) to the
extent that such interest was not included in computing the holder's income for
a preceding taxation year.

    Any premium paid by us because of the exercise of the right to redeem the
notes before the maturity thereof will be deemed to be interest received at that
time by a holder to the extent that such premium can reasonably be considered to
relate to, and does not exceed the value at the time of redemption of, the
interest that would have been paid or payable by us on those notes for a
taxation year ending after the redemption.

    DISPOSITION

    On a disposition or a deemed disposition (which will include a redemption or
repayment at maturity) of a note, a holder of notes will generally be required
to include in computing its income for the taxation year in which the
disposition occurs all interest that accrued on the note from the date of the
last interest payment to the date of disposition except to the extent that such
interest has otherwise been included in the holder's income for that year or a
preceding taxation year. In general, a disposition or a deemed disposition of a
note will result in a capital gain (or a capital loss) equal to the amount by
which the proceeds of disposition, net of any amount included in the holder's
income as interest and any reasonable costs of disposition, exceed (or are
exceeded by) the adjusted cost base of the note to the holder immediately before
the disposition.

    Generally, three-quarters of any capital gain (a "taxable capital gain")
realized by a holder of notes in a taxation year must be included in computing
such holder's income for that taxation year, and three-quarters of any capital
loss (an "allowable capital loss") realized by a holder of notes in a taxation
year may be deducted from any taxable capital gains realized by the holder in
the year. Allowable capital losses in excess of taxable capital gains may be
carried back and deducted in any of the three preceding taxation years or
carried forward and deducted in any following taxation year against taxable
capital gains realized in such years, subject to and in accordance with the
provisions of the INCOME TAX ACT (Canada).

    REFUNDABLE TAX

    A holder of notes that is a "Canadian-controlled private corporation" (as
defined in the INCOME TAX ACT (Canada)) may be liable for a refundable tax of
6 2/3% on investment income, including interest and taxable capital gains earned
or realized in respect of the notes.

    FOREIGN TAX CREDIT

    Subject to certain limitations, a holder may be entitled to claim a credit
or a deduction in computing such holder's Canadian tax liability for any United
States withholding or other income tax payable by the holder in respect of
interest received on, or any gain realized on a disposition of, the notes.

    FOREIGN PROPERTY

    The notes will be "foreign property" for the purpose of the tax imposed on
certain deferred income plans under Part XI of the INCOME TAX ACT (Canada).

                                     S-118
<PAGE>
ENFORCEMENT OF LEGAL RIGHTS

  ONTARIO

    The notes being offered are those of a foreign issuer and Ontario purchasers
will not receive the contractual right of action prescribed by section 32 of the
Regulation under the SECURITIES ACT (Ontario). As a result, Ontario purchasers
must rely on other remedies that may be available, including common law rights
of action for damages or rescission or rights of action under the civil
liability provisions of the U.S. federal securities laws.

    All of our directors and officers, and the experts named herein may be
located outside Canada and, as a result, it may not be possible for Canadian
purchasers to effect service of process within Canada upon Metromedia or such
persons. All or a substantial portion of our assets and such persons may be
located outside of Canada and, as a result, it may not be possible to satisfy a
judgment against us or such persons in Canada or to enforce a judgment obtained
in Canadian courts against us or such persons outside of Canada.

  SASKATCHEWAN

    THE SECURITIES ACT, 1988 (Saskatchewan) provides purchasers with certain
statutory rights of action, including: (a) if the prospectus or any amendment
thereto contains a misrepresentation, which was a misrepresentation at the time
of purchase (i) a right of action for damages or rescission against us, (ii) a
right of action for damages against every promoter and director of ours who was
a promoter or director at the time the prospectus or any amendment thereto was
sent or delivered, and (iii) a right of action for damages against the dealer
from whom the notes were purchased; (b) a right of action for damages against
any individual who makes a verbal misrepresentation to such Saskatchewan
purchaser prior to or contemporaneously with the purchase of the notes; (c) a
right to void the agreement to purchase the notes and recover the purchase price
if the notes are sold in contravention of the Act, the regulations under the Act
or a decision of the Saskatchewan Securities Commission; and (d) a right of
action for damages or rescission if a copy of this notice, the attached
prospectus or any amendment thereto was not delivered to such purchaser before
the notes were subscribed for.

    An action for damages must be started by the earlier of (a) one year after
the investor first had knowledge of the facts giving rise to the action or
(b) six years after the date of the transaction that gave rise to the action. An
action for rescission must be commenced by 180 days after the date of the
transaction that gave rise to the action.

    The rights available to Saskatchewan purchasers are in addition to and
without derogation from any other right or remedy which such purchasers may have
at law, are intended to correspond to the provisions of the Act and are subject
to the defences contained therein.

  ALBERTA

    Securities legislation in Alberta provides that every purchaser of
securities pursuant to this offering memorandum shall have, in addition to any
other rights they may have at law, a right of action for damages or recession,
or both, against the issuer on whose behalf the distribution is made if the
offering memorandum or any amendment thereto contains a misrepresentation.
However such rights must be exercised within prescribed time limits. Purchasers
should refer to the applicable provisions of the Alberta securities legislation
for particulars of these rights or consult with a lawyer.

    The SECURITIES ACT (Alberta) provides that no action may be commenced to
enforce such right of action unless the right is exercised: (a) in the case of
an action for rescission, 180 days from the day of the transaction that gave
rise to the cause of action; or (b) in the case of any action, other than an
action for rescission, the earlier of: (i) 180 days from the day that the
purchaser first had knowledge of the facts giving rise to the cause of action;
or (ii) one year from the day of the transaction that gave rise to the cause of
action.

                                     S-119
<PAGE>
                             VALIDITY OF THE NOTES

    Paul, Weiss, Rifkind, Wharton & Garrison, New York, New York, will pass upon
certain legal matters for us in connection with the offering of the notes.
Skadden, Arps, Slate, Meagher & Flom LLP, Los Angeles, California, will pass
upon certain legal matters for the underwriters in connection with the offering
of the notes. Skadden, Arps, Slate, Meagher & Flom LLP has represented us on
other unrelated matters.

                                    EXPERTS

    The consolidated financial statements of Metromedia Fiber Network, Inc. at
December 31, 1997 and 1998 and for each of the years in the three-year period
ended December 31, 1998, appearing in this prospectus supplement, have been
audited by Ernst & Young LLP, independent auditors, as set forth in their report
thereon appearing elsewhere in this prospectus supplement and are included in
reliance upon such report given on the authority of such firm as experts in
accounting and auditing.

    AboveNet's financial statements as of June 30, 1998 and 1999 and for each of
the three years in the period ended June 30, 1999 included and incorporated by
reference in this prospectus supplement have been audited by Deloitte & Touche
LLP, independent auditors, as stated in their report, which is included and
incorporated by reference herein, and have been so included and incorporated in
reliance upon the report of such firm given upon their authority as experts in
accounting and auditing.

    The Combined Statement of Assets to be Acquired and Liabilities to be
Assumed of Palo Alto Internet Exchange as of December 26, 1998 and December 27,
1997 and the related Combined Statement of Revenues and Direct Expenses for the
period June 12, 1998 through December 26, 1998, the period December 28, 1997
through June 12, 1998 and the fiscal years ended December 27, 1997 and
December 29, 1996 appearing in this prospectus supplement, have been included in
reliance on the reports of PricewaterhouseCoopers LLP, independent accountants,
given on the authority of said firm as experts in auditing and accounts.

                      WHERE YOU CAN FIND MORE INFORMATION

    We are currently subject to the periodic reporting and other informational
requirements of the Exchange Act. The reports and other information that we
filed with the Securities and Exchange Commission can be inspected and copied at
prescribed rates at the public reference facilities maintained by the Securities
and Exchange Commission at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W.,
Washington, D.C. 20549, and will also be available for inspection and copying at
the regional offices of the Securities and Exchange Commission located at 7
World Trade Center, Suite 1300, New York, New York 10048 and the Citicorp Center
at 500 West Madison Street, Suite 1400, Chicago, Illinois 60661-2511. You may
obtain information on the operation of the public reference facilities by
calling the Securities and Exchange Commission at 1-800-SEC-0330. The Securities
and Exchange Commission also maintains an Internet Web Site at
http://www.sec.gov that contains reports, proxy and information statements and
other information. As long as the Notes are listed on the Luxembourg Stock
Exchange, the Company will maintain copies of such materials at the specified
office of the paying agent in Luxembourg where they will be made available upon
request. You can also obtain copies of such materials from us upon request. We
have agreed that, whether or not we are required to do so by the rules and
regulations of the Securities and Exchange Commission, for so long as any of the
notes remain outstanding, we will furnish you as a holder of the notes and will,
if permitted, file with the Securities and Exchange Commission (i) all quarterly
and annual financial information that would be required to be contained in a
filing with the Securities and Exchange Commission on Forms 10-Q and 10-K if we
were required to file such forms, including a "Management's Discussion and
Analysis of Financial Condition and Results of Operations" and, with respect to
the annual information only, a report thereon by our certified independent
accountants, and (ii) all reports that would be required to be filed with the
Securities and Exchange Commission on Form 8-K if we were required to file such
reports.

                                     S-120
<PAGE>
               INCORPORATION OF INFORMATION WE FILE WITH THE SEC

    The following documents and other materials, which have been filed by us
with the Securities and Exchange Commission, are incorporated herein and
specifically made a part of this prospectus supplement by this reference:

    - our Annual Report on Form 10-K for the fiscal year ended December 31,
      1998;

    - our Quarterly Report on Form 10-Q for the three months ended March 31,
      1999;

    - our Quarterly Report on Form 10-Q for the six months ended June 30, 1999;

    - our Quarterly Report on Form 10-Q for the nine months ended September 30,
      1999;

    - our Current Report on Form 8-K dated June 30, 1999;

    - our Current Report on Form 8-K dated September 10, 1999, as amended by our
      Current Report on Form 8-K/A dated October 14, 1999 as further amended by
      our Current Report on Form 8-K/A dated October 26, 1999;

    - the "Risk Factors--Risk Factors Applicable to AboveNet" and "Business of
      AboveNet" sections contained in our Registration Statement on Form S-4
      dated August 5, 1999 (File No. 333-84541); and

    - our Current Report on Form 8-K filed on October 18, 1999.

    So long as the notes are listed on the Luxembourg Stock Exchange, the above
referenced documents and materials will be available at the offices of paying
agent in Luxembourg.

    In addition, all documents filed with the Securities and Exchange Commission
pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act
of 1934 by us subsequent to the date of this prospectus supplement shall be
deemed to be incorporated by reference into this prospectus supplement and to be
a part hereof from the date of filing of such documents with the Securities and
Exchange Commission. Any statement contained in this prospectus supplement or in
a document incorporated or deemed to be incorporated by reference in this
prospectus supplement shall be deemed to be modified or superseded for purposes
of this prospectus supplement to the extent that a statement contained in this
prospectus supplement or in any other subsequently filed document which also is
or is deemed to be incorporated by reference herein modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this prospectus
supplement.

    Statements contained in this prospectus supplement or in any document
incorporated by reference in this prospectus supplement as to the contents of
any contract or other document referred to herein or therein are not necessarily
complete, and in each instance, reference is made to the copy of such contract
or other document filed as an exhibit to the documents incorporated by
reference, each such statement being qualified in all respects by such
reference.

    This prospectus supplement incorporates documents by reference that are not
presented herein or delivered herewith. Copies of such documents, other than
exhibits to such documents that are not specifically incorporated by reference
herein, are available without charge to any person to whom this prospectus
supplement is delivered, upon written or oral request to: Metromedia Fiber
Network, Inc., c/o Metromedia Company, One Meadowlands Plaza, East Rutherford,
NJ 07073; Attention: General Counsel; tel: (201) 531-8000. So long as the notes
are listed on the Luxembourg Stock Exchange, copies of the documents
incorporated by reference in this prospectus supplement will be made available
at the specified office of the paying agent in Luxembourg.

                                     S-121
<PAGE>
                              GENERAL INFORMATION

LISTING

    In connection with the application for the notes to be listed on the
Luxembourg Stock Exchange, a notice relating to the issue of the notes and a
copy of the charter of our company have been filed with the Chief Registrar of
the District Court of Luxembourg (GREFFLER EN CHEF DU TRIBUNAL D'ARRONDISSEMENT
DE ET A LUXEMBOURG) where such documents are available for inspection and where
copies of such documents will be obtainable upon request.

CLEARING SYSTEMS

    The notes have been accepted for clearance by Cedelbank, SOCIETE anonyme and
by Morgan Guaranty Trust Company of New York, Brussels office as operator of the
Euroclear System. The Common Code and the International Security Identification
Number (ISIN) for the Dollar notes are 010441226 and US591689AE42, respectively.
The Common Code and the ISIN for the Euro notes are 010441323 and XS0104413231,
respectively.

AUTHORIZATION

    The issue of the notes was authorized by our Board of Directors on
November 10, 1999.

DOCUMENTS

    Copies of our charter and by-laws will be available for inspection so long
as any notes are outstanding at the specified office of the paying agent in
Luxembourg.

    Copies of our latest annual report and quarterly interim financial
statements will be available at the specified office of the paying agent in
Luxembourg, so long as any notes are outstanding.

    Copies of the indenture and all agreements in connection with the issuance
of the senior notes will be available at the specified office of the Paying
Agent in Luxembourg, so long as any notes are outstanding.

MATERIAL ADVERSE CHANGE

    Except as disclosed in this prospectus supplement, the accompanying
prospectus and the documents incorporated by reference, there has been no
material adverse change in our financial position since December 31, 1998.

LITIGATION

    Except as disclosed in this prospectus supplement, the accompanying
prospectus and the documents incorporated by reference, we are not involved in
any litigation or arbitration proceedings relating to claims or amounts which
are material in the context of the issue of the notes nor, so far as we are
aware, is any such litigation or arbitration pending or threatened.

FINANCIAL STATEMENTS

    We only publish consolidated financial statements and do not publish
non-consolidated financial statements. This prospectus supplement includes
financial statements of AboveNet and Palo Alto Internet Exchange for the last
reporting periods prior to their respective acquisition. AboveNet and Palo Alto
Internet Exchange are currently included in our consolidated financial
statements, and the separate financial statements of these companies are no
longer published or required.

                                     S-122
<PAGE>
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
METROMEDIA FIBER NETWORK, INC. AND SUBSIDIARIES:

Report of Independent Auditors..............................   F-2

Consolidated Balance Sheets as of December 31, 1998 and
  1997......................................................   F-3

Consolidated Statements of Operations for the years ended
December 31, 1998, 1997 and 1996............................   F-4

Consolidated Statements of Cash Flows for the years ended
December 31, 1998, 1997 and 1996............................   F-5

Consolidated Statements of Changes in Stockholders' Equity
(Deficiency) for the years ended December 31, 1998, 1997 and
1996........................................................   F-6

Notes to Consolidated Financial Statements..................   F-7

Consolidated Statements of Operations for the nine months
ended
September 30, 1998 and 1999 (unaudited).....................  F-24

Consolidated Balance Sheet as of September 30, 1999
  (unaudited)...............................................  F-25

Consolidated Statements of Cash Flows for the nine months
ended
September 30, 1998 and 1999 (unaudited).....................  F-26

Notes to Consolidated Financial Statements..................  F-27

ABOVENET COMMUNICATIONS INC.:

Independent Auditors' Report................................  F-37

Consolidated Balance Sheets as of June 30, 1998 and 1999....  F-38

Consolidated Statements of Operations for the Years Ended
  June 30, 1997, 1998 and 1999..............................  F-39

Consolidated Statements of Stockholders' Equity for the
  Years Ended
  June 30, 1997, 1998 and 1999..............................  F-40

Consolidated Statements of Cash Flows for the Years Ended
  June 30, 1997, 1998 and 1999..............................  F-41

Notes to Consolidated Financial Statements..................  F-42

PALO ALTO INTERNET EXCHANGE:

Independent Accountants' Reports............................  F-58

Combined Statements of Assets to be Acquired and Liabilities
  to be Assumed as of March 27, 1999 (unaudited), December
  26, 1998 and December 27, 1997............................  F-60

Combined Statement of Revenues and Direct Expenses for the
  Quarters Ended March 27, 1999 and March 26, 1998
  (unaudited), period from June 12, 1998 through December
  26, 1998, period from December 28, 1997 through June 11,
  1998 and the Fiscal Years Ended December 27, 1997 and
  December 29, 1996.........................................  F-61

Notes to Combined Statements of Assets to be Acquired and
  Liabilities to be Assumed and Combined Statements of
  Revenues and Direct Expenses..............................  F-62
</TABLE>

                                      F-1
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS

To the Board of Directors and Shareholders of
  Metromedia Fiber Network, Inc.

    We have audited the accompanying consolidated balance sheets of Metromedia
Fiber Network, Inc. and Subsidiaries (the "Company") as of December 31, 1998 and
1997, and the related consolidated statements of operations, stockholders'
equity and cash flows for each of the three years in the period ended December
31, 1998. Our audits also included the financial statement schedule listed in
the index at Item 14(a). These consolidated financial statements and schedule
are the responsibility of the Company's management. Our responsibility is to
express an opinion on these consolidated financial statements and schedule based
on our audits.

    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

    In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the consolidated financial position of
Metromedia Fiber Network, Inc. and Subsidiaries as of December 31, 1998 and
1997, and the consolidated results of their operations and their cash flows for
each of the three years in the period ended December 31, 1998 in conformity with
generally accepted accounting principles. Also, in our opinion, the related
financial statement schedule, when considered in relation to the basic financial
statements taken as a whole, presents fairly in all material respects the
information set forth therein.

<TABLE>
<S>                                                    <C>  <C>
                                                                      /s/ ERNST & YOUNG LLP
</TABLE>

New York, New York
March 4, 1999, except for paragraph 16 of note 2,
as to which the date is May 19, 1999

                                      F-2
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

                          CONSOLIDATED BALANCE SHEETS

                        (IN 000'S, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              -------------------
                                                                1998       1997
                                                              --------   --------
<S>                                                           <C>        <C>
                           ASSETS
Current assets:
  Cash and cash equivalents.................................  $569,319   $138,846
  Pledged securities, current portion.......................    61,384         --
  Accounts receivable.......................................    30,910        837
Prepaid expenses and other current assets...................     4,210        874
                                                              --------   --------
      Total current assets..................................   665,823    140,557
Fiber optic transmission network and related equipment,
  net.......................................................   244,276     24,934
Property and equipment, net.................................     2,716        759
Pledged securities..........................................    30,512         --
Investment in/advance to joint venture......................     4,156         56
Other assets................................................    26,934      1,072
                                                              --------   --------
      Total assets..........................................  $974,417   $167,378
                                                              ========   ========
            LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable..........................................  $  6,106   $  3,072
  Accrued liabilities.......................................    96,512      3,271
  Deferred revenue, current portion.........................     8,100      1,184
  Capital lease obligations, current portion................        55         --
                                                              --------   --------
      Total current liabilities.............................   110,773      7,527
Senior notes payable........................................   650,000         --
Capital lease obligations...................................    22,675         --
Deferred revenue............................................    33,455     10,311
Commitments and contingencies (see notes)
Stockholders' equity:
  Class A common stock, $.01 par value; 360,000,000 shares
    authorized; 155,210,220 and 149,793,136 shares issued
    and outstanding, respectively...........................     1,552      1,498
  Class B common stock, $.01 par value; 40,000,000 shares
    authorized; 33,769,272 shares issued and outstanding....       338        338
  Additional paid-in capital................................   197,861    190,927
  Accumulated deficit.......................................   (42,237)   (43,223)
                                                              --------   --------
      Total stockholders' equity............................   157,514    149,540
                                                              --------   --------
      Total liabilities and stockholders' equity............  $974,417   $167,378
                                                              ========   ========
</TABLE>

                             See accompanying notes

                                      F-3
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

                     CONSOLIDATED STATEMENTS OF OPERATIONS

                      (IN 000'S, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                               FOR THE YEAR ENDED DECEMBER 31,
                                                              ---------------------------------
                                                                1998        1997        1996
                                                              ---------   ---------   ---------
<S>                                                           <C>         <C>         <C>
Revenue.....................................................   $36,436    $  2,524    $    236

Expenses:

  Cost of sales.............................................    13,937       3,572         699
  Selling, general and administrative.......................    14,712       6,303       2,070
  Consulting and employment incentives......................       248      19,218       3,652
  Settlement agreement......................................     3,400          --          --
  Depreciation and amortization.............................     1,532         757         613
                                                               -------    --------    --------
Income (loss) from operations...............................     2,607     (27,326)     (6,798)
  Interest income...........................................     8,788       1,808          --
  Interest expense (including financing costs)..............    (6,861)       (741)     (3,561)
  Loss from joint venture...................................      (146)         --          --
                                                               -------    --------    --------
Income (loss) before income taxes...........................     4,388     (26,259)    (10,359)
  Income taxes..............................................     3,402          --          --
                                                               -------    --------    --------
Net income (loss)...........................................   $   986    $(26,259)   $(10,359)
                                                               =======    ========    ========
Net income (loss) per share, basic..........................   $  0.01    $  (0.28)   $  (0.14)
                                                               =======    ========    ========
Net income per share, diluted...............................   $  0.01         N/A         N/A
                                                               =======    ========    ========
Weighted average number of shares outstanding, basic........   186,990      94,894      71,716
                                                               =======    ========    ========
Weighted average number of shares outstanding, diluted......   219,524      N/A         N/A
                                                               =======    ========    ========
</TABLE>

                            See accompanying notes.

                                      F-4
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

                     CONSOLIDATED STATEMENTS OF CASH FLOWS

                                   (IN 000'S)

<TABLE>
<CAPTION>
                                                               FOR THE YEAR ENDED DECEMBER 31,
                                                              ---------------------------------
                                                                1998        1997        1996
                                                              ---------   ---------   ---------
<S>                                                           <C>         <C>         <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)...........................................  $    986    $(26,259)   $(10,359)
Adjustments to reconcile net income (loss) to net cash
  provided by (used in) operating activities:
    Depreciation and amortization...........................     1,532         757         613
    Stock options and warrants issued for services..........       248      19,439       5,395
    Warrants issued for settlement agreement................     3,000          --          --
    Deferred taxes..........................................     2,707
    Reserve for note receivable.............................        --         338          --
    Loss from joint venture.................................       146          --          --
CHANGE IN OPERATING ASSETS AND LIABILITIES:
    Accounts receivable.....................................   (30,073)       (656)          2
    Accounts payable and accrued expenses...................    13,449         (12)        758
    Deferred revenue........................................    30,060      10,387         833
    Other...................................................    (4,070)     (1,806)         12
                                                              --------    --------    --------
Net cash provided by (used in) operating activities.........    17,985       2,188      (2,746)
                                                              --------    --------    --------
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures on fiber optic transmission network and
  related equipment.........................................  (114,849)    (19,206)       (974)
Deposit payments............................................    (4,675)        (87)         --
Investment in / advance to joint venture....................    (4,246)        (56)         --
Purchase of pledged securities..............................   (91,896)         --          --
Capital expenditures on property and equipment..............    (2,305)       (318)        (95)
                                                              --------    --------    --------
  Net cash used in investing activities.....................  (217,971)    (19,667)     (1,069)
                                                              --------    --------    --------
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock......................     1,038     133,975         123
Proceeds from issuance of preferred stock and warrants......        --      32,500       2,025
Dividends paid on preferred stock...........................        --         (77)         --
Repayments of notes payable- private placement..............        --      (1,408)         25
Repayments of notes payable.................................        --      (5,950)     (3,350)
Proceeds from notes payables, net...........................   630,000          --       5,450
Payments of capital lease obligations.......................      (579)         --          --
Purchase of common stock....................................        --      (1,140)         --
Purchase of preferred stock.................................        --      (2,039)         --
                                                              --------    --------    --------
  Net cash provided by financing activities.................   630,459     155,861       4,273
                                                              --------    --------    --------
NET INCREASE IN CASH AND CASH EQUIVALENTS...................   430,473     138,382         458
CASH AND CASH EQUIVALENTS-BEGINNING OF PERIOD...............   138,846         464           6
CASH AND CASH EQUIVALENTS-END OF PERIOD.....................  $569,319    $138,846    $    464
Supplemental information:
    Interest paid...........................................  $    219    $  1,145    $    996
                                                              ========    ========    ========
    Income taxes paid.......................................  $  3,760    $     --    $     --
                                                              ========    ========    ========
Supplemental disclosure of significant non-cash investing
  activities:
    Capital lease obligations...............................  $ 23,309    $     --    $     --
                                                              ========    ========    ========
    Accrued capital expenditures............................  $ 82,916    $     --    $     --
                                                              ========    ========    ========
</TABLE>

                             See accompanying notes

                                      F-5
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES
     CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIENCY)
                           (IN THOUSANDS OF DOLLARS)
<TABLE>
<CAPTION>
                                                                                    COMMON STOCK          COMMON STOCK
                                        SERIES A & B                             -------------------   -------------------
                                       PREFERRED STOCK        COMMON STOCK        CLASS                 CLASS
                                     -------------------   -------------------      A                     B
                                      SHARES     AMOUNT     SHARES     AMOUNT     SHARES     AMOUNT     SHARES     AMOUNT
                                     --------   --------   --------   --------   --------   --------   --------   --------
<S>                                  <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
Balance at December 31, 1995.......      --        --       49,920     $ 499          --     $   --         --      $ --
Issuance of common stock and
  warrants for services rendered...      --        --       21,305       213          --         --         --        --
Issuance of common stock and
  warrants related to debt
  financing activities.............      --        --        6,870        69          --         --         --        --
Issuance of common stock in
  connection with the exercise of
  warrants.........................      --        --        1,525        15          --         --         --        --
Sale of common stock and
  warrants.........................      --        --          392         4          --         --         --        --
Sale of preferred stock with
  warrants.........................     300        30           --        --          --         --         --        --
Net loss for the year..............      --        --           --        --          --         --         --        --
                                       ----       ---      -------     -----     -------     ------     ------      ----
Balance at December 31, 1996.......     300        30       80,012       800          --         --         --        --
Issuance of common stock in
  connection with the exercise of
  warrants.........................      --        --        1,216        12          --         --         --        --
Issuance of options to employees...      --        --           --        --          --         --         --        --
Issuance of warrants in connection
  with debt extension..............      --        --           --        --          --         --         --        --
Dividends on preferred stock.......      --        --           --        --          --         --         --        --
Repurchase and retirement of Series
  A preferred stock and warrants...    (300)      (30)          --        --          --         --         --        --
Repurchase and retirement of common
  stock and warrants...............      --        --       (4,707)      (47)         --         --         --        --
Sale of Series B preferred stock...      16        --           --        --          --         --         --        --
Net proceeds from initial Public
  Offering.........................      --        --           --        --      72,863        729         --        --
Conversion of Common Stock to
  Series A Common Stock............      --        --      (76,521)     (765)     76,520        765         --        --
Conversion of Series B Preferred
  Stock to Series A & B Common
  Stock............................     (16)       --           --        --         314          3     33,769       338
Sale of Series A Common Stock for
  warrant..........................      --        --           --        --          96          1         --        --
Net loss for the year..............      --        --           --        --          --         --         --        --
                                       ----       ---      -------     -----     -------     ------     ------      ----
Balance at December 31, 1997.......      --        --           --        --     149,793      1,498     33,769       338
Issuance of options to employees...      --        --           --        --          --         --         --        --
Issuance of warrants in connection
  with settlement agreement........      --        --           --        --          --         --         --        --
Issuance of common stock in
  connection with the exercise of
  warrants.........................      --        --           --        --       4,317         43         --        --
Issuance of common stock in
  connection with the exercise of
  stock options....................      --        --           --        --       1,100         11         --        --
Net income for the year............      --        --           --        --          --         --         --        --
Income tax benefit from exercises
  of employee stock options........      --        --           --        --          --         --         --        --
                                       ----       ---      -------     -----     -------     ------     ------      ----
Balance at December 31, 1998.......      --        --           --     $  --     155,210     $1,552     33,769      $338
                                       ====       ===      =======     =====     =======     ======     ======      ====

<CAPTION>

                                     ADDITIONAL
                                      PAID-IN     ACCUMULATED
                                      CAPITAL       DEFICIT       TOTAL
                                     ----------   ------------   --------
<S>                                  <C>          <C>            <C>
Balance at December 31, 1995.......   $   (454)     $ (5,381)      (5,336)
Issuance of common stock and
  warrants for services rendered...      4,702            --        4,915
Issuance of common stock and
  warrants related to debt
  financing activities.............      1,703            --        1,772
Issuance of common stock in
  connection with the exercise of
  warrants.........................        (15)           --           --
Sale of common stock and
  warrants.........................        120            --          124
Sale of preferred stock with
  warrants.........................      1,995            --        2,025
Net loss for the year..............         --       (10,359)     (10,359)
                                      --------      --------     --------
Balance at December 31, 1996.......      8,051       (15,740)      (6,859)
Issuance of common stock in
  connection with the exercise of
  warrants.........................         (2)           --           10
Issuance of options to employees...     19,218            --       19,218
Issuance of warrants in connection
  with debt extension..............        220            --          220
Dividends on preferred stock.......         --           (77)         (77)
Repurchase and retirement of Series
  A preferred stock and warrants...     (1,996)          (13)      (2,039)
Repurchase and retirement of common
  stock and warrants...............         42        (1,134)      (1,139)
Sale of Series B preferred stock...     32,500            --       32,500
Net proceeds from initial Public
  Offering.........................    133,150            --      133,879
Conversion of Common Stock to
  Series A Common Stock............         --            --           --
Conversion of Series B Preferred
  Stock to Series A & B Common
  Stock............................       (341)           --           --
Sale of Series A Common Stock for
  warrant..........................         85            --           86
Net loss for the year..............         --       (26,259)     (26,259)
                                      --------      --------     --------
Balance at December 31, 1997.......    190,927       (43,223)     149,540
Issuance of options to employees...        248            --          248
Issuance of warrants in connection
  with settlement agreement........      3,000            --        3,000
Issuance of common stock in
  connection with the exercise of
  warrants.........................        118            --          161
Issuance of common stock in
  connection with the exercise of
  stock options....................        861            --          872
Net income for the year............         --           986          986
Income tax benefit from exercises
  of employee stock options........      2,707            --        2,707
                                      --------      --------     --------
Balance at December 31, 1998.......   $197,861      $(42,237)    $157,514
                                      ========      ========     ========
</TABLE>

                                      F-6
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1: BUSINESS OPERATIONS AND LINE OF BUSINESS

    The Company is a facilities-based provider of a technologically advanced,
high-bandwidth, fiber optic communications infrastructure to communications
carriers and corporate/government customers in the United States. The Company
focuses its operations on domestic intracity fiber optic networks in clusters of
the 15 largest cities, based on population, throughout the United States.

    The Company operates high-bandwidth fiber optic communications networks in
New York and Philadelphia. The Company also is engineering and constructing
networks in Washington, D.C., Chicago, San Francisco and Boston. The Company is
designing networks in Atlanta, Dallas, Houston, Seattle and Los Angeles.

    The Company has also built or obtained intercity fiber optic capacity that
links certain of its intracity networks. The Company has under construction a
250-route mile network from New York to Washington, D.C. The Company has also
obtained rights for fiber optic capacity with other facilities-providers and
obtained fiber optic capacity linking certain of the metropolitan areas (New
York-Chicago, New York-Boston, Chicago-Seattle-Portland) in which it plans to
construct intracity networks, except in Portland.

    In addition, the Company has entered into a joint venture with a United
Kingdom telecommunications company to connect its New York network to London.
The Company has formed a joint venture to construct a high-bandwidth fiber optic
network connecting 13 major cities in Germany and obtain certain additional
fiber optic capacity in Western Europe.

NOTE 2: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION

    The consolidated financial statements include the accounts of the Company
and its subsidiaries. All significant inter-company balances and transactions
have been eliminated in consolidation. The investment in a 50% owned joint
venture with a United Kingdom telecommunications company is accounted for by the
equity method. Certain balances in the consolidated financial statements have
been restated to conform to the current period presentation.

MANAGEMENT ESTIMATES

    The preparation of financial statements, in conformity with generally
accepted accounting principles, requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosures of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting periods. Actual results may differ from those estimates.

FAIR VALUE OF FINANCIAL INSTRUMENTS

    The carrying amounts for cash, accounts receivable, accounts payable and
accrued liabilities approximate their fair value. The fair value of long-term
debt is determined based on quoted market rates or the cash flows from such
financial instruments discounted at the Company's estimated current interest
rate to enter similar financial instruments. At December 31, 1998, the fair
value of the Company's fixed rate long-term debt for the 10% Senior Notes due in
2008, was $650 million. The recorded amounts for all other long-term debt of the
Company approximates fair values.

                                      F-7
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 2: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
CASH AND CASH EQUIVALENTS

    For purposes of the consolidated financial statements, the Company considers
all highly liquid investments with an original maturity of three months or less
when purchased to be cash equivalents.

PLEDGED SECURITIES

    In connection with the sale of 10% Senior Notes (see Note 9), a portion of
the net proceeds was utilized to purchase a portfolio consisting of U.S.
government securities, which mature at dates sufficient to provide for payment
in full of interest on the 10% Senior Notes through May 15, 2000. The pledged
securities are stated at cost, adjusted for premium amortization and accrued
interest. The fair value of the pledged securities approximates the carrying
value.

ACCOUNTS RECEIVABLE

    Accounts receivable includes trade receivables and costs and estimated
earnings in excess of billings for those contracts where the Company utilizes
the percentage of completion method for recognizing revenue.

FIBER OPTIC TRANSMISSION NETWORK AND RELATED EQUIPMENT

    The fiber optic transmission network and related equipment are stated at
cost. Costs in connection with the installation and expansion of the network are
capitalized. Depreciation is computed using the straight-line method through the
life of either the franchise agreement or right of way for the related network.

PROPERTY AND EQUIPMENT

    Property and equipment are stated at cost. Depreciation is computed using
the straight-line method over the estimated useful lives of the assets.

OTHER ASSETS

    Other assets include debt issuance costs, franchise agreements and deposits.
Those costs, which are amortizable, are amortized on a straight-line basis over
a period ranging from ten to fifteen years.

LONG-LIVED ASSETS

    The Company reviews for the impairment of long-lived assets and certain
identifiable intangibles whenever events or changes in circumstances indicate
that the carrying amount of an asset may not be recoverable. The Company has
identified no such impairment indicators.

INCOME TAXES

    In accordance with Statement of Financial Accounting Standards ("SFAS") No.
109, "Accounting for Income Taxes," the Company recognizes deferred income taxes
for the tax consequences in future years of differences between the tax bases of
assets and liabilities and their financial reporting amounts at each year end,
based on enacted tax laws and statutory tax rates applicable to the periods in
which the differences are expected to affect taxable income. Valuation
allowances are established when necessary to reduce deferred

                                      F-8
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 2: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
tax assets to the amount that is "more likely than not" to be realized. The
provision for income taxes is the tax payable for the period and the change,
during the period, in deferred tax assets and liabilities.

RECAPITALIZATIONS

    In April 1997, the Company increased its authorized common stock of $.01 par
value to 60,000,000 shares; in addition, authorized preferred stock with a par
value of $.01 was increased to 2,000,000 shares. On April 29, 1997, the Company
effected a 3-for-one stock split of its outstanding shares of common stock.

    In September 1997, the Company effected a .507-for-one reverse stock split
of its common stock.

    On October 28, 1997, the total authorized number of shares of common stock
of the Company was increased to 200 million shares, par value $0.01 per share,
of which 180 million shares were designated Class A common stock and 20 million
shares were designated Class B common stock.

    On August 28, 1998, the Company completed a two-for-one stock split of the
Company's Class A and Class B Common Stock in the form of a 100 percent stock
dividend to all shareholders of record as of the close of business on August 7,
1998. In addition, on December 22, 1998, the Company completed another
two-for-one stock split of the Company's Class A and Class B Common Stock in the
form of a 100 percent stock dividend to all shareholders of record as of the
close of business on December 8, 1998.

    On May 19, 1999, the Company completed a two-for-one stock split of the
Company's Class A Common Stock and Class B Common Stock in the form of a 100
percent stock dividend.

    The accompanying financial statements give retroactive effect to the above
recapitalizations.

RECOGNITION OF REVENUE

    The Company recognizes revenue on telecommunications services ratably over
the term of the applicable lease agreements with customers. Amounts billed in
advance of the service provided are recorded as deferred revenue. The Company
also provides installation services for its customers, and as these services
typically are completed within a year, the Company records the revenues and
related costs for these services under the completed contract method. In
addition, the Company occasionally grants Indefeasible Rights of Use ("IRU's")
to portions of its network. For those grants occurring prior to completion of
the portion of the network granted, the Company recognizes revenue on these
telecommunication services using the percentage of completion method. Under the
percentage of completion method, progress is generally measured on performance
milestones relating to the contract where such milestones fairly reflect the
progress toward contract completion. Network construction costs include all
direct material and labor costs and those indirect costs related to contract
performance. General and administrative costs are charged to expense as
incurred. If necessary, the estimated loss on an uncompleted contract is
expensed in the period in which it is identified. Contract costs are estimated
using allocations of the total cost of constructing the specific phase of the
network. Revisions to estimated profits on contracts are recognized in the
period that they become known.

STOCK OPTIONS

    The Company has adopted the disclosure-only provisions of SFAS No. 123,
"Accounting for Stock-Based Compensation." The Company applies APB Opinion No.
25, "Accounting for Stock Issued to Employees," and related interpretations in
accounting for its stock options.

                                      F-9
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 2: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
CONSULTING AND EMPLOYMENT INCENTIVES

    The amounts represent the value of common stock, warrants and options issued
to consultants, officers, employees and directors of the Company as incentive to
provide services to the Company. The 1997 amounts represent the value of options
to purchase 24,762,600 shares of the Company's common stock issued in 1997 to
officers, employees and directors of the Company. The options have been valued
in accordance with APB Opinion No. 25 at the difference between the exercise
price of the options and the fair market value of the Company's common stock at
the date of grant.

EARNINGS PER SHARE

    In accordance with the Financial Accounting Standards Board's ("FASB")
Statement of Financial Accounting Standards ("SFAS") No. 128, "Earnings Per
Share," basic earnings per share is computed based upon the weighted average
number of common shares outstanding during the periods. Diluted earnings per
share is computed based upon the weighted average number of common shares
outstanding plus the assumed issuance of common stock equivalents computed in
accordance with the treasury stock method.

DEFERRED REVENUE

    Deferred revenue represents prepayments received from customers for future
use of the Company's fiber optic network as well as prepayment for installation
services, which have not yet been provided. Lease payments are structured as
either prepayments or monthly recurring charges. Prepayments are accounted for
as deferred revenues and recognized over the term of the respective customer
lease agreement. At December 31, 1998, the Company had received prepaid lease
payments in excess of revenue recognized totaling $41.6 million.

IMPACT OF RECENTLY ISSUED ACCOUNTING STANDARDS

    In June 1997, the FASB released SFAS No. 130 "Reporting Comprehensive
Income," governing the reporting and display of comprehensive income and its
components. This statement is effective for financial statements issued for
periods beginning after December 15, 1997. The Company adopted this standard as
required in fiscal 1998 in its Statement of Changes in Stockholders' Equity
(Deficiency).

    In June 1997, the FASB issued SFAS No. 131, "Disclosures About Segments of
an Enterprise and Related Information." SFAS No. 131 redefines how operating
segments are determined and requires disclosure of certain financial and
descriptive information about a company's operating segments. In 1998 the
Company adopted SFAS No. 131. The Company currently operates in one business
segment.

    In June 1998, the FASB issued SFAS No. 133, "Accounting for Derivatives and
Hedging Activities," which establishes accounting and reporting standards for
derivative instruments and hedging activities. This standard is effective for
all fiscal quarters of fiscal years beginning after June 15, 1999. The Company
does not expect the adoption of SFAS No. 133 to have an impact on its results of
operations, financial position or cash flows.

                                      F-10
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 3: ACCOUNTS RECEIVABLE

    Accounts receivable consists of the following (in 000's):

<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              -------------------
                                                                1998       1997
                                                              --------   --------
<S>                                                           <C>        <C>
Trade accounts receivable...................................  $   560      $837
Costs and earnings in excess of billings....................   30,134        --
Other.......................................................      216        --
                                                              -------      ----
                                                              $30,910      $837
                                                              =======      ====
</TABLE>

    At December 31, 1998, three customers accounted for 43%, 40% and 14%,
respectively, of the Company's combined accounts receivable.

NOTE 4: FIBER OPTIC TRANSMISSION NETWORK AND RELATED EQUIPMENT

    Fiber optic transmission network and related equipment consists of the
following (in 000's):

<TABLE>
<CAPTION>
                                                              DECEMBER 31,
                                                           -------------------
                                                             1998       1997
                                                           --------   --------
<S>                                                        <C>        <C>
Material-fiber optic cable...............................  $ 23,436   $ 1,133
Engineering and layout costs.............................     7,101     3,322
Fiber optic cable installation costs.....................    16,639     1,869
Other....................................................     4,242     2,019
Construction in progress.................................   195,256    17,835
                                                           --------   -------
                                                            246,674    26,178
Less: accumulated depreciation...........................    (2,398)   (1,244)
                                                           --------   -------
                                                           $244,276   $24,934
                                                           ========   =======
</TABLE>

    Construction in progress includes amounts incurred in the Company's
expansion of its network. These amounts include fiber optic cable and other
materials, engineering and other layout costs, fiber optic cable installation
costs and other network assets held under capital leases. Construction in
progress also includes payments for rights of way for the underlying sections of
the network build.

NOTE 5: PROPERTY AND EQUIPMENT

    Property and equipment consists of the following:

<TABLE>
<CAPTION>
                                                             DECEMBER 31,
                                                   ---------------------------------
                                                     1998       1997     USEFUL LIFE
                                                   --------   --------   -----------
<S>                                                <C>        <C>        <C>
Leasehold improvements...........................   $  614      $538     174 months
Furniture, equipment and software................    2,581       352     5 years
                                                    ------      ----
                                                     3,195       890
Less: accumulated depreciation and
  amortization...................................     (479)     (131)
                                                    ------      ----
                                                    $2,716      $759
                                                    ======      ====
</TABLE>

                                      F-11
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 6: INVESTMENT IN/ADVANCES TO JOINT VENTURE

    The Company has a joint venture agreement with Racal Telecommunications,
Inc. ("Racal"), that provides broad-based transatlantic communication services
between New York and London. As of December 31, 1997, neither party had made a
capital contribution. The balance of the investment at December 31, 1997
represents advances made to the joint venture by the Company. During 1998, each
party made capital contributions of $4.3 million. The Company and Racal may each
be required to contribute additional capital as needed for their respective 50%
interests. The Company accounts for its investment using the equity method. For
1998, the Company recorded a $146,000 loss from the joint venture based on its
50% interest in the joint venture. Included within the Company's accounts
receivable is $70,000 for administrative services provided to the joint venture
which were not reimbursed as of December 31, 1998.

NOTE 7: GERMAN NETWORK BUILD

    In February, 1999, the Company entered into a joint venture with Viatel,
Inc. and Carrier 1 Holdings, Ltd. to jointly build a national fiber optic
telecommunications network in Germany. Upon completion of construction, the
joint venture will be dissolved and the Company will own its own separate German
broadband network. In connection with the terms of this agreement, the Company
made a deposit payment of $4.7 million, during the third quarter of 1998. Upon
signing a definitive agreement, the Company provided an irrevocable standby
letter of credit in the amount of $64 million as security for the construction
costs of the network, which, in addition to the deposit payment made, covers the
Company's portion of the estimated construction costs.

NOTE 8: RELATED PARTY TRANSACTIONS

    The Company is a party to a management agreement under which the Company's
controlling shareholder, Metromedia Company, provides consultation and advisory
services relating to legal matters, insurance, personnel and other corporate
policies, cash management, internal audit and finance, taxes, benefit plans and
other services as are reasonably requested. The management agreement terminates
on December 31, of each year, and is automatically renewed for successive
one-year terms unless either party terminates upon 60 days prior written notice.
The 1998 management fee under the agreement was $500,000 per year, payable
quarterly at a rate of $125,000. The Company is also obligated to reimburse
Metromedia Company for all its out-of-pocket costs and expenses incurred and
advances paid by Metromedia Company in connection with the management agreement.
In 1997, Metromedia Company received no money for its out-of-pocket costs and
expenses or for interest on advances extended by it to the Company under the
management agreement.

    In March and June 1997, the Company entered into two one-year leases for
office space with an affiliate. Subsequent to June 1997, the affiliate sold this
property. For the year ended December 31, 1997, office rent expenses for these
leases amounted to approximately $110,000.

NOTE 9: SETTLEMENT AGREEMENTS

    In February 1996, the Company entered into a settlement agreement with a
former officer regarding the termination of his employment. This agreement
provided for the Company to make payments to the officer totaling $1,003,000,
including interest. The former officer's services effectively terminated prior
to December 31, 1995. Accordingly, as of December 31, 1995, the Company recorded
$876,146 as a liability in accordance with the terms of the settlement
agreement. The settlement agreement also reaffirmed an option previously issued
to this former officer on May 1, 1995, which entitles the holder to purchase

                                      F-12
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 9: SETTLEMENT AGREEMENTS (CONTINUED)
415,766 shares of the Company's common stock at $0.003 per share through
February 1, 1999. In 1997 the Company repurchased and retired the warrants held
by this former officer. On November 14, 1996, the Company amended the above
referenced settlement agreement with the former officer, whereby a consultant to
the Company agreed to purchase common stock of the company from the former
officer and certain of his affiliates in exchange for $640,000 and the complete
satisfaction of the aforementioned liability.

    On February 11, 1997, the Company entered into an agreement with a
consultant/director. Pursuant to the agreement the Company agreed to pay the
consultant/director a fee of $250,000 in full and complete payment for all
services provided to the Company by the consultant/director and for any fees or
compensation due to the consultant/director resulting from any prior agreements
with the Company, and the consultant/director agreed to release the Company from
any claims against the Company.

    In March 1998, the Company entered into a settlement agreement with Howard
Katz, Realprop Capital Corporation and Evelyn Katz, among others, which settled
and resulted in the dismissal of litigation for which the Company was a
defendant in KATZ, ET AL. V. NATIONAL FIBER NETWORK, INC., ET AL., No. 97 Civ.
2764 (JGK) (the "Katz Litigation").

                                      F-13
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 10:  NOTES PAYABLE

    On November 25, 1998, the Company issued and sold $650.0 million of 10%
Senior Notes due November 15, 2008. The net proceeds of the 10% Senior Notes
were approximately $630.0 million, after deducting offering costs, which are
included in other long-term assets. Interest on the 10% Senior Notes is payable
semi-annually in arrears on May 15 and November 15 of each year, commencing May
15, 1999. Approximately $91.5 million of the net proceeds was utilized to
purchase certain pledged securities, the proceeds of which, together with
interest earned on such securities, will be used to satisfy the Company's
semi-annual interest obligations through May 15, 2000. The 10% Senior Notes are
subject to redemption at the option of the Company, in whole or in part, at any
time on or after November 15, 2003, at specified redemption prices. In addition,
prior to November 15, 2001, the Company may use the net cash proceeds from
certain specified equity transactions to redeem up to 35% of the 10% Senior
Notes at specified redemption prices. The indentures pursuant to which the 10%
Senior Notes are issued contain certain covenants that, among other matters,
limit the ability of the Company and its subsidiaries to incur additional
indebtedness, issue stock in subsidiaries, pay dividends or make other
distributions, repurchase equity interests or subordinated indebtedness, engage
in sale and leaseback transactions, create certain liens, enter into certain
transactions with affiliates, sell assets, and enter into certain mergers and
consolidations.

    In the event of a change in control of the Company as defined in the
indentures, holders of the 10% Senior Notes will have the right to require the
Company to purchase their Notes, in whole or in part, at a price equal to 101%
of the stated principal amount thereof, plus accrued and unpaid interest, if
any, thereon to the date of purchase. The 10% Senior Notes are senior unsecured
obligations of the Company, and are subordinated to all current and future
indebtedness of the Company's subsidiaries, including trade payables.

NOTE 11:   EQUITY TRANSACTIONS

COMMON STOCK

    On November 3, 1997, the Company completed the initial public offering (the
"IPO") of 72,864,000 shares of its Class A common stock, at an offering price of
$2 per share. The net proceeds to the Company from the IPO, after deducting
expenses of the IPO, were approximately $133.9 million.

    In addition, on October 28, 1997, a total of 76,519,520 shares of the common
stock of the Company owned by stockholders prior to the IPO were exchanged for
an equal number of shares of Class A common stock. The Company also reserved for
issuance 34,083,888 shares of Class A common stock for conversion of the
Class B common stock.

    On October 28, 1996, a shareholder granted to the Company's Chairman of the
Board an option to purchase 3,199,112 shares of common stock of the company for
an aggregate exercise price of $500,000. By letter dated December 3, 1996, the
option was amended to reduce the number of option shares to 2,590,712 shares.
The Chairman thereafter assigned the option to the Company. On February 11,
1997, the Company exercised the option by payment of $500,000.

    On April 15, 1996, the Company entered into a stock purchase agreement with
Vento & Company of New York, LLC ("VCNY"). Pursuant to this agreement, the
Company issued 12,168,000 shares of common stock to VCNY as consideration for
services provided by VCNY. The Company estimated the value of the stock issued
approximated $2,760,000.

                                      F-14
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 11:   EQUITY TRANSACTIONS (CONTINUED)
    Concurrent with the execution of the aforementioned stock purchase
agreement, the parties entered into a consulting agreement. The term of the
agreement was from April 15, 1996 to April 15, 2001. Under the terms of the
agreement, VCNY was to provide guidance and advice with respect to the
management of the day-to-day operations of the Company's fiber optic
transmission network. In consideration for such services, the Company reimbursed
VCNY for all reasonable personnel and travel costs incurred by VCNY with respect
to the performance of these services. On October 9, 1996, the Company entered
into a settlement agreement with the Company's former chief executive officer
and VCNY regarding the termination of such officer's employment and services
provided by VCNY. The agreement provided for VCNY to deliver a total of
12,168,000 shares of common stock in exchange for payments made by the Company.
The payments were not made and the sale of the shares and the Company's
obligation to buy the shares was deemed null and void.

    In September 1996, the Company sold 87,472 shares of common stock to three
individuals for total proceeds of $23,500.

    In August 1996, the Company issued 1,460,160 shares of common stock for
consulting services. The Company recorded a non-cash charge of $334,800 for such
issuance.

    In July 1996, the Company issued 97,344 shares of common stock as
consideration for consulting services. The Company recorded a non-cash charge of
$21,200 for such issuance. In addition, the Company issued 1,204,632 shares to
three employees for services rendered. The transaction was later rescinded and
the shares were returned to the Company.

    In June 1996, the Company sold a total of 304,200 shares of common stock to
two individuals for total proceeds of $100,000. Concurrent with the issuance of
these shares, the Company issued warrants to these shareholders entitling the
holders to purchase a total of 304,200 shares at $0.33 per share for a
three-year period.

    On January 12, 1996, the Company entered into an agreement with its legal
counsel to issue common stock as additional consideration for legal services
provided. Pursuant to this agreement, as amended, the Company issued a total of
3,928,840 shares of its common stock. Management has estimated the value of the
3,928,840 shares issued to be $907,301 and has recorded a non-cash charge in
connection with such issuance.

PREFERRED STOCK

    On April 30, 1997, the Company sold an aggregate of 67,226,600 shares of
Series B convertible preferred stock, par value $0.01 per share (the "Series B
preferred stock"), to Metromedia Company and affiliates ("Metromedia") for an
aggregate purchase price of $32.5 million (the "Metromedia Investment"). Each
share of the Series B preferred stock was convertible into 507 shares of the
Company's common stock. On October 28, 1997, the Series B convertible preferred
shares were converted into 34,083,888 shares of Class B common stock. Further,
on October 28,1997, a total of 314,616 shares of Class B common stock
outstanding were converted into an equivalent number of shares of Class A common
stock.

    A portion of the proceeds from the Metromedia Investment was used to repay
the Metromedia Loan, discussed below, and accrued interest thereon ($4,058,127),
repay other short-term indebtedness

                                      F-15
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 11:   EQUITY TRANSACTIONS (CONTINUED)
($3,485,000), and redeem (for $2,115,000) all of the outstanding shares of the
Company's preferred stock (the "Series A preferred stock") and related warrants.

    Through April 30, 1997, Metromedia loaned the Company an aggregate of
$4,000,000 (the "Metromedia Loan"). A portion of the proceeds from the
Metromedia Loan was used to purchase 4,707,760 shares of the Company's common
stock and warrants to purchase 1,663,064 shares of its common stock.

    No shares of the Company's Series A preferred stock or Series B preferred
stock remained outstanding at December 31, 1997. Both the Series A and Series B
preferred stock of the Company have been eliminated pursuant to actions by the
Board of Directors.

STOCK WARRANTS

    A. In 1996, the Company entered into an agreement with a Customer for
exclusive usage rights for fibers on portions of its network. In connection with
this agreement, the Company borrowed $4.9 million from the customer. On
April 30, 1997, the Company amended this agreement to satisfy the obligations of
the above-referenced note by providing (i) additional leased fiber miles,
(ii) a cash payment of $1,370,000 and (iii) a warrant to purchase common stock
of the Company. In July 1998, the agreement was amended to include additional
fiber miles on the Company's network and for cancellation of the warrants.

    B. From October 1995 through February 1996, the Company issued and sold a
private offering of $858,000 of convertible subordinated notes. Concurrent with
the issuance of these notes, warrants were issued by the Company to the
noteholders to purchase 1,044,016 shares of common stock at $1.00 per share
through November 2000. In 1996 and 1997, in exchange for the extension of the
due dates of the notes, the Company issued warrants to purchase 1,318,084 shares
of its common stock at $1.00 per share and recorded a charge of $111,306 and
$220,036 in 1996 an 1997, respectively. In 1997, the Company repaid the
outstanding balance of these notes plus all accrued interest. As of
December 31, 1998, 1,564,032 of such warrants have been exercised.

    C. In September 1996, the Company entered into a loan agreement with a
finance company for $550,000. The loan bore interest at 10% per annum and was
repaid in 1997. As an incentive for the loan, the Company issued to the finance
company warrants to purchase 754,416 shares of common stock at an exercise price
of $0.74. The warrants are exercisable through September 1999. In 1996, the
Company recorded a non-cash charge of $13,640 in connection with the issuance of
the warrants. All of the warrants have been exercised.

    D. In August 1995, the Company initiated a $600,000 private offering of
subordinated notes which bore interest at an annual rate of 15% and were repaid
in 1997. With the issuance of the notes, warrants were issued to the
noteholders. In April 1996, the Company issued a total of 474,872 shares of the
Company's common stock in exchange for the surrender and cancellation of the
warrants and a three-month extension of the maturity date of the notes. In 1996,
the Company recorded a non-cash charge of $107,322 in connection with such
issuance.

    E. In April 1995, the Company entered into a loan agreement with a customer
for $500,000 bearing interest at 11% per annum. In July 1997, the note was
repaid in full. In connection with this loan, the Company issued the customer a
warrant entitling the holder to purchase a total of 5,353,336 shares of the
Company's common stock. In February 1997, this warrant was exchanged for a new
warrant to purchase

                                      F-16
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 11:   EQUITY TRANSACTIONS (CONTINUED)
3,650,400 shares of the Company's common stock at $0.61 per share. The new
warrant expires on February 13, 2000. As of December 31, 1998, none of the
warrants have been exercised.

    F. On December 13, 1996, the Company issued and sold to a private investor,
for an aggregate cash consideration of $2,025,000, (i) 1,200,000 shares of 10%
cumulative convertible preferred stock (the "Series A preferred stock") bearing
dividends at a rate of $.17 per share per annum, (ii) warrants to purchase
912,600 shares of Class A common stock at an exercise price of $0.62 per share
and (iii) a contingent stock subscription warrant to purchase a number of shares
of Class A common stock (such number to be determined based on certain future
events) at an exercise price of $0.005 per share. In connection with the
Metromedia Investment, the private investor allowed the Series A preferred stock
and the contingent warrants to be redeemed at an aggregate redemption price of
$2,115,000 (which includes accrued but unpaid dividends on the Series A
preferred stock) and the number of shares underlying the private investor's
warrants to be increased from 912,600 to 1,825,200. In January 1998, the private
investor made a cashless exercise of all its warrants and the number of its
shares issuable upon exercise was reduced by the number of shares at the closing
on the day of exercise having a value equal to the aggregate exercise price.
Accordingly, the Company issued the private investor 1,382,120 common shares for
all its warrants.

    G. In June 1996, the Company granted 1,216,800 common stock purchase
warrants to the Company's legal counsel exercisable at $.01 per share for a
period of four years as additional consideration for legal services provided.
The Company recorded a non-cash charge of $200,000 for such issuance. As of
December 31, 1998, all of the warrants have been exercised.

    As of December 31, 1998, in the aggregate, the Company had reserved
approximately 4,456,100 shares of its Class A common stock for exercise of
outstanding warrants.

STOCK OPTIONS

    In 1997, the Company granted to certain officers, employees and directors
options to purchase up to 24,761,888 shares of its Class A common stock. The
options have exercise prices between $0.25 and $0.96 per share and expire in
2007. The Company recorded a non-cash charge of $19,218,591 for such issuance.

    On October 28, 1997, the Stockholders of the Company approved the Metromedia
Fiber Network, Inc. 1997 Incentive Stock Plan ("1997 Option Plan"). The 1997
Option Plan authorized the award of up to 8,000,000 options to acquire Class A
common stock of the Company to directors, officers and employees of the Company
and others who are deemed to provide substantial and important services to the
Company. In 1997, options to purchase 4,900,000 shares of the Company's Class A
common stock were granted at an exercise price of $2.00 per share, the market
price at the date of grant. In 1998, options to purchase 3,400,000 shares of the
Company's Class A common stock were granted at exercise prices ranging from
$1.94 to $4.30 per share, the market price at the date of grant. Of these
grants, 1,115,000 were canceled and 235,000 were exercised as of December 31,
1998.

    On May 18, 1998, the Stockholders of the Company approved the Metromedia
Fiber Network, Inc. 1998 Incentive Stock Plan ("1998 Option Plan"). The 1998
Option Plan authorized the award of up to 20,000,000 options to acquire Class A
common stock of the Company to directors, officers and employees of the Company
and others who are deemed to provide substantial and important services to the
Company. Options to purchase 6,918,000 shares of the Company's Class A common
stock were granted at exercise prices ranging from $3.64 to $13.25 per share,
the market prices at the dates of grant.

                                      F-17
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 11:   EQUITY TRANSACTIONS (CONTINUED)
    The compensation committee of the Company's Board of Directors is
responsible for determining the type of award, when and to whom awards are
granted, the number of shares and terms of the awards and the exercise price.
The options are exercisable for a period not to exceed ten years from the date
of the grant. Vesting periods range from immediate vesting to four years.

    The following table summarizes the stock option transactions for the two
years ended December 31, 1998:

<TABLE>
<CAPTION>
                                                                NUMBER OF
                                                                 OPTIONS       EXERCISE PPRICES
                                                              --------------   ----------------
<S>                                                           <C>              <C>
Granted prior to December 31, 1997..........................    29,661,888     $0.25 to $ 2.00
                                                                ----------
Balance outstanding at December 31, 1997....................    29,661,888     0.25 to   2.00
                                                                ----------
Granted.....................................................    10,318,000     1.94 to  13.25
Excercised..................................................     1,100,048     0.25 to   3.74
Cancelled...................................................     1,135,000     0.25 to   4.30
                                                                ----------
Balance outstanding at December 31, 1998....................    37,744,840     0.25 to  13.25
                                                                ==========
Exercisable at:

December 31, 1997...........................................    24,482,344     0.25 to   0.96
                                                                ==========
December 31, 1998...........................................    24,881,840     0.25 to   2.00
                                                                ==========
</TABLE>

    The following table summarizes information about stock options outstanding
at December 31, 1998:

<TABLE>
<CAPTION>
                                                      OPTIONS GRANTED               OPTIONS EXERCISABLE
                                           -------------------------------------   ----------------------
                                                           WEIGHTED                              WEIGHTED
                            RANGES OF        NUMBER        AVERAGE      AVERAGE      NUMBER      AVERAGE
                            EXERCISE       OUTSTANDING    REMAINING     EXERCISE   EXERCISABLE   EXERCISE
YEAR OF GRANT                PRICES        AT 12/31/98   LIFE (YEARS)    PRICE     AT 12/31/98    PRICE
- -------------            ---------------   -----------   ------------   --------   -----------   --------
<S>                      <C>               <C>           <C>            <C>        <C>           <C>
1997..................   $0.25 to $ 2.00   27,596,840        8.40        $0.49     24,881,840     $0.33
1998..................   1.94 to  13.25    10,148,000        9.42         4.88             --        --
                                           ----------        ----        -----     ----------     -----
                                           37,744,840        8.67        $1.67     24,881,840     $0.33
                                           ==========        ====        =====     ==========     =====
</TABLE>

    Pro forma information regarding net income and earnings per share is
required by Statement of Financial Standards No. 123, "Accounting for
Stock-Based Compensation", and has been determined as if the Company had
accounted for its employees' stock options under the fair value method provided
by that Statement. The fair value of the options was estimated at the date of
grant using the Black-Scholes option pricing model with the following
assumptions for vested and non-vested options:

<TABLE>
<CAPTION>
                                                                   DECEMBER 31,
                                                      ---------------------------------------
                                                            1998                   1997
                                                      ----------------       ----------------
<S>                                                   <C>                    <C>
Risk-free interest yield............................         5.53-6.56%             5.73-6.56%
Volatility factor...................................              .499                   .369
Dividend yield......................................                --                     --
Average life........................................           5 years                5 years
</TABLE>

                                      F-18
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 11:   EQUITY TRANSACTIONS (CONTINUED)
    The Black-Scholes options valuation model was developed for use in
estimating the fair value of traded options, which have no vesting restrictions
and are fully transferable. In addition, option valuation models require the
input of highly subjective assumptions including the expected stock price
volatility.

    Because the Company's employee stock options have characteristics
significantly different from those of traded options, and because changes in the
subjective input assumptions can materially affect the fair value estimate, in
management's opinion, the existing models do not necessarily provide a reliable
single measure of the fair value of its employee stock options.

    For purposes of pro forma disclosures, the estimated fair value of the
options is amortized to expense over the vesting period of the options. The
Company's pro forma information is as follows (000's):

<TABLE>
<CAPTION>
                                                                YEAR ENDED
                                                               DECEMBER 31,
                                                            -------------------
                                                              1998       1997
                                                            --------   --------
<S>                                                         <C>        <C>
Pro forma net loss applicable to common stock.............   $ (864)   $(28,043)
Pro forma net loss per share applicable to common stock,
  basic...................................................   $(0.01)   $  (0.30)
</TABLE>

NOTE 12: SIGNIFICANT CUSTOMERS

    During the years ended December 31, 1998 and 1997 one customer accounted for
40% and 21%, respectively of the Company's total revenue. During the years ended
December 31, 1998 and 1997 another customer accounted for 35% and 15%,
respectively of the Company's total revenue. During the years ended
December 31, 1998 a third customer accounted for 12% of the Company's total
revenue.

NOTE 13: INCOME TAXES

    Income tax expense (benefit) for the years ended December 31, 1998, 1997 and
1996 is as follows (in thousands):

<TABLE>
<CAPTION>
                                                           1998       1997       1996
                                                         --------   --------   --------
<S>                                                      <C>        <C>        <C>
CURRENT
  Federal..............................................   $4,513      $ --       $ --
  State and local......................................    2,720        --         --
                                                          ------      ----       ----
                                                           7,233        --         --
                                                          ------      ----       ----
DEFERRED
  Federal..............................................   (2,375)       --         --
  State and local......................................   (1,456)       --         --
                                                          ------      ----       ----
                                                          (3,831)       --         --
                                                          ------      ----       ----
                                                          $3,402      $ --       $ --
                                                          ======      ====       ====
</TABLE>

                                      F-19
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 13: INCOME TAXES (CONTINUED)
    Total income tax expense (benefit) differed from the amounts computed by
applying the federal statutory income tax rate (35%) to earnings (loss) before
income tax expense (benefit) as a result of the following items for the years
ended December 31, 1998, 1997 and 1996 (in thousands):

<TABLE>
<CAPTION>
                                                           1998       1997       1996
                                                         --------   --------   --------
<S>                                                      <C>        <C>        <C>
U.S. statutory rate applied to pre-tax income (loss)...   $1,492      $ --       $ --
State and local taxes, net of federal tax benefit......      834        --         --
Non deductible expenses................................    1,118        --         --
Valuation allowance....................................       --        --         --
Others, net............................................      (42)       --         --
                                                          ------      ----       ----
                                                          $3,402      $ --       $ --
                                                          ======      ====       ====
</TABLE>

    The tax effects of temporary differences that give rise to significant
portions of the deferred tax assets and liabilities at December 31, 1998 and
1997 are as follows (in thousands):

<TABLE>
<CAPTION>
                                                    1998       1997       1996
                                                  --------   --------   --------
<S>                                               <C>        <C>        <C>
DEFERRED TAX ASSETS
  Deferred revenue..............................  $ 19,923   $  5,173   $   499
  Employee benefits.............................     9,893     10,074     1,425
  Cost of sales of IRU's and sales type
    leases......................................     5,599        573        --
  Net operating losses..........................        --      1,125     3,668
  Others........................................     2,522      1,465     1,047
                                                  --------   --------   -------
                                                  $ 37,937   $ 18,410   $ 6,639
                                                  --------   --------   -------
  Valuation allowance...........................   (18,309)   (18,309)   (6,579)
                                                  --------   --------   -------
                                                    19,628        101        60

DEFERRED TAX (LIABILITIES)
  Capitalized leases............................   (14,782)        --        --
  Depreciation and amortization.................    (1,003)       (89)      (48)
  Other.........................................       (12)       (12)      (12)
                                                  --------   --------   -------
                                                   (15,797)      (101)      (60)
                                                  --------   --------   -------
  Net deferred asset............................  $  3,831   $     --   $    --
                                                  ========   ========   =======
</TABLE>

    A portion of the deferred tax asset has been reserved since it is not
certain that future taxable income will be realized in the carryforward period
or in year of asset turnaround.

    There was no provision for federal or state income taxes for the years ended
December 31, 1997 and 1996. At December 31, 1998, the Company expects to have
fully utilized its net operating losses

NOTE 14:  401(K) PLAN

    In 1998, the Company implemented a 401(k) Plan (the "Plan") which permits
employees to make contributions to the Plan on a pre-tax salary reduction basis
in accordance with the Internal Revenue Code. All full-time employees are
eligible to participate at the beginning of the quarter following three

                                      F-20
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 14:  401(K) PLAN (CONTINUED)
months of service. Eligible employees may contribute up to 15% of their annual
compensation. The Company matches 50% of the employees first 6% of
contributions. The Company contributed $78,000 for 1998 as these matching
contributions. The company bore the nominal administrative cost of the plan
during 1998.

NOTE 15: RECONCILIATION OF EARNINGS PER SHARE (IN THOUSANDS):

<TABLE>
<CAPTION>
                                                   YEAR ENDED DECEMBER 31,
                                                ------------------------------
                                                  1998       1997       1996
                                                --------   --------   --------
<S>                                             <C>        <C>        <C>
Net income (loss).............................  $    986   $(26,259)  $(10,359)
Deduct dividend on preferred shares...........        --         77         --
                                                --------   --------   --------
Net loss applicable to common stock...........       986    (26,336)   (10,359)
                                                ========   ========   ========
Shares
Weighted average number of common shares
  outstanding--basic..........................   186,990     94,894     71,716
Net income (loss) per common share--basic.....  $   0.01   $  (0.28)  $  (0.14)
                                                ========   ========   ========
Weighted average number of common shares
  outstanding--basic..........................   186,990     94,894     71,716
Assuming conversion of warrants and options
  outstanding.................................    32,534         --         --
                                                --------   --------   --------
Weighted average number of common shares
  outstanding--diluted........................   219,524     94,894     71,716
                                                ========   ========   ========
Net income (loss) per common share--diluted...  $   0.01        N/A        N/A
                                                ========   ========   ========
</TABLE>

NOTE 16:  COMMITMENTS AND CONTINGENCIES

NETWORK CONSTRUCTION PROJECTS

    In 1998, the Company commenced construction of various networks outside of
the New York Metropolitan area. The Company's commitment to purchase materials
and contracts for the construction of fiber optic network systems was
approximately $70 million as of December 31, 1998.

FRANCHISE, LICENSE, RIGHT-OF WAY AGREEMENTS AND OPERATING AND CAPITAL LEASES

    The Company has entered into various franchise and license agreements with
municipalities and utility-related companies to, in most instances, install,
operate, repair, maintain and replace cable, wire, fiber or other transmission
media and the related equipment and facilities. The terms for these agreements
vary in length, with various renewal and termination provisions. The Company
charges the portions of these agreements incurred to construction-in-progress
until the related portion of the network is completed. The fees charged to
operations in connection with these agreements were approximately $1,673,000,
$607,000 and $459,000 for the years ended December 31, 1998, 1997 and 1996,
respectively.

                                      F-21
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 16:  COMMITMENTS AND CONTINGENCIES (CONTINUED)
    In addition, the company leases office and operation facilities and various
equipment, which expire at various times through March 31, 2010. Rent expense
charged to operations was approximately $958,000, $268,000 and $158,000 for the
years ended December 31, 1998, 1997 and 1996, respectively.

    The Company has entered into capital lease agreements for certain network
assets and for certain rights-of-ways. Total assets acquired under capital
leases were approximately $27,876,000 at December 31, 1998. The capital leases
are held as construction-in-progress until the related portion of the network is
completed.

    Approximate minimum payments under the aforementioned agreements are (in
thousands):

<TABLE>
<CAPTION>
                                                 FRANCHISE,
                                                LICENSE AND
                                                RIGHT-OF-WAY   CAPITAL    OPERATING
                                                 AGREEMENTS     LEASES     LEASES
                                                ------------   --------   ---------
<S>                                             <C>            <C>        <C>
For the year ended December 31,
1999..........................................    $ 1,018      $ 1,551     $ 1,994
2000..........................................      1,121        1,797       2,032
2001..........................................      1,121        1,859       2,054
2002..........................................        971        1,923       2,050
2003..........................................        661        1,991       1,532
Thereafter....................................      7,922       42,972       7,339
                                                  -------      -------     -------
Total minimum lease payments..................    $12,814       52,093     $17,001
                                                  =======                  =======
Less amounts representing interest............                  29,363
                                                               -------
Present value of future minimum lease
  payments....................................                  22,730
Less amounts due in one year..................                      55
                                                               -------
                                                               $22,675
                                                               =======
</TABLE>

EMPLOYMENT AGREEMENTS

    The Company has executed employment contracts for future services, for up to
five years, with certain senior executives for whom the Company has a minimum
commitment aggregating approximately $3.4 million at December 31, 1998. This
amount is not included in the consolidated financial statements at December 31,
1998.

LITIGATION

    On or about October 20, 1997, Vento & Company of New York, LLC commenced an
action against Metromedia Fiber Network, Stephen A. Garofalo, Peter Silverman,
the law firm of Silverman, Collura, Chernis & Balzano, P.C., Peter Sahagen,
Sahagen Consulting Group of Florida (collectively, the "Sahagen Defendants") and
Robert Kramer, Birdie Capital Corp., Lawrence Black, Sterling Capital LLC,
Penrush Limited, Needham Capital Group, Arthur Asch, Michael Asch and Ronald
Kuzon (the "Kramer Defendants") in the United States District Court for the
Southern District of New York (No. 97 CIV 7751). On or about May 29, 1998, Vento
& Company filed an amended complaint. In its complaint, as amended, Vento &
Company alleges four causes of action in connection with its sale of 900,000
shares (not adjusted for subsequent stock splits) of Class A Common Stock to
Peter Sahagen and the Kramer Defendants on

                                      F-22
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 16:  COMMITMENTS AND CONTINGENCIES (CONTINUED)
January 13, 1997. The four causes of action include: (i) violation of Section
10(b) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated under
such Act; (ii) fraud and fraudulent concealment; (iii) breach of fiduciary duty;
and (iv) negligent misrepresentation and omission. On the first and second
causes of action, Vento & Company is seeking, among other things, rescission of
the Vento & Company sale, or alternatively, damages in an amount which we cannot
currently ascertain but believe to be in excess of $36 million, together with
interest. On the third and fourth causes of action, Vento & Company is seeking
damages in an amount which we cannot currently ascertain but believe to be in
excess of $36 million, together with interest. Vento & Company is also seeking
punitive damages in the amount of $50 million, reasonable legal fees and the
cost of this action. All the defendants, including Metromedia Fiber Network and
Stephen A. Garofalo, have moved to dismiss Vento and Company's amended
complaint.

    On or about June 12, 1998, Claudio E. Contardi commenced an action against
Peter Sahagen, Sahagen Consulting Group of Florida and Metromedia Fiber Network
in the United States District Court for the Southern District of New York (No.
98 CIV 4140). Mr. Contardi alleges a cause of action for, among other things,
breach of a finder's fee agreement entered into between Mr. Sahagen and
Mr. Contardi on or about November 14, 1996 and breach of an implied covenant of
good faith and fair dealing contained in the finder's fee agreement.
Mr. Contardi is seeking, among other things, a number of shares of Metromedia
Fiber Network which we cannot currently ascertain but believe to be
approximately 225,000 shares (calculated as of the date on which the complaint
was filed and not adjusted for subsequent stock splits) or damages in an amount
which we cannot currently ascertain but believe to be approximately $4.9 million
(calculated as of the date on which the complaint was filed) and all costs and
expenses incurred by him in this action. We have filed an answer to the
complaint and has raised affirmative defenses.

    We intend to vigorously defend both these actions because we believe that we
acted appropriately in connection with the matters at issue in these two cases.
However, we cannot assure you that we will not determine that the advantages of
entering into a settlement outweigh the risk and expense of protracted
litigation or that ultimately we will be successful in defending against these
allegations. If we are unsuccessful in defending against these allegations, an
award of the magnitude being sought in the Vento & Company litigation would have
a material adverse effect on our financial condition or results of operations.

    In addition, we are subject to various claims and proceedings in the
ordinary course of business. Based on information currently available, we
believe that none of such current claims, or proceedings, individually, or in
the aggregate, including the Vento & Company litigation and the Contardi
litigation, will have a material adverse effect on our financial condition or
results of operations, although we can make no assurances in this regard.

                                      F-23
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

               CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED)

                      (IN 000'S, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                               NINE MONTHS ENDED
                                                                 SEPTEMBER 30,
                                                              -------------------
                                                                1999       1998
                                                              --------   --------
<S>                                                           <C>        <C>
Revenue.....................................................  $ 49,397   $20,840
Expenses:
  Cost of sales.............................................    24,414     9,499
  Selling, general and administrative.......................    27,369     9,811
  Consulting and employment incentives......................        --       248
  Settlement agreement......................................        --     3,400
  Depreciation and amortization.............................    15,645       738
                                                              --------   -------
Income (loss) from operations...............................   (18,031)   (2,856)
Other income (expenses):
  Interest income...........................................    19,127     5,028
  Interest expense..........................................   (44,911)      (16)
  Loss from joint venture...................................      (475)     (264)
                                                              --------   -------
Income (loss) before income taxes...........................   (44,290)    1,892
Income taxes................................................        --       825
                                                              ========   =======
Net income (loss)...........................................  $(44,290)  $ 1,067
                                                              ========   =======
Net income (loss) per share, basic..........................  $  (0.23)  $  0.01
                                                              ========   =======
Net income (loss) per share, diluted........................       N/A   $  0.00
                                                              ========   =======
Weighted average number of shares outstanding, basic........   190,639   186,392
                                                              ========   =======
Weighted average number of shares outstanding, diluted......       N/A   217,208
                                                              ========   =======
</TABLE>

                             See accompanying notes

                                      F-24
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

                     CONSOLIDATED BALANCE SHEET (UNAUDITED)

                        (IN 000'S, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                              SEPTEMBER 30,
                                                                  1999
                                                              -------------
<S>                                                           <C>
                           ASSETS
Current assets:
  Cash and cash equivalents.................................   $  352,900
  Marketable securities.....................................       29,628
  Pledged securities, current portion.......................       63,864
  Accounts receivable.......................................      105,934
  Prepaid expenses and other current assets.................        6,311
                                                               ----------
    Total current assets....................................      558,637
Fiber optic transmission network and related equipment,
  net.......................................................      557,662
Property and equipment, net.................................        7,136
Pledged securities..........................................           --
Restricted cash.............................................       94,234
Investment in/advances to joint ventures....................       20,014
Intangible assets, net......................................    1,648,059
Other assets................................................       32,659
                                                               ----------
    Total assets............................................   $2,918,401
                                                               ==========
            LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable..........................................   $   31,680
  Accrued liabilities.......................................      112,382
  Notes payable, current portion............................        5,607
  Deferred revenue, current portion.........................       15,863
  Capital lease obligations, current portion................          569
                                                               ----------
    Total current liabilities...............................      166,101
Senior notes payable........................................      650,000
Notes payable...............................................       14,720
Capital lease obligations...................................       24,316
Deferred revenue............................................       83,271
Commitments and contingencies (see notes)
Stockholders' equity:
  Preferred stock, $.01 par value; 20,000,000 shares
    authorized;
    none issued and outstanding.............................           --
  Class A common stock, $.01 par value; 2,404,031,241 shares
    authorized;
    198,822,053 and 155,210,220 shares issued and
    outstanding, respectively...............................        1,988
  Class B common stock, $.01 par value; 522,254,782 shares
    authorized;
    33,769,272 shares issued and outstanding................          338
  Additional paid-in capital................................    2,065,316
  Accumulated deficit.......................................      (86,526)
  Cumulative comprehensive loss.............................       (1,123)
                                                               ----------
    Total stockholders' equity..............................    1,979,993
                                                               ----------
    Total liabilities and stockholders' equity..............   $2,918,401
                                                               ==========
</TABLE>

                             See accompanying notes

                                      F-25
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

               CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

                                   (IN 000'S)

<TABLE>
<CAPTION>
                                                               NINE MONTHS ENDED
                                                                 SEPTEMBER 30,
                                                              --------------------
                                                                1999        1998
                                                              ---------   --------
<S>                                                           <C>         <C>
Cash flows from operating activities:
Net income (loss)...........................................  $ (44,290)  $  1,067
Adjustments to reconcile net income (loss) to net cash
  provided by operating activities:
  Depreciation and amortization.............................     15,645        738
  Amortization of deferred financing costs..................      1,503         --
  Options issued for settlement agreement...................         --      3,000
  Stocks, options and warrants issued for services..........        401        248
  Reserve for note receivable...............................         --        156
  Loss from joint ventures..................................        329        264
CHANGE IN OPERATING ASSETS AND LIABILITIES (NET OF
  ACQUISITIONS):
  Accounts receivable.......................................    (61,465)   (17,221)
  Accounts payable and accrued liabilities..................     52,350      3,442
  Deferred revenue..........................................     50,765     26,920
  Other.....................................................     (8,925)    (1,749)
                                                              ---------   --------
  Net cash provided by operating activities.................      6,313     16,865
                                                              ---------   --------
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of marketable securities...........................    (29,628)        --
Capital expenditures on fiber optic network,
  telecommunications and related equipment..................   (229,104)   (71,739)
Deposit.....................................................         --     (4,675)
Restricted cash secured by letters of credit................    (63,014)        --
Investment in / advances to joint ventures..................     (3,359)    (2,745)
Capital expenditures on property and equiptment.............     (3,284)    (1,109)
Cash acquired through AboveNet acquisition..................    142,092         --
CSD acquisition (net of cash acquired)......................    (24,966)        --
                                                              ---------   --------
  Net cash used in investing activities.....................   (211,263)   (80,268)
                                                              ---------   --------
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock......................      3,559        892
Payments of CSD pre-acquisition debt........................    (15,028)        --
                                                              ---------   --------
  Net cash provided by (used in) financing activities.......    (11,469)       892
                                                              ---------   --------
NET DECREASE IN CASH AND CASH EQUIVALENTS...................   (216,419)   (62,511)
CASH AND CASH EQUIVALENTS-BEGINNING OF PERIOD...............    569,319    138,846
                                                              ---------   --------
CASH AND CASH EQUIVALENTS-END OF PERIOD.....................  $ 352,900   $ 76,335
                                                              =========   ========
Supplemental information:
  Interest paid.............................................  $  31,375   $     16
                                                              =========   ========
  Income taxes paid.........................................  $   2,771   $  3,080
                                                              =========   ========
Supplemental disclosure of significant non-cash investing
  activites:
  Capital lease obligations.................................  $     908   $ 19,742
                                                              =========   ========
  Accrued capital expenditures..............................  $  65,629   $ 32,743
                                                              =========   ========
</TABLE>

                             See accompanying notes

                                      F-26
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BUSINESS OPERATIONS AND LINE OF BUSINESS

    Metromedia Fiber Network, Inc. and its subsidiaries (collectively, "the
Company") provides dedicated fiber optic infrastructure and high-bandwidth
Internet connectivity for its communications intensive customers. The Company is
a facilities-based provider of technologically advanced, high-bandwidth, fiber
optic communications infrastructure to communications carriers and corporate and
government customers in the United States and Europe. Through its acquisition of
AboveNet Communications, Inc. ("AboveNet"), the Company also provides "one-hop"
connectivity that enables mission critical Internet applications to thrive, as
well as high-bandwidth infrastructure, including managed co-location services.

    The Company currently has operations in, or under construction in, eleven
Tier I cities throughout the United States and seven selected international
markets. The Company intends to expand its presence to include approximately 50
Tier I and Tier II markets in the United States and 17 major international
markets.

    The Company's existing intra-city networks consist of approximately 425,000
fiber miles covering in excess of 800 route miles in six of its announced
markets. Its inter-city network consists of approximately 120,000 fiber miles
primarily covering its 255 route-mile network that the Company has built between
New York City and Washington D.C. The Company has also built or contracted to
acquire (primarily through fiber swaps) a nationwide dark fiber network linking
its intra-city networks.

    In February 1999, the Company entered into an agreement with Viatel, Inc.
and Carrier 1 Holdings, Ltd. to jointly build a dark fiber inter-city network
among selected cities throughout Germany. Once completed, its German network
will consist of approximately 291,000 fiber miles covering 1,350 route miles
connecting 14 major cities. The Company has also swapped strands of fiber in the
United States for strands of fiber on the Circe network, which connects a number
of European markets. In addition to its inter-city networks, the Company is
constructing 16 intra-city networks throughout Europe. Separately, the Company
has also entered into a contract to gain access to dark fiber network facilities
in Toronto, Canada.

    On September 8, 1999, the Company completed the acquisition of AboveNet. The
holders of AboveNet's common stock received 1.175 shares of the Company's class
A common stock for each share of AboveNet common stock. AboveNet is a leading
provider of facilities-based, managed services for customer-owned Web servers
and related equipment, known as co-location, and high performance Internet
connectivity solutions for electronic commerce and other business critical
Internet operations.

    Subsequent to the quarter, on October 7, 1999, the Company entered into a
securities purchase agreement with Bell Atlantic Investments, Inc. ("Bell
Atlantic"), under which Bell Atlantic would purchase up to approximately 25.6
million newly issued shares of its class A common stock at a purchase price of
$28.00 per share and a convertible subordinated note of approximately $975.3
million, which is convertible into shares of its class A common stock at a
conversion price of $34.00 per share. The Company expects this transaction,
which is subject to customary closing conditions, to be completed by the end of
the first quarter of 2000. Assuming the issuance of the 25.6 million shares of
class A common stock and conversion of the convertible subordinated note, this
investment would represent 19.9% of the Company's outstanding shares. Bell
Atlantic has also agreed to pay the Company $550 million over the next three
years in exchange for delivery of fiber optic facilities over the next five
years. The proceeds from these two transactions will be used to fund the
expansion of the Company's network.

    Most of the Company's contracts for the provision of dark fiber are
accounted as operating leases under which it recognizes recurring monthly
revenues. For certain other contracts the Company recognizes

                                      F-27
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
revenue under the percentage of completion method for the provision of dark
fiber. Effective June 30, 1999, the Financial Accounting Standards Board issued
FASB Interpretation No. 43 "Real Estate Sales" ("FIN 43") which requires that
sales or leases of integral equipment be accounted for in accordance with real
estate accounting rules. The Company believes that the staff of the Securities
and Exchange Commission requires the classification of dark fiber cables in the
ground as integral equipment as defined in FIN 43. Accounting for dark fiber
leases as defined by FIN 43 does not change any of the economics of the
contracts. It requires the Company, however, to recognize the revenue from
certain leases as operating leases over the term of the contract as opposed to
the prior method of recognizing revenue during the period over which the Company
delivers the fiber. As a result, this change in accounting treatment reduces the
revenue and income that the Company recognizes in the earlier years of the
contract and spreads it out over the life of the contract regardless of when the
cash was received or the delivery of the fiber took place.

    By way of example, if the Company entered into an agreement for a 25 year
lease for dark fiber with a customer who pays $100.0 million in cash when the
contract is signed, the Company previously recorded revenues of $20.0 million
over the 5 years during which the Company delivered the dark fiber. By contrast,
the real estate accounting rules of FIN 43 would require recognition of revenue
of $4.0 million per year over the 25 year term of the contract., even though the
Company would receive a cash payment of $100.0 million when the contract is
signed.

    The Company implemented FIN 43 real estate accounting for certain of its
leases entered into after June 30, 1999, and has not restated any amounts for
contracts executed prior to such date. As a result, although there was no change
to the economics of the contracts or the timing of the cash to be received by
the Company, the impact of the change in accounting resulted in the Company
recording $10.7 million in revenue for the quarter ended September 30, 1999
rather than $32.7 million that would have been recorded had this change not been
made. Without this change in accounting, the Company would have also recorded
earnings before interest, taxes, depreciation and amortization of $2.6 million
rather than a loss before interest, taxes, depreciation and amortization of
$12.4 million for the three months ended September 30, 1999 due to this change.

BASIS OF PRESENTATION

    The interim unaudited consolidated financial statements in this Report have
been prepared in accordance with the United States Securities and Exchange
Commission's Regulation S-X and consequently do not include all disclosures
required under generally accepted accounting principles. The interim unaudited
consolidated financial statements should be read in conjunction with the audited
Consolidated Financial Statements of the Company and accompanying Notes for the
year ended December 31, 1998, contained in the Company's Annual Report on Form
10-K for the year then ended. The Form 10-K includes information with respect to
the Company's significant accounting and financial reporting policies and other
pertinent information. The Company believes that all adjustments of a normal
recurring nature that are necessary for a fair presentation of the results of
the interim periods presented in this report have been made. Certain balances
have been reclassified to conform to the current period presentation.

STOCK SPLITS

    On August 28, 1998, December 22, 1998 and May 19, 1999 the Company completed
two-for-one stock splits of the Company's class A and class B common stock in
the form of 100 percent stock dividends to all

                                      F-28
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
stockholders of record as of certain specified dates. All share and per share
information, contained herein, give retroactive effect for all of the stock
splits.

RECOGNITION OF REVENUE

    The Company recognizes revenue on telecommunications services ratably over
the term of the applicable lease agreements with customers. Amounts billed in
advance of the service provided are recorded as deferred revenue. In addition,
the Company occasionally enters into sales-type leases for portions of its
network. For those leases entered into prior to completion of the portion of the
network and under contracts entered into before June 30, 1999, the Company
recognizes revenue using the percentage of completion method.

    Under the percentage of completion method, progress is generally measured on
performance milestones relating to the contract where such milestones fairly
reflect the progress toward contract completion. Network construction costs
include all direct material and labor costs and those indirect costs related to
contract performance. General and administrative costs are charged to expense as
incurred. If necessary, the estimated loss on an uncompleted contract is
expensed in the period in which it is identified. Contract costs are estimated
using allocations of the total cost of constructing the specific phase of the
network. Revisions to estimated profits on contracts are recognized in the
period that they become known.

    For sales-type leases for portions of its network entered into prior to the
completion of the portion of the network and after June 30, 1999, the Company
follows the aforementioned FIN 43 real estate accounting rules. Although there
was no change to the economics of the contracts or the timing of the cash to be
received by the Company, the impact of the change in accounting resulted in the
Company recording $10.7 million in revenues for the quarter ended September 30,
1999 rather than the $32.7 million amount that would have been recorded if this
change had not been imposed.

    The Company also provides installation services for its customers, and as
these services typically are completed within a short time period, the Company
records the revenues and related costs for these services under the completed
contract method.

FOREIGN CURRENCY TRANSLATION

    For translation of the financial statements of its recently formed German
operations, the Company has determined that the local currency is the functional
currency. Assets and liabilities of foreign operations are translated at the
period-end exchange rates and income statement items are translated at average
exchange rates for the period. The resulting adjustments are made directly to
the Cumulative Translation Adjustment component of Stockholders' Equity. Foreign
currency transactions are recorded at the exchange rate prevailing on the
transaction date.

MARKETABLE SECURITIES

    For purposes of the consolidated financial statements, the Company considers
all highly liquid investments with a maturity of greater than three months from
the financial statement date to be marketable securities.

                                      F-29
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
COMPREHENSIVE INCOME (LOSS)

    In 1998, the Company adopted Statement of Financial Accounting Standards No.
130 ("SFAS 130") Reporting Comprehensive Income (Loss). This statement
establishes rules for the reporting of comprehensive income and its components.
Comprehensive income (loss) consists of net income (loss) and foreign currency
translation adjustments. The comprehensive loss for the three and nine months
ended September 30, 1999 was $28.2 million and $45.4 million, respectively,
compared with comprehensive income of $3.1 million and $1.1 million,
respectively, for the comparable periods in 1998.

2. FIBER OPTIC TRANSMISSION NETWORK AND RELATED EQUIPMENT

    Fiber optic transmission network and related equipment consist of the
following (in 000's):

<TABLE>
<CAPTION>
                                                              SEPTEMBER 30,
                                                                  1999
                                                              -------------
<S>                                                           <C>
Material-fiber optic cable..................................    $ 91,563
Engineering and layout costs................................       7,338
Fiber optic cable installation costs........................     100,285
Telecommunications equipment and other......................      59,638
Construction in progress....................................     315,519
                                                                --------
                                                                 574,343
Less: accumulated depreciation..............................     (16,681)
                                                                --------
                                                                 557,662
                                                                ========
</TABLE>

    Construction in progress includes amounts incurred in the Company's
expansion of its network or build-out of its facilities. These amounts include
fiber optic cable and other materials, engineering and other layout costs, fiber
optic cable installation costs and other network assets held under capital
leases. Construction in progress also includes payments for rights of way for
the underlying sections of the network build.

3. INVESTMENT IN/ADVANCES TO JOINT VENTURES

    The Company has a joint venture agreement with Racal Telecommunications,
Inc. ("Racal") that provides broad-based transatlantic communication services
between New York and London. During 1998, each party made capital contributions
of $4.3 million. The Company and Racal may each be required to contribute
additional capital as needed for their respective 50% interests. The Company
accounts for its investment using the equity method. For the three and nine
months ended September 30, 1999, the Company recorded a loss of $82,000 and a
loss of $475,000, respectively, from the joint venture based on its 50% interest
in the joint venture compared with losses of $13,000 and $264,000, respectively,
for the comparable periods in 1998.

    In March 1999, as part of its international expansion strategy, the
Company's AboveNet subsidiary entered into agreements to form joint ventures in
Austria, Germany ("AboveNet GmbH"), and the United Kingdom to provide managed
co-location and Internet connectivity solution for mission critical Internet
operations. The Company has invested a total of $5.5 million, which is included
in deposits and other assets

                                      F-30
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

3. INVESTMENT IN/ADVANCES TO JOINT VENTURES (CONTINUED)
at September 30, 1999. In addition, the Company has agreed to provide $2.0
million of additional financing to these joint ventures and, if required, up to
$2.0 million in a convertible loan note(s).

    For an initial equity contribution of $1.9 million, the Company will own 45%
of a joint venture in Germany, Carrierhaus GmbH. AboveNet GmbH will own 5% of
the joint venture. Carrierhaus GmbH will own and operate buildings in Frankfurt,
Germany. For an equity contribution of $22.5 million, the Company will own
87.42% of a second joint venture, Worldswitch GmbH, which will lease facilities
from Carrierhaus GmbH. Worldswitch GmbH will complete improvements to the
buildings, including build-out of co-location facilities, and lease managed
co-location space to AboveNet GmbH and other third parties. Approximately $7.5
million was paid as an initial equity contribution with the remainder of the
$22.5 million to be contributed over the following 14 to 20 months. These
AboveNet joint ventures are accounted for using the equity method.

4. ACQUISITIONS

    On September 8, 1999, the Company acquired all of the outstanding common
stock of AboveNet for a total purchase price, paid in Company class A common
stock, of approximately $1.9 billion. The holders of AboveNet common stock,
stock options and warrants received 1.175 shares of the Company's class A common
stock, stock options and warrants, respectively. AboveNet has its primary
operations in San Jose, California and is a leading provider of
facilities-based, managed services for customer-owned Web servers and related
equipment, known as co-location, and high performance Internet connectivity
solutions for electronic commerce and other business critical Internet
operations. The acquisition has been accounted for by the purchase method and,
accordingly, the results of operations of AboveNet have been included in the
Company's consolidated financial statements from September 9, 1999. The purchase
price has been preliminarily allocated based on estimated fair values as of the
date of acquisition pending final determination of certain tangible and
intangible assets. In addition, in connection with the acquisition, the Company
issued a letter of credit, secured by the Company's restricted cash in the
amount of $25 million, to further secure a credit facility of AboveNet.

    On March 11, 1999, the Company acquired all the outstanding common stock of
Communication Systems Development, Inc. ("CSD") for $25 million in cash. CSD has
its primary operations in Dallas, Texas and is engaged in the engineering and
construction of fiber optic networks. The acquisition has been accounted for by
the purchase method and, accordingly, the results of operations of CSD have been
included in the Company's consolidated financial statements from March 11, 1999.
The purchase price has been preliminarily allocated based on estimated fair
values as of the date of acquisition pending final determination of certain
tangible and intangible assets.

    On June 21, 1999, AboveNet acquired certain assets and assumed certain
liabilities of the Palo Alto Internet Exchange ("PAIX") from Compaq Computer
Corporation ("Compaq") for a total purchase price of $76.4 million consisting of
$70 million in cash, certain future ongoing services to be provided by AboveNet
to Compaq, with a value estimated to be $5.0 million, and acquisition related
costs of $1.4 million. PAIX is a high-level switching and peering point for
global and Internet service providers and content providers. The acquisition has
been recorded using the purchase method of accounting.

    The following unaudited pro forma financial information presents the
combined results of operations of the Company and the above acquisitions as if
the acquisitions had occurred as of the beginning of 1999 and 1998, after giving
effect to certain adjustments, including amortization of goodwill, additional

                                      F-31
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

4. ACQUISITIONS (CONTINUED)
depreciation expense and related income tax effects. The pro forma financial
information does not necessarily reflect the results of operations that would
have occurred had the entities constituted a single entity during such periods.
The amounts are presented in thousands, except per share amounts.

<TABLE>
<CAPTION>
                                                          NINE MONTHS ENDED
                                                            SEPTEMBER 30,
                                                         --------------------
                                                           1999        1998
                                                         ---------   --------
<S>                                                      <C>         <C>
Revenue................................................  $  70,641   $ 28,339
                                                         =========   ========
Net Income/(Loss)......................................  $(128,204)  $(64,628)
                                                         =========   ========
Income/(Loss) per share, basic.........................  $   (0.56)  $  (0.28)
                                                         =========   ========
</TABLE>

5. GERMAN NETWORK BUILD

    In February 1999, the Company entered into a joint venture with Viatel, Inc.
and Carrier 1 Holdings, Ltd. to jointly build a national fiber optic
telecommunications network in Germany. Upon completion of construction, the
joint venture will be dissolved and the Company will own its own separate German
broadband network. In connection with the terms of this agreement, the Company
made a deposit payment of $4.7 million during the third quarter of 1998. Upon
signing a definitive agreement, the Company provided irrevocable standby letters
of credit in the amount of approximately DM110 million (approximately $63
million) as security for the construction costs of the network, which, in
addition to the deposit payment made, covers the Company's portion of the
estimated construction costs of the network. As of September 30, 1999, the
Company had restricted cash of approximately $38 million to secure the remaining
value of the irrevocable standby letters of credit.

6. RELATED PARTY TRANSACTIONS

    The Company is party to a management agreement under which the Company's
controlling shareholder, Metromedia Company, provides consultation and advisory
services relating to legal matters, insurance, personnel and other corporate
policies, cash management, internal audit and finance, taxes, benefit plans and
other services as are reasonably requested. The management agreement terminates
on December 31 of each year, and is automatically renewed for successive
one-year terms unless either party terminates upon 60 days prior written notice.
The 1998 management fee under the agreement was $500,000 per year, payable
quarterly at a rate of $125,000. The 1999 management fee under the agreement is
$1,000,000 per year, payable quarterly at a rate of $250,000. The Company is
also obligated to reimburse Metromedia Company for all its out-of-pocket costs,
expenses incurred and advances paid by Metromedia Company in connection with the
management agreement.

7. SETTLEMENT AGREEMENT

    In March 1998, the Company entered into a settlement agreement with Howard
Katz, Realprop Capital Corporation and Evelyn Katz, among others, which settled
and resulted in the dismissal of litigation in which the Company was a defendant
in KATZ, ET AL. V. NATIONAL FIBER NETWORK, INC., ET AL., No. 97 Civ. 2764 (JGK).

                                      F-32
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

8. NOTES PAYABLE

    On November 25, 1998, the Company issued and sold $650.0 million of 10%
Senior Notes due November 15, 2008. The net proceeds of the 10% Senior Notes
were approximately $630.0 million, after deducting offering costs, which are
included in other long-term assets. Interest on the 10% Senior Notes is payable
semi-annually in arrears on May 15 and November 15 of each year, commencing May
15, 1999. Approximately $91.5 million of the net proceeds was utilized to
purchase certain pledged securities the proceeds of which, together with
interest earned on such securities, will be used to satisfy the Company's
semi-annual interest obligations through May 15, 2000. The 10% Senior Notes are
subject to redemption at the option of the Company, in whole or in part, at any
time on or after November 15, 2003, at specified redemption prices. In addition,
prior to November 15, 2001, the Company may use the net cash proceeds from
certain specified equity transactions to redeem up to 35% of the 10% Senior
Notes at specified redemption prices.

    The indenture pursuant to which the 10% Senior Notes are issued contains
certain covenants that, among other matters, limit the ability of the Company
and its subsidiaries to incur additional indebtedness, issue stock in
subsidiaries, pay dividends or make other distributions, repurchase equity
interests or subordinated indebtedness, engage in sale and leaseback
transactions, create liens, enter into transactions with affiliates, sell
assets, and enter into mergers and consolidations.

    In the event of a change in control of the Company as defined in the
indentures, holders of the 10% Senior Notes will have the right to require the
Company to purchase their Notes, in whole or in part, at a price equal to 101%
of the stated principal amount thereof, plus accrued and unpaid interest, if
any, thereon to the date of purchase. The 10% Senior Notes are senior unsecured
obligations of the Company, and are subordinated to all current and future
indebtedness of the Company's subsidiaries, including trade payables.

    The Company made an interest payment on May 15, 1999. As a result, the value
of pledged securities to satisfy the Company's semi-annual interest obligation
through May 15, 2000 was reduced to approximately $64 million.

9. EQUITY TRANSACTIONS

AUTHORIZED CAPITAL

    On May 18, 1999, the stockholders of the Company approved an amendment to
its Certificate of Incorporation to increase the authorized number of shares of
its capital stock to 2,946,286,022 shares consisting of (a) 2,404,031,240 shares
of class A common stock, (b) 522,254,782 shares of class B common stock, and (c)
20,000,000 shares of preferred stock.

STOCK SPLITS

    As discussed in Note 1, on August 28, 1998, December 22, 1998 and May 19,
1999 the Company completed two-for-one stock splits of the Company's class A and
class B common stock in the form of 100 percent stock dividends to all
stockholders of record as of certain specified dates. The accompanying financial
statements give retroactive effect to the stock dividends.

    As of September 30, 1999, adjusted for the effect of the stock dividends,
the Company had 198,822,053 class A common shares outstanding and 33,769,272
class B common shares outstanding.

                                      F-33
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

9. EQUITY TRANSACTIONS (CONTINUED)
STOCK WARRANTS

    (a) On December 13, 1996, the Company issued and sold to a private investor,
for an aggregate cash consideration of $2,025,000, (i) 1,200,000 shares of 10%
cumulative convertible preferred stock (the "Series A preferred stock") bearing
dividends at a rate of $.17 per share per annum, (ii) warrants to purchase
912,600 shares of class A common stock at an exercise price of $.62 per share
and (iii) a contingent stock subscription warrant to purchase a number of shares
of class A common stock (such number to be determined based on certain future
events) at an exercise price of $0.01 per share. In connection with the
investment in the Company by Metromedia Company, the private investor allowed
the Series A preferred stock and the contingent warrants to be redeemed at an
aggregate redemption price of $2,115,000 (which includes accrued but unpaid
dividends on the Series A preferred stock) and the number of shares underlying
the private investor's warrants to be increased from 912,600 to 1,825,200. In
January 1998, the private investor made a cashless exercise of all its warrants
and the number of its shares issuable upon exercise was reduced by the number of
shares at the closing on the day of exercise having a value equal to the
aggregate exercise price. Accordingly, the Company issued the private investor
1,382,120 shares of class A common stock for all its warrants.

    (b) In April 1995, the Company entered into a loan agreement with a customer
for $500,000 bearing interest at 11% per annum. In July 1997, the note was
repaid in full. In connection with this loan, the Company issued the customer a
warrant entitling the holder to purchase a total of 5,353,336 shares of the
Company's common stock. In February 1997, this warrant was exchanged for a new
warrant to purchase 3,650,400 shares of the Company's common stock at $0.60 per
share. In February 1999, in accordance with an anti-dilution provision in the
warrant, the Company increased the warrant to include the right to purchase an
additional 331,882 shares of the Company's class A common stock at $0.56 per
share and repriced the existing warrant to the same $0.56 per share. As of
March 31, 1999, none of the warrants have been exercised. The warrant expires on
February 13, 2000.

ABOVENET TRANSACTION

    On September 8, 1999, the Company completed its acquisition of AboveNet for
an aggregate consideration of approximately $1.9 billion. In connection with the
acquisition, the company issued (i) 41,652,675 shares of its class A common
stock at an exchange ratio of 1.175 shares of the Company's common stock for
each share of AboveNet common stock; (ii) 5,355,723 options to purchase the
Company's class A common stock at an average exercise price of $19.23; and
417,163 warrants to purchase the Company's class A common stock at an average
exercise price of $7.75.

10. CONTINGENCIES

    On or about October 20, 1997, Vento & Company of New York, LLC commenced an
action against the Company, Stephen A. Garofalo, Peter Silverman, the law firm
of Silverman, Collura, Chernis & Balzano, P.C., Peter Sahagen, Sahagen
Consulting Group of Florida, Robert Kramer, Birdie Capital Corp., Lawrence
Black, Sterling Capital LLC, Penrush Limited, Needham Capital Group, Arthur
Asch, Michael Asch and Ronald Kuzon in the United States District Court for the
Southern District of New York, No. 97 CIV 7751(JGK). On or about May 29, 1998,
Vento & Company filed an amended complaint. On or about July 1, 1999, Vento &
Company filed a second amended complaint. In its complaint, as amended, Vento &
Company alleges seven causes of action in connection with its sale of 900,000
shares, not adjusted for subsequent stock splits, of the Company's class A
common stock to Mr. Sahagen and some of the

                                      F-34
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

10. CONTINGENCIES (CONTINUED)
defendants on January 13, 1997. These seven causes of action include:
(i) violation of Section 10(b) of the Securities Exchange Act of 1934 and
Rule 10b-5 promulgated under such Act; (ii) fraud and fraudulent concealment;
(iii) breach of fiduciary duty (but not against the Company); (iv) negligent
misrepresentation and omission; and (v) breach of contract. Vento & Company is
seeking, among other things, recission of the Vento & Company sale, or
alternatively, damages in an amount not currently ascertainable but Vento &
Company contends to be in excess of $460 million, together with interest
thereon. Vento & Company is also seeking unspecified punitive damages,
reasonable legal fees and the costs of this action. All the defendants,
including the Company and its Chairman, have moved for summary judgment of Vento
& Company's second amended complaint.

    On or about June 12, 1998, Claudio E. Contardi commenced an action against
Peter Sahagen, Sahagen Consulting Group of Florida and the Company in the United
States District Court for the Southern District of New York, No. 98 CIV
4140(JGK). Mr. Contardi alleges a cause of action for, among other things,
breach of a finder's fee agreement entered into between Mr. Sahagen and Mr.
Contardi on or about November 14, 1996 and breach of an implied covenant of good
faith and fair dealing contained in the finder's fee agreement. Mr. Contardi is
seeking, among other things, a number of our shares of class A common stock
which we cannot currently ascertain but believe to be approximately 112,500
shares (calculated as of the date on which the complaint was filed without
taking into account subsequent stock splits) or damages in an amount which we
cannot currently ascertain but believe to be approximately $4.9 million
(calculated as of the date on which the complaint was filed) and all costs and
expenses incurred by him in this action. The Company has filed an answer to the
complaint and has raised affirmative defenses. The Company has moved for summary
judgement on the complaint.

    The Company intends to vigorously defend both these actions because the
Company believes that it acted appropriately in connection with the matters at
issue in these two cases. However, the Company cannot assure you that it will
not determine that the advantages of entering into a settlement outweigh the
risk and expense of protracted litigation or that ultimately the Company will be
successful in defending against these allegations. If the Company is
unsuccessful in defending against these allegations, an award of the magnitude
being sought in the Vento & Company litigation would have a material adverse
effect on our financial condition and results of operations.

    On June 29, 1999, an alleged stockholder of AboveNet filed a lawsuit,
captioned KAUFMAN V. TUAN, et al, Del. Ch. C.A. No. 17259NC, in the Court of
Chancery of the State of Delaware in and for the New Castle County. The
plaintiff, who purports to represent a class of all AboveNet stockholders,
challenges the terms of the proposed merger between the Company and AboveNet.
The complaint names, as defendants, AboveNet, the directors of AboveNet, and the
Company (as an aider and abettor). The complaint alleges generally that
AboveNet's directors breached their fiduciary duty to stockholders of AboveNet,
and seeks an injunction against the merger, or, in the alternative, rescission
and the recovery of unspecified damages, fees and expenses. AboveNet, the
Company and the individual defendants believe the lawsuit is without merit and
intend to defend themselves vigorously. AboveNet and the individual director
defendants' responses were filed on July 22, 1999. In connection with these
responses, a motion to dismiss the complaint in its entirety and a motion to
stay discovery pending the outcome of the motion to dismiss were filed by the
AboveNet and the individual directors of AboveNet on July 22, 1999. Similar
motions to dismiss the complaint and stay discovery were filed by the Company on
July 26, 1999.

    Four other complaints, which are virtually identical to the complaint in
KAUFMAN V. TUAN, have also been filed in the Delaware Court of the Chancery.
None of these four complaints have been served. The

                                      F-35
<PAGE>
                 METROMEDIA FIBER NETWORK, INC. & SUBSIDIARIES

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

10. CONTINGENCIES (CONTINUED)
four actions are captioned BROSIOUS V. TUAN, et al, Del. Ch. C.A. No. 17271NC,
CHONG V. TUAN, et al, Del. Ch. C.A. No. 17281NC, EHLERT V. TUAN, et al, Del. Ch.
C.A. No. 17284NC, HORN V. TUAN, et al, Del. Ch. C.A. No. 17300NC.

    In addition, the Company is subject to various claims and proceedings in the
ordinary course of business. Based on information currently available, the
Company believes that none of such current claims, or proceedings, individually,
or in the aggregate, including the Vento & Company litigation and the Contardi
litigation, will have a material adverse effect on our financial condition or
results of operations, although the Company can make no assurances in this
regard.

11. SUBSEQUENT EVENT

    On October 7, 1999, the Company entered into a securities purchase agreement
with Bell Atlantic, under which Bell Atlantic would purchase up to approximately
25.6 million newly issued shares of the Company's class A common stock at a
purchase price of $28.00 per share and a convertible subordinated note of
approximately $975.3 million, which is convertible into shares of its class A
common stock at a conversion price of $34.00 per share. The Company expects this
transaction, which is subject to customary closing conditions, to be completed
by the end of the first quarter of 2000. Assuming the issuance of the 25.6
million shares of class A common stock and conversion of the convertible
subordinated note, this investment would represent 19.9% of the Company's
outstanding shares. Bell Atlantic has also agreed to pay the Company $550
million over the next three years in exchange for delivery of fiber optic
facilities over the next five years. The proceeds from these two transactions
will be used to fund the expansion of its network.

                                      F-36
<PAGE>
                          INDEPENDENT AUDITORS' REPORT

To the Board of Directors and Stockholders of
  AboveNet Communications Inc.:

We have audited the accompanying consolidated balance sheets of AboveNet
Communications Inc. as of June 30, 1998 and 1999 and the related consolidated
statements of operations, stockholders' equity and cash flows for each of the
three years in the period ended June 30, 1999. These financial statements are
the responsibility of the Company's management. Our responsibility is to express
an opinion on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all
material respects, the financial position of AboveNet Communications Inc. as of
June 30, 1998 and 1999 and the results of its operations and its cash flows for
each of the three years in the period ended June 30, 1999 in conformity with
generally accepted accounting principles.

DELOITTE & TOUCHE LLP
San Jose, California

July 28, 1999
(September 8, 1999 as to Note 17)

                                      F-37
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

                          CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                       JUNE 30,
                                                              --------------------------
                                                                 1998           1999
                                                              -----------   ------------
<S>                                                           <C>           <C>
                                         ASSETS
Current assets:
  Cash and equivalents......................................  $ 8,141,200   $209,126,300
  Short-term investments....................................           --     11,744,200
  Accounts receivable, net of reserve for doubtful accounts
    of $60,000 and $388,300, respectively...................      357,000      3,355,000
  Prepaid expenses and other current assets.................      269,600      3,850,400
                                                              -----------   ------------
      Total current assets..................................    8,767,800    228,075,900
Property and equipment, net.................................    4,436,100     46,590,900
Rights to use fiber optic capacity..........................           --     12,904,500
Intangible assets...........................................           --     69,474,100
Restricted cash.............................................      300,000     21,475,900
Deposits and other assets...................................      189,400      5,377,400
                                                              -----------   ------------
Total assets................................................  $13,693,300   $383,898,700
                                                              ===========   ============

                          LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable..........................................  $ 2,301,300   $ 13,593,300
  Remaining obligation for rights to use fiber optic
    capacity................................................           --        800,000
  Accrued liabilities.......................................      619,900      1,322,600
  Unearned revenue..........................................      309,400      2,510,700
  Current portion of long-term obligations..................      476,000      5,984,800
                                                              -----------   ------------
      Total current liabilities.............................    3,706,600     24,211,400
Convertible notes payable and advances......................    8,000,000             --
Unearned revenue............................................           --      4,375,000
Other long-term obligations.................................    1,325,300     21,588,600
Commitments and contingencies (Notes 4, 5 and 12)
Stockholders' equity:
  Preferred stock, $0.001 par value, 10,000,000 shares
    authorized;
    shares issued and outstanding--none.....................           --             --
  Convertible preferred stock, $0.001 par value:
    Series A; shares issued and outstanding: 2,050,000 and
      none, respectively....................................      410,000             --
    Series B; shares issued and outstanding: 3,263,792 and
      none, respectively....................................    2,323,100             --
    Series C; shares issued and outstanding: 4,006,000 and
      none, respectively....................................    3,873,400             --
    Series D; no shares issued and outstanding..............           --             --
    Series E; no shares issued and outstanding..............           --             --
  Common stock, $0.001 par value, 60,000,000 shares
    authorized; shares issued and outstanding: 728,696 and
    34,548,308, respectively................................       38,900    363,218,000
  Common stock options......................................    1,861,500      4,413,800
  Deferred stock compensation...............................     (540,100)       (47,800)
  Accumulated deficit.......................................   (7,305,400)   (33,860,300)
                                                              -----------   ------------
      Total stockholders' equity............................      661,400    333,723,700
                                                              -----------   ------------
Total liabilities and stockholders' equity..................  $13,693,300   $383,898,700
                                                              ===========   ============
</TABLE>

                See notes to consolidated financial statements.

                                      F-38
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

                     CONSOLIDATED STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                                  YEARS ENDED JUNE 30,
                                                        ----------------------------------------
                                                           1997          1998           1999
                                                        -----------   -----------   ------------
<S>                                                     <C>           <C>           <C>
Revenues..............................................  $   551,600   $ 3,436,400   $ 13,967,800
                                                        -----------   -----------   ------------
Costs and expenses:
  Data communications and telecommunications..........      558,600     2,199,800     12,649,700
  Network operations..................................      416,700     1,571,800      6,084,300
  Sales and marketing.................................      382,600     1,618,700     11,251,300
  General and administrative..........................      433,700     1,621,500      6,610,900
  Depreciation and amortization.......................      132,700       475,500      3,412,600
  Stock-based compensation expense....................           --     1,276,400      1,688,700
  Joint venture termination fee.......................      431,100            --             --
                                                        -----------   -----------   ------------
    Total costs and expenses..........................    2,355,400     8,763,700     41,697,500
Loss from operations..................................   (1,803,800)   (5,327,300)   (27,729,700)
Interest expense......................................       (7,400)     (160,800)    (1,573,100)
Interest and other income.............................        8,400        63,100      2,947,900
                                                        -----------   -----------   ------------
Loss before equity interest in affiliates.............   (1,802,800)   (5,425,000)   (26,354,900)
Equity interest in losses of affiliates...............           --            --       (200,000)
                                                        -----------   -----------   ------------
Net loss..............................................  $(1,802,800)  $(5,425,000)  $(26,554,900)
                                                        ===========   ===========   ============
Basic and diluted loss per share......................  $     (4.58)  $    (10.34)  $      (1.60)
                                                        ===========   ===========   ============
Shares used in basic and diluted loss per share.......      393,236       524,608     16,643,027
                                                        ===========   ===========   ============
</TABLE>

                See notes to consolidated financial statements.

                                      F-39
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999
<TABLE>
<CAPTION>
                                       PREFERRED STOCK               COMMON STOCK            COMMON       DEFERRED
                                  --------------------------   -------------------------     STOCK         STOCK       ACCUMULATED
                                    SHARES         AMOUNT        SHARES        AMOUNT       OPTIONS     COMPENSATION     DEFICIT
                                  -----------   ------------   ----------   ------------   ----------   ------------   ------------
<S>                               <C>           <C>            <C>          <C>            <C>          <C>            <C>
BALANCES, July 1, 1996..........           --   $         --      250,000   $      5,000   $       --   $        --    $    (77,600)
Issuance of common stock........                                  125,000          2,500
Issuance of Series A convertible
  preferred stock...............    2,050,000        410,000
Exercise of common stock
  options.......................                                   31,250            600
Issuance of Series B convertible
  preferred stock...............    1,000,000        600,000
Issuance of Series B convertible
  preferred stock in conjunction
  with acquisition of DSK, Inc.
  (Note 11).....................    1,000,000        600,000
Net loss........................                                                                                         (1,802,800)
                                  -----------   ------------   ----------   ------------   ----------   -----------    ------------
BALANCES, June 30, 1997.........    4,050,000      1,610,000      406,250          8,100           --            --      (1,880,400)
Exercise of common stock
  options.......................                                  322,446         30,800
Issuance of warrants in
  connection with issuance of
  debt..........................                     112,000                                   45,000
Issuance of Series B convertible
  preferred stock...............    1,263,792      1,011,100
Issuance of Series C convertible
  preferred stock...............    4,006,000      3,873,400
Compensatory stock
  arrangements..................                                                            1,816,500    (1,816,500)
Amortization of deferred stock
  compensation..................                                                                          1,276,400
Net loss........................                                                                                         (5,425,000)
                                  -----------   ------------   ----------   ------------   ----------   -----------    ------------
BALANCES, June 30, 1998.........    9,319,792      6,606,500      728,696         38,900    1,861,500      (540,100)     (7,305,400)
Issuance of Series D convertible
  preferred stock...............    4,230,756     10,771,000
Issuance of Series E convertible
  preferred stock...............      817,550      3,846,400
Exercise of Series B warrants...      209,400             --
Conversion of convertible
  preferred stock to common
  stock.........................  (14,577,498)   (21,223,900)  14,577,498     21,223,900
Issuance of common stock upon
  initial public offering.......                               11,500,000     67,822,000
Issuance of common stock upon
  public offering...............                                6,850,356    273,421,500
Exercise of common stock options
  and warrants..................                                  842,440        439,200
Issuance of common stock under
  employee stock purchase
  plan..........................                                   49,318        272,500
Issuance of warrants in
  connection with issuance of
  debt and leases...............                                                            1,355,900
Compensatory stock
  arrangements..................                                                            1,196,400    (1,196,400)
Amortization of deferred stock
  compensation..................                                                                          1,688,700
Net loss........................                                                                                        (26,554,900)
                                  -----------   ------------   ----------   ------------   ----------   -----------    ------------
BALANCES, June 30, 1999.........           --   $         --   34,548,308   $363,218,000   $4,413,800   $   (47,800)   $(33,860,300)
                                  ===========   ============   ==========   ============   ==========   ===========    ============

<CAPTION>

                                  SHAREHOLDERS'
                                     EQUITY
                                  -------------
<S>                               <C>
BALANCES, July 1, 1996..........  $    (72,600)
Issuance of common stock........         2,500
Issuance of Series A convertible
  preferred stock...............       410,000
Exercise of common stock
  options.......................           600
Issuance of Series B convertible
  preferred stock...............       600,000
Issuance of Series B convertible
  preferred stock in conjunction
  with acquisition of DSK, Inc.
  (Note 11).....................       600,000
Net loss........................    (1,802,800)
                                  ------------
BALANCES, June 30, 1997.........      (262,300)
Exercise of common stock
  options.......................        30,800
Issuance of warrants in
  connection with issuance of
  debt..........................       157,000
Issuance of Series B convertible
  preferred stock...............     1,011,100
Issuance of Series C convertible
  preferred stock...............     3,873,400
Compensatory stock
  arrangements..................            --
Amortization of deferred stock
  compensation..................     1,276,400
Net loss........................    (5,425,000)
                                  ------------
BALANCES, June 30, 1998.........       661,400
Issuance of Series D convertible
  preferred stock...............    10,771,000
Issuance of Series E convertible
  preferred stock...............     3,846,400
Exercise of Series B warrants...            --
Conversion of convertible
  preferred stock to common
  stock.........................            --
Issuance of common stock upon
  initial public offering.......    67,822,000
Issuance of common stock upon
  public offering...............   273,421,500
Exercise of common stock options
  and warrants..................       439,200
Issuance of common stock under
  employee stock purchase
  plan..........................       272,500
Issuance of warrants in
  connection with issuance of
  debt and leases...............     1,355,900
Compensatory stock
  arrangements..................            --
Amortization of deferred stock
  compensation..................     1,688,700
Net loss........................   (26,554,900)
                                  ------------
BALANCES, June 30, 1999.........  $333,723,700
                                  ============
</TABLE>

                See notes to consolidated financial statements.

                                      F-40
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                        YEARS ENDED JUNE 30,
                                                              ----------------------------------------
                                                                 1997          1998           1999
                                                              -----------   -----------   ------------
<S>                                                           <C>           <C>           <C>
Cash flows from operating activities:
  Net loss..................................................  $(1,802,800)  $(5,425,000)  $(26,554,900)
  Adjustments to reconcile net loss to net cash used in
    operating activities:
    Equity interest in losses of affiliates.................           --            --        200,000
    Depreciation and amortization...........................      132,700       475,500      3,412,600
    Stock-based compensation expense........................           --     1,276,400      1,688,700
    Noncash interest expense................................           --       133,200        117,000
    Joint venture termination fee...........................      431,100            --             --
    Changes in assets and liabilities:
      Accounts receivable...................................      (29,100)     (315,900)    (2,728,000)
      Prepaid expenses and other current assets.............           --      (269,600)    (3,577,800)
      Restricted cash.......................................           --      (300,000)   (21,175,900)
      Accounts payable......................................      298,900     1,989,300     11,292,000
      Accrued liabilities...................................      109,700       510,200        702,700
      Unearned revenue......................................       85,000       224,400      1,313,300
      Deferred rent.........................................       30,400        18,200        156,100
                                                              -----------   -----------   ------------
        Net cash used in operating activities...............     (744,100)   (1,683,300)   (35,154,200)
                                                              -----------   -----------   ------------
Cash flows from investing activities:
  Purchase of short-term investments........................           --            --    (11,744,200)
  Cash paid for rights to use fiber optic capacity..........           --            --     (7,480,000)
  Purchase of property and equipment........................     (474,500)   (3,666,000)   (37,426,300)
  Increase in deposits and other assets.....................      (32,700)     (111,700)    (1,519,000)
  Investments in affiliates.................................           --            --     (2,630,100)
  Cash paid for acquisition.................................           --            --    (71,420,200)
                                                              -----------   -----------   ------------
        Net cash used in investing activities...............     (507,200)   (3,777,700)  (132,219,800)
                                                              -----------   -----------   ------------
Cash flows from financing activities:
  Proceeds from notes payable and advances..................      739,900    13,395,000     23,722,300
  Debt repayments...........................................           --       (70,000)    (3,297,100)
  Capital lease repayments..................................      (49,600)      (84,700)      (638,700)
  Proceeds from issuance of common stock....................        3,100        30,800    341,955,200
  Proceeds from issuance of convertible preferred stock.....      800,000            --      6,617,400
                                                              -----------   -----------   ------------
        Net cash provided by financing activities...........    1,493,400    13,271,100    368,359,100
                                                              -----------   -----------   ------------
Net increase in cash and equivalents........................      242,100     7,810,100    200,985,100
Cash and equivalents, beginning of period...................       89,000       331,100      8,141,200
                                                              -----------   -----------   ------------
Cash and equivalents, end of period.........................  $   331,100   $ 8,141,200   $209,126,300
                                                              ===========   ===========   ============
Supplemental cash flow information--cash paid for
  interest..................................................  $     7,400   $    27,600   $  1,456,100
                                                              ===========   ===========   ============
Noncash investing and financing activities:
  Remaining obligation for rights to use fiber optic
    capacity................................................  $        --   $        --   $    800,000
                                                              ===========   ===========   ============
  Acquisition of equipment under capital lease..............  $   206,200   $   479,200   $  5,829,500
                                                              ===========   ===========   ============
  Acquisition of leasehold improvements in conjunction with
    DSK, Inc. acquisition...................................  $   168,900   $        --   $         --
                                                              ===========   ===========   ============
  Exchange of notes, advances, accrued interest and warrants
    for convertible preferred stock.........................  $   210,000   $ 4,884,500   $  8,000,000
                                                              ===========   ===========   ============
  Conversion of preferred stock into common stock...........  $        --   $        --   $ 21,223,900
                                                              ===========   ===========   ============
  Issuance of warrants in connection with issuance of debt
    and leases..............................................  $        --   $    45,000   $  1,355,900
                                                              ===========   ===========   ============
</TABLE>

                See notes to consolidated financial statements.

                                      F-41
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    ORGANIZATION--AboveNet Communications Inc. (the "Company"), was formed on
March 8, 1996 (inception). The Company provides facilities-based, managed
services for customer-owned Web servers and related equipment, known as
co-location, and high performance Internet connectivity solutions for electronic
commerce and other business critical Internet operations.

    PRINCIPLES OF CONSOLIDATION--The consolidated financial statements include
the Company and its subsidiaries. All significant intercompany transactions and
amounts are eliminated in consolidation. Minority investments in joint ventures
are accounted for under the equity method of accounting, under which the Company
records in income its proportionate share of the earnings or losses of the joint
ventures.

    USE OF ESTIMATES--The preparation of financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.

    CONCENTRATION OF CREDIT RISK--Financial instruments that potentially subject
the Company to concentration of credit risk consist of trade receivables.
However, the Company's credit risk is mitigated by its credit evaluation process
and the reasonably short collection terms. The Company does not require
collateral or other security to support accounts receivable and maintains
reserves for potential credit losses.

    CASH AND EQUIVALENTS--The Company considers all highly liquid investments
with maturities of ninety days or less when purchased by the Company to be cash
equivalents.

    SHORT-TERM INVESTMENTS--Short term investments consist of treasury bills
with a maturity greater than 90 days but less than twelve months. The Company's
short-term investments are classified as available-for-sale. The investments are
carried at cost, which approximated fair value at June 30, 1999. Material
unrealized gains or losses would be reported as a separate component of
stockholders' equity. No investments were sold in the periods presented.

    PROPERTY AND EQUIPMENT--Property and equipment are stated at cost.
Depreciation is computed using the straight-line method over the estimated
useful lives of three to five years. Leasehold improvements and assets acquired
under capital lease are amortized over the shorter of the lease term or the
useful lives of the improvement.

    RIGHTS TO USE FIBER OPTIC CAPACITY--Indefeasible rights to use (IRU)
capacity on fiber optic cable systems are stated at cost. Amortization will be
recognized over the shorter of the term of the IRU or its useful life beginning
when such capacity becomes available to the Company.

    INTANGIBLE ASSETS--Goodwill is amortized on a straight-line basis over its
estimated life of ten years.

    RESTRICTED CASH--Restricted cash consists of certificates of deposit which
are restricted from use pursuant to certain lease agreements.

    REVENUE RECOGNITION--Revenue consists primarily of service revenue which is
recognized in the period in which the services are provided. The services
primarily include bandwidth and space requirement charges which are recognized
monthly as well as installation fees which are recognized as revenue in the

                                      F-42
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

period of installation. Unearned revenue consists of customer advances and the
value assigned to certain ongoing services to be rendered to Compaq Computer
Corporation in connection with the acquisition of the Palo Alto Internet
Exchange ("PAIX") (see Note 2). Unearned revenue is recognized in the period in
which the services are rendered.

    INCOME TAXES--Deferred tax liabilities are recognized for future taxable
amounts, and deferred tax assets are recognized for future deductions, net of a
valuation allowance to reduce net deferred tax assets to amounts that are more
likely than not to be realized.

    STOCK-BASED COMPENSATION--The Company accounts for stock-based awards to
employees using the intrinsic value method in accordance with Accounting
Principles Board (APB) Opinion No. 25, ACCOUNTING FOR STOCK ISSUED TO EMPLOYEES.

    IMPAIRMENT OF LONG-LIVED ASSETS AND LONG-LIVED ASSETS TO BE DISPOSED OF--The
Company evaluates its long-lived assets and certain identifiable intangibles for
impairment whenever events or changes in circumstances indicate that the
carrying amount of such assets or intangibles may not be recoverable.
Recoverability of assets to be held and used is measured by a comparison of the
carrying amount of an asset to future net cash flows expected to be generated by
the asset. If such assets are considered to be impaired, the impairment to be
recognized is measured by the amount by which the carrying amount of the assets
exceeds the fair value of the assets. Assets to be disposed of are reported at
the lower of the carrying amount or fair value less costs to sell.

    NET INCOME (LOSS) PER SHARE--Basic income (loss) per share excludes dilution
and is computed by dividing net income (loss) by the weighted-average number of
common shares outstanding, less shares subject to repurchase by the Company, for
the period. Diluted income (loss) per share reflects the potential dilution that
could occur if securities or other contracts to issue common stock were
exercised or converted into common stock. Common share equivalents are excluded
from the computation in loss periods as their effect would be antidilutive.

    RECLASSIFICATIONS--Certain prior period amounts have been reclassified to
conform to the current period presentation. Such reclassifications had no effect
on stockholders' equity (deficiency) or net loss.

    RECENTLY ISSUED ACCOUNTING STANDARDS--In June 1997, the Financial Accounting
Standards Board (FASB) issued Statement of Financial Accounting Standards (SFAS)
No. 130, REPORTING COMPREHENSIVE INCOME, which requires an enterprise to report,
by major components and as a single total, the change in the Company's net
assets during the period from nonowner sources. The Company adopted SFAS
No. 130 in fiscal 1999. For all periods presented, comprehensive loss was equal
to the Company's net loss.

    Additionally, in June 1997, the FASB issued SFAS No. 131, DISCLOSURES ABOUT
SEGMENTS OF AN ENTERPRISE AND RELATED INFORMATION, which establishes annual and
interim reporting standards for an enterprise's business segments and related
disclosures about the enterprise's products, services, geographic areas and
major customers. The Company adopted this statement in fiscal 1999. The Company
has determined that it operates in one reporting segment.

    In March 1998, the Accounting Standards Executive Committee of the American
Institute of Certified Public Accountants issued SOP 98-1, ACCOUNTING FOR THE
COSTS OF COMPUTER SOFTWARE DEVELOPED OR OBTAINED FOR INTERNAL USE. SOP 98-1
provides guidance for an enterprise on accounting for the costs of computer
software developed or obtained for internal use. SOP 98-1 is effective for the
Company in fiscal 2000. The Company anticipates that accounting for transactions
under SOP 98-1 will not have a material impact on its financial position or
results of operations.

                                      F-43
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

    In June 1998, the FASB issued SFAS No. 133, ACCOUNTING FOR DERIVATIVE
INSTRUMENTS AND HEDGING ACTIVITIES, which defines derivatives, requires that all
derivatives be carried at fair value, and provides for hedge accounting when
certain conditions are met. SFAS No. 133 is effective for the Company in fiscal
2001. Although the Company has not fully assessed the implications of SFAS
No. 133, the Company does not believe adoption of this statement will have a
material impact on its financial position or results of operations.

2. ACQUISITION OF PALO ALTO INTERNET EXCHANGE

    On June 21, 1999, the Company consummated the acquisition of certain assets
and the assumption of certain liabilities of the Palo Alto Internet Exchange
("PAIX"), a business within the Technology and Corporate Development and
Operations Management Services business units of Compaq Computer Corporation
("Compaq"). The total purchase price of $76.4 million consisted of
$70.0 million in cash, certain future ongoing services to be provided by the
Company to Compaq, with a value currently estimated to be $5.0 million, and
acquisition-related costs of $1.4 million. PAIX is a high-level switching and
peering point for global and regional Internet service providers and content
providers.

    The acquisition has been recorded using the purchase method of accounting.
The excess of the aggregate purchase price over the fair market value of net
assets acquired of $69.7 million was recognized as goodwill and is being
amortized over 10 years. Amortization of goodwill for fiscal 1999 was $190,000.
At June 30, 1999, the Company made a preliminary allocation of the purchase
price. The Company will record adjustments to the purchase price allocation as
deemed necessary.

    The operating results of PAIX have been included in the Company's
consolidated financial statements since the date of acquisition. Had the
acquisition of PAIX occurred on July 1, 1997 the unaudited proforma revenue, net
loss applicable to common stockholders and related basic and diluted loss per
share for the years ended June 30, 1998 and 1999 would have been: $6.6 million
and $19.7 million; $23.8 million and $44.4 million, and $45.45 per share and
$2.66 per share, respectively. These results, which are based on various
assumptions, are not necessarily indicative of what would have occurred had the
acquisition been consummated on July 1, 1997.

    A reconciliation of the cash and noncash aspects of the above transaction is
as follows:

<TABLE>
<S>                                                           <C>
Tangible and intangible assets acquired.....................  $76,683,200
Liabilities assumed.........................................     (263,000)
Liabilities incurred in connection with purchase............   (5,000,000)
                                                              -----------
Net cash paid for acquisition...............................  $71,420,200
                                                              ===========
</TABLE>

                                      F-44
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

3. PROPERTY AND EQUIPMENT, NET

    Property and equipment at June 30 are comprised of the following:

<TABLE>
<CAPTION>
                                                         1998         1999
                                                      ----------   -----------
<S>                                                   <C>          <C>
Property and equipment at cost:
  Telecommunication equipment.......................  $2,295,300   $10,255,500
  Leasehold improvements (primarily
    co-location facilities).........................     224,700    20,385,900
  Office equipment..................................     186,500     1,262,000
  Construction in progress..........................   2,389,400    18,224,900
                                                      ----------   -----------
Total...............................................   5,095,900    50,128,300
Less accumulated depreciation and amortization......    (659,800)   (3,537,400)
                                                      ----------   -----------
Property and equipment, net.........................  $4,436,100   $46,590,900
                                                      ==========   ===========
</TABLE>

    Construction in progress primarily relates to costs incurred during the
expansion of the Company's facilities.

4. INDEFEASIBLE RIGHTS TO USE FIBER OPTIC CAPACITY

    During fiscal 1999, the Company entered into a series of agreements
providing for the acquisition of an indefeasible right to use capacity on a
fiber optic cable system between the U.S. and the United Kingdom for
$8.3 million, $7.5 million of which has been paid as of June 30, 1999. The terms
of these agreements are 25 years.

    In fiscal 1999, the Company entered into a series of agreements to lease
fiber optic cable systems between Washington D.C. and New York City. These
leases were initiated in the fourth quarter of fiscal 1999 and require annual
payments of $630,000 for 20 years. The leases are accounted for as capital
leases and had a net book value of $4.6 million at June 30, 1999.

5. JOINT VENTURES

    In March 1999, as part of its international expansion strategy, the Company
entered into agreements to form joint ventures in Austria, Germany ("AboveNet
GmbH"), and the United Kingdom to provide managed co-location and Internet
connectivity solutions for mission critical Internet operations. The Company
invested a total of $2.4 million in fiscal 1999, which is included in deposits
and other assets at June 30, 1999. In addition, the Company has agreed to
provide up to $2 million of additional financing to certain of these joint
ventures, if required, and to arrange or provide for an additional $4.5 million
contingent upon the joint ventures raising an equivalent amount from third
parties. These joint ventures are accounted for under the equity method of
accounting.

    In July 1999, the Company agreed to enter into two additional joint ventures
in Germany. The first joint venture will own real property in Frankfurt,
Germany. For an equity contribution of approximately $2 million, the Company
will own 45% and AboveNet GmbH will own 5% of this joint venture. The second
joint venture will lease the real property from the aforementioned joint
venture. It will complete improvements to the property and will manage the
property. This entity will lease managed co-location space to AboveNet GmbH and
provide leased space to other third parties. The Company will own 87.42% of this
second joint venture in exchange for equity contributions which will total
approximately $23 million,

                                      F-45
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

of which approximately $8 million will be paid as an initial equity
contribution, with the remainder to be contributed over the following 18 to
24 months.

6. CONVERTIBLE NOTES PAYABLE AND ADVANCES

    In June 1997, the Company received $739,900 in cash advances from certain
individuals, including stockholders and employees. In July and August 1997, the
Company received an additional $250,000 in cash advances. In August 1997, the
advances were converted into notes payable of $989,900 and warrants to acquire
989,906 shares of Series B convertible preferred stock at $1.00 per share. The
notes generally bore an annual interest rate of 10%. The related warrants were
valued at $112,000, or $0.12 per share, and were recorded as noncash interest
expense in fiscal 1998.

    On December 31, 1997, the Company entered into exchange agreements with the
note holders. Pursuant to the exchange agreements, the above notes, accrued
interest of $21,200 and the related warrants were exchanged for (i) 1,263,792
shares of Series B convertible preferred stock and (ii) warrants to acquire
247,472 shares of Series B convertible preferred stock at $1.00 per share.

    During fiscal 1998, the Company received $3,873,400 of cash advances from
certain potential investors. In May 1998, these advances were converted into
4,006,000 shares of Series C convertible preferred stock.

    On June 30, 1998, in anticipation of the Company's pending sale of preferred
stock, the Company received $8 million in cash, of which $1 million represented
a noninterest-bearing cash advance and $7 million represented convertible notes
payable. The notes bore interest at 6%, were due on July 15, 1998 and were
convertible into Series D convertible preferred stock at $2.60 per share. On
July 15, 1998, the convertible notes and advance were converted into Series D
convertible preferred stock (see Note 9).

                                      F-46
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

7. OTHER LONG-TERM OBLIGATIONS

    Long-term obligations at June 30 consist of:

<TABLE>
<CAPTION>
                                                         1998         1999
                                                      ----------   -----------
<S>                                                   <C>          <C>
Credit facility.....................................  $1,201,600   $21,626,800
Capital lease facility..............................     551,100     5,741,900
Deferred rent.......................................      48,600       204,700
                                                      ----------   -----------
Total obligations...................................   1,801,300    27,573,400
Less current portion of long-term obligations.......    (476,000)   (5,984,800)
                                                      ----------   -----------
Long-term obligations...............................  $1,325,300   $21,588,600
                                                      ==========   ===========
</TABLE>

CREDIT FACILITY

    At June 30, 1999, the Company had $21.6 million outstanding under its credit
facility (the "Credit Facility"), with no additional borrowings available as of
June 30, 1999. Borrowings outstanding under the Credit Facility are payable in
42 monthly installments, bear interest at rates ranging from 13.3% to 15.1% and
are collateralized by the equipment and leasehold improvements purchased with
the proceeds of the borrowing. At June 30, 1999, the outstanding borrowings on
the Credit Facility are due as follows: fiscal 2000, $5,480,000; fiscal 2001,
$6,286,600; fiscal 2002, $6,874,200; and fiscal 2003, $2,986,000.

CAPITAL LEASE FACILITY

    At June 30, 1999, the Company had $820,000 available on a $2.5 million
facility under which the Company leases certain equipment under capital leases.
Leases outstanding at June 30, 1999 expire on various dates through fiscal 2019
(see Note 12).

8. INCOME TAXES

    The Company's deferred income tax assets at June 30 are comprised of the
following:

<TABLE>
<CAPTION>
                                                       1998           1999
                                                    -----------   ------------
<S>                                                 <C>           <C>
Net deferred tax assets:
  Net operating loss carryforwards................  $ 1,871,700   $ 10,755,900
  Stock compensation expense on nonqualified stock
    options.......................................      485,300      1,067,000
  Accruals deductible in different periods........      114,700        935,200
  Depreciation and amortization...................      (65,200)      (231,600)
                                                    -----------   ------------
                                                      2,406,500     12,526,500
Valuation allowance...............................   (2,406,500)   (12,526,500)
                                                    -----------   ------------
Total.............................................  $        --   $         --
                                                    ===========   ============
</TABLE>

                                      F-47
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

    The Company's effective rate differs from the federal statutory tax rate for
the years ended June 30, 1997, 1998 and 1999 as follows:

<TABLE>
<CAPTION>
                                                            1997       1998       1999
                                                          --------   --------   --------
<S>                                                       <C>        <C>        <C>
Federal statutory tax rate..............................    35.0%      35.0%      35.0%
State taxes, net of federal benefit.....................     3.0        3.0        2.9
Joint venture termination fee...........................    (9.1)        --         --
Other...................................................    (0.1)      (0.3)      (0.4)
Valuation allowance.....................................   (28.8)     (37.7)     (37.5)
                                                           -----      -----      -----
Effective tax rate......................................      --%        --%        --%
                                                           =====      =====      =====
</TABLE>

    The Company has no income tax provision due to its history of operating
losses. Due to the uncertainty surrounding the realization of the benefits of
its favorable tax attributes in future tax returns, the Company has fully
reserved its net deferred tax assets as of June 30, 1997,1998 and 1999.

    At June 30, 1999, the Company had net operating loss carryforwards of
approximately $28.4 million for federal and $14.2 million for state income tax
purposes. These carryforwards begin to expire in 2003 for state and 2010 for
federal purposes. Additionally, Section 382 of the Internal Revenue Code and the
applicable California law impose annual limitations on the use of net operating
loss carryforwards if there is a change in ownership, as defined, within any
three-year period. The utilization of certain net operating loss carryforwards
may be limited due to the Company's capital stock transactions.

9. STOCKHOLDERS' EQUITY

STOCK SPLITS

    During November 1998, the Company reincorporated in the State of Delaware
and effected a stock exchange of one share of common stock and preferred stock
for every two and one-half shares of common stock and preferred stock,
respectively, of its California predecessor entity. The Company also effected
another reverse stock split during November 1998 whereby one share of common and
preferred stock was issued for every 1.6 shares of common stock and preferred
stock. All share and per share amounts in these financial statements have been
adjusted to give effect to these reverse stock splits.

    On May 7, 1999, the Company distributed a two-for-one stock split effected
as a stock dividend. All share or per share amounts in the consolidated
financial statements have been adjusted to give effect to this stock split.

INITIAL PUBLIC OFFERING

    On December 10, 1998, the Company sold 10,000,000 shares of common stock in
an underwritten public offering and on December 30, 1998 sold an additional
1,500,000 shares through the exercise of the underwriters' over-allotment option
for net proceeds of approximately $67,822,000.

STOCK OFFERING

    On April 30, 1999, the Company sold 5,650,356 shares of its common stock in
an underwritten public offering at a price of $42.50 per share and on May 5,
1999 sold an additional 1,200,000 shares through the exercise of the
underwriters' overallotment option for net proceeds to the Company of
approximately $273,421,500.

                                      F-48
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

CONVERTIBLE PREFERRED STOCK AND WARRANTS

    In fiscal 1997, the Company issued 2,050,000 shares of Series A convertible
preferred stock for cash of $200,000 and the conversion of advances of $210,000.
Also in fiscal 1997, the Company issued 1,000,000 shares of Series B convertible
preferred stock in connection with the acquisition of DSK, Inc. (see Note 11)
and issued 1,000,000 shares of Series B convertible preferred stock for cash of
$600,000. In fiscal 1998, the Company issued 1,263,792 shares of Series B
convertible preferred stock and 4,006,000 shares of Series C convertible
preferred stock upon conversions of notes, advances, and accrued interest of
$1,011,100 and $3,873,400, respectively (see Note 6). In fiscal 1999, the
Company issued 4,230,756 shares of Series D convertible preferred stock for cash
of $2,771,000 (net of costs of $229,000) and the conversion of notes and
advances of $8,000,000. During the same period, the Company issued 817,550
shares of Series E convertible preferred stock for cash of $3,846,400 (net of
costs of $223,600).

    As discussed in Note 6, pursuant to certain exchange agreements entered into
on December 31, 1997, the Company issued warrants to acquire 247,472 shares of
Series B convertible preferred stock at $1.00 per share. Also, during fiscal
1998, the Company issued a warrant to purchase 2,500 shares of Series D
convertible preferred stock at an exercise price of $2.00 per share in
connection with a revolving line of credit from a bank that expired in
May 1999.

    Simultaneously with the closing of the initial public offering, all
14,368,098 shares of the Company's preferred stock were converted into common
stock on a share for share basis. Additionally, all of the holders of warrants
to purchase 247,472 shares of Series B convertible preferred stock exercised
such warrants through a net issuance provision and were issued 209,400 shares of
common stock. Also in connection with the initial public offering, the warrant
to acquire 2,500 shares of Series D convertible preferred stock was converted
into a warrant to purchase an equivalent number of common shares at an exercise
price of $2.00 per share.

COMMON STOCK RESERVED FOR FUTURE ISSUANCE

    At June 30, 1999, the Company has reserved the following shares of common
stock for issuance in connection with:

<TABLE>
<S>                                                           <C>
Warrants issued and outstanding.............................    350,036
Options issued and outstanding..............................  5,057,606
Options available under stock option plans..................  1,108,547
Shares available under 1998 Purchase Plan...................    263,182
                                                              ---------
Total.......................................................  6,779,371
                                                              =========
</TABLE>

COMMON STOCK SUBJECT TO REPURCHASE

    Upon the exercise of certain unvested employee stock options, the Company
issued to the employees common stock which is subject to repurchase by the
Company at the original exercise price of the stock option. This right lapses
over the original vesting period. At June 30, 1999, 66,661 shares were subject
to repurchase.

                                      F-49
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

STOCK OPTION PLANS

    Under the Company's stock option plans (collectively, the "Plans") a total
of 5,656,712 nonstatutory and incentive common stock options are authorized for
issuance. Nonstatutory stock options may be granted to employees, outside
directors and consultants, and incentive stock options may only be granted to
employees. The Plans provide for the granting of incentive stock options at not
less than 100% of the fair market value of the underlying stock at the grant
date. Nonstatutory stock options may be granted at not less than 85% of the fair
market value of the underlying stock at the date of grant. Options granted to
employees generally vest over four years and expire ten years from the date of
the grant. In addition, upon change in control, all options granted under
certain plans shall immediately vest.

    The plans provide that each nonemployee director who is elected to the
Company's board of directors will automatically be granted a nonstatutory stock
option to purchase 18,750 shares of common stock at an exercise price equal to
the fair value of the common stock on the grant date. These grants vest ratably
over three years. An additional option to purchase 6,250 shares of common stock
will be granted to the nonemployee director each year thereafter with an
exercise price equal to the fair market value of the common stock on that date.
These grants vest after one year of service.

EMPLOYEE STOCK PURCHASE PLAN

    On December 10, 1998, the Company adopted the 1998 Employee Stock Purchase
Plan (the "1998 Purchase Plan"). Under the 1998 Purchase Plan, eligible
employees are allowed to have salary withholdings of up to 15% of their base
compensation to purchase shares of common stock at a price equal to 85% of the
lower of the market value of the stock at the beginning or end of defined
purchase periods. The initial purchase period commenced on December 10, 1998.
The Company has reserved 312,500 shares of common stock for issuance under this
plan. As of June 30, 1999, 49,318 shares have been issued under the 1998
Purchase Plan.

NONPLAN OPTION GRANT

    In connection with its hiring of the Company's President and Chief Operating
Officer in November 1997, the Company granted to this officer options to
purchase 350,000 shares of common stock with an exercise price of $0.20 per
share. The option was immediately exercisable with respect to 20% of the option
shares with the balance exercisable in equal monthly installments over the next
36 months of employment with the Company. However, vesting accelerated upon the
closing of the Company's underwritten public offering. In addition, the option
grant contained an antidilution clause which guaranteed that, prior to any
underwritten initial public offering of the Company's common stock, the number
of shares under the option grant would always be equal to 5% of its outstanding
common stock on a fully diluted basis less 36,666 shares. As a result of various
sales of equity securities and option grants since the initial grant in
November 1997, the officer was issued options to purchase an additional 638,850
shares of common stock at an exercise price of $0.20 per share during fiscal
1999. In connection with this award, the Company recognized $362,100 and
$1,087,200 in stock-based compensation expense during fiscal 1998 and 1999,
respectively.

OPTIONS AND WARRANTS GRANTED TO NONEMPLOYEES

    The Company has granted options and warrants to nonemployees for services
performed and to be performed after the date of grant. In connection with these
awards, the Company recognized $310,100 and $601,500 in stock-based compensation
expense during fiscal 1998 and 1999, respectively. At June 30, 1999,

                                      F-50
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

options to purchase 85,000 shares of common stock at an exercise price of $42.53
were unearned by certain nonemployees. These options vest over three years and
have a term of three years. At June 30, 1999, all services relating to all other
nonemployee awards have been rendered and the related options and warrants were
fully exercisable.

    In connection with the Company's formation of its European joint ventures in
March 1999, the Company agreed that it will grant options to purchase up to
600,000 shares of common stock to employees of the joint ventures upon the joint
ventures meeting certain performance criteria of over the next four years. The
exercise price for these options would be based on the fair market value of the
Company's common stock at the date of grant.

    In connection with the Credit Facility (see Note 7), in fiscal 1998, the
Company issued warrants to purchase 45,000 shares of common stock at a
weighted-average exercise price of $2.31 per share. The fair value of these
warrants is being recognized as interest expense through June 30, 1999. During
fiscal 1999, in connection with an amendment to the Credit Facility, the Company
issued warrants to purchase 67,032 shares of common stock which have a
weighted-average exercise price of $18.72 per share and a term of five years.
The estimated fair value of these warrants of $787,600 is included in deposits
and other assets at June 30, 1999 and is being amortized to interest expense
over the repayment period.

    In connection with the signing of a new facility lease (See Note 12) in
fiscal 1999, the Company issued the lessor a warrant to purchase 200,000 shares
of its common stock at $5.00 per share. The estimated fair value of this warrant
of $609,100 is included in deposits and other assets at June 30, 1999 and will
be amortized to expense over the lease period.

    At June 30, 1998, warrants to purchase 64,686 shares of common stock at a
weighted-average exercise price of $2.10 per share were outstanding; such
warrants expire in 2003. All of these warrants were issued during the year ended
June 30, 1998 and had an estimated weighted-average fair value of $1.23 per
share at the date of grant. During fiscal 1999, warrants to purchase 302,662
shares of common stock at a weighted-average exercise price of $7.99 were issued
and had an estimated weighted-average fair value of $4.72 per share at date of
grant. At June 30, 1999, warrants to purchase 350,036 shares of common stock at
a weighted-average exercise price of $7.17 per share were outstanding.

OPTION REPRICING

    On December 1, 1998, the Company repriced 928,850 options previously granted
at $6.00 to $8.00 per share to fair value at that date of $5.00 per share.

                                      F-51
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

    Stock option activity is summarized as follows:

<TABLE>
<CAPTION>
                                                           OUTSTANDING OPTIONS
                                                          ---------------------
                                                                       WEIGHTED
                                                                       AVERAGE
                                                            NUMBER     EXERCISE
                                                          OF SHARES     PRICE
                                                          ----------   --------
<S>                                                       <C>          <C>
Balance, July 1, 1996 (137,500 shares vested at a
  weighted average exercise price of $0.02 per share)...   1,140,000    $ 0.02

Granted.................................................     450,000      0.07
Exercised...............................................     (31,250)     0.02
Canceled................................................    (388,750)     0.02
                                                          ----------
Balance, June 30, 1997 (219,374 shares vested at a
  weighted average exercise price of $0.02 per share)...   1,170,000      0.03

Granted.................................................   1,142,612      0.59
Exercised...............................................    (322,446)     0.10
Canceled................................................     (32,334)     0.31
                                                          ----------
Balance, June 30, 1998 (734,270 shares vested at a
  weighted average exercise price of $0.19 per share)...   1,957,832      0.34

Granted.................................................   5,058,100     15.61
Exercised...............................................    (822,908)     0.50
Canceled................................................  (1,135,418)     6.35
                                                          ----------
Balance, June 30, 1999..................................   5,057,606    $14.24
                                                          ==========
</TABLE>

    The following table summarizes information as of June 30, 1999 concerning
currently outstanding and vested options:

<TABLE>
<CAPTION>
                                   OPTIONS OUTSTANDING               OPTIONS VESTED
                          -------------------------------------   --------------------
                                          WEIGHTED
                                          AVERAGE      WEIGHTED               WEIGHTED
       RANGE OF                          REMAINING     AVERAGE                AVERAGE
       EXERCISE             NUMBER      CONTRACTUAL    EXERCISE    NUMBER     EXERCISE
        PRICES            OUTSTANDING   LIFE (YEARS)    PRICE     OF SHARES    PRICE
- -----------------------   -----------   ------------   --------   ---------   --------
<S>                       <C>           <C>            <C>        <C>         <C>
        $ 0.02 - $ 0.60    1,621,374        8.3        $   0.17   1,185,423   $   0.19
          2.00 -   2.60      276,628        8.5            2.29      45,397       2.12
          4.00 -   6.50    1,337,654        9.2            5.17     337,103       5.36
         12.25 -  41.06    1,595,550        9.7           33.34     690,668      36.47
         42.53 - $75.13      226,400        9.5           48.55       7,500      46.63
                           ---------        ---        --------   ---------   --------
                           5,057,606        9.1        $  14.24   2,266,091   $  12.21
                           =========        ===        ========   =========   ========
</TABLE>

    At June 30, 1999, 1,108,547 shares remained available for future grant.

                                      F-52
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                    YEARS ENDED JUNE 30, 1997, 1998 AND 1999

ADDITIONAL STOCK PLAN INFORMATION

    As discussed in Note 1, the Company accounts for its stock-based awards to
employees using the intrinsic value method in accordance with APB Opinion
No. 25, ACCOUNTING FOR STOCK ISSUED TO EMPLOYEES, and its related
interpretations.

    SFAS No. 123, ACCOUNTING FOR STOCK-BASED COMPENSATION, requires the
disclosure of pro forma net income (loss) and net income (loss) per share had
the Company adopted the fair value method since the Company's inception. Under
SFAS No. 123, the fair value of stock-based awards to employees is calculated
through the use of option pricing models, even though such models were developed
to estimate the fair value of freely tradable, fully transferable options
without vesting restrictions, which significantly differ from the Company's
stock option awards. These models also require subjective assumptions, including
future stock price volatility and expected time to exercise, which greatly
affect the calculated values.

    The Company's calculations for employee grants were made using the minimum
value method for grants prior to September 8, 1998 and the fair value method for
grants after that date with the following weighted average assumptions: expected
life, one year following vesting; risk free interest rate of 6%; and no
dividends during the expected term. In addition, volatility of 70% was used for
grants valued under the fair value method. The Company's calculations are based
on a multiple award valuation approach and forfeitures are recognized as they
occur. If the computed values of the Company's stock-based awards to employees
had been amortized to expense over the vesting period of the awards as specified
under SFAS No. 123, net loss would have been $1,803,800 ($4.59 per basic and
diluted share), $5,111,000 ($9.75 per basic and diluted share) and $37,202,000
($2.24 per basic and diluted share) for the years ended June 30, 1997, 1998 and
1999, respectively.

    The number and estimated weighted-average grant date value per option for
employee and nonemployee awards during the year are as follows:

<TABLE>
<CAPTION>
                                               1997        1998         1999
                                             --------   ----------   ----------
<S>                                          <C>        <C>          <C>
Employee options:
  Number of shares.........................        --    1,003,250    4,957,600
  Estimated weighted average value.........  $     --   $     0.10   $     5.98
Nonemployee options:
  Number of shares.........................   450,000      139,362      100,500
  Estimated weighted average value.........  $   0.02   $     0.08   $    20.43
</TABLE>

                                      F-53
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                   YEARS ENDED JUNE 30, 1997, 1998 AND 1999.

10. NET LOSS PER SHARE

    The following is a reconciliation of the numerators and denominators used in
computing basic and diluted net loss per share at June 30:

<TABLE>
<CAPTION>
                                           1997          1998           1999
                                        -----------   -----------   ------------
<S>                                     <C>           <C>           <C>
Net loss (numerator), basic and
  diluted.............................  $(1,802,800)  $(5,425,000)  $(26,554,900)
                                        ===========   ===========   ============
Shares (denominator):
  Weighted average common shares
    Outstanding.......................      393,236       530,224     16,675,822
  Weighted average common shares
    Outstanding subject to
    repurchase........................           --        (5,616)       (32,795)
                                        -----------   -----------   ------------
Shares used in computation, basic and
  diluted.............................      393,236       524,608     16,643,027
                                        ===========   ===========   ============
Net loss per share, basic and
  diluted.............................  $     (4.58)  $    (10.34)  $      (1.60)
                                        ===========   ===========   ============
</TABLE>

    For the above mentioned periods, the Company had securities outstanding
which could potentially dilute basic net income per share in the future, but
were excluded in the computation of diluted net loss per share in the periods
presented, as their effect would have been antidilutive. At June 30, 1999,
outstanding potentially dilutive securities consist of 66,661 outstanding shares
of common stock subject to repurchase, and options and warrants to purchase
5,407,642 shares of common stock.

11. JOINT VENTURE TERMINATION FEE

    In fiscal 1996, the Company entered into a joint venture agreement (the
"Agreement") with DSK, Inc. ("DSK") to cooperatively market and develop the
Company's services. The Company paid $33,700 to DSK during the year ended
June 30, 1997 related to the Agreement.

    In April 1997, the Company terminated the Agreement and hired the majority
stockholders of DSK as either employees or consultants by issuing 1,000,000
fully vested shares of the Series B preferred stock with a fair value of $0.60
per share, or $600,000, for the outstanding shares of common stock of DSK. The
Company recorded the transaction by allocating the value of the shares issued to
property and equipment (at DSK's net book value of $168,900, which approximated
fair value), with the balance of $431,100 reflected as a joint venture
termination fee.

    Additionally, in April 1997, the Company granted to certain of the former
owners of DSK options to purchase a total of 250,000 shares of its common stock
at $0.06 per share for real estate consulting services to be performed. In
June 1998, the Company accelerated the vesting of all the DSK options awarded.
In conjunction with this award, the Company recognized $604,200 of stock-based
compensation expense during fiscal 1998.

                                      F-54
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                   YEARS ENDED JUNE 30, 1997, 1998 AND 1999.

12. COMMITMENTS AND CONTINGENCIES

    LEASES

    The Company leases its facilities under noncancelable operating leases.
These leases expire on various dates through fiscal 2002. Minimum future lease
payments under noncancelable operating and capital leases as of June 30, 1999
are summarized as follows:

<TABLE>
<CAPTION>
YEARS ENDING                                                    CAPITAL      OPERATING
JUNE 30,                                                        LEASES        LEASES
- ------------                                                  -----------   -----------
<S>                                                           <C>           <C>
  2000......................................................  $ 1,320,600   $ 3,903,200
  2001......................................................    1,282,100     4,108,000
  2002......................................................      921,500     4,215,100
  2003......................................................      630,000     4,305,600
  2004......................................................      630,000     4,341,700
Thereafter..................................................    9,060,000    47,604,800
                                                              -----------   -----------
Total minimum lease payments................................  $13,844,200   $68,478,400
                                                              ===========   ===========
Less amount representing interest at rates ranging from
  13.253% to 14.68%.........................................   (8,102,300)
                                                              -----------
Present value of minimum lease payments.....................    5,741,900
Less current portion........................................     (569,200)
                                                              -----------
Long-term portion...........................................  $ 5,172,700
                                                              ===========
</TABLE>

    Rent expense under operating leases for the years ended June 30, 1997, 1998
and 1999 was $444,900, $917,000 and $1.3 million, respectively.

    Effective in fiscal 2000, the Company has committed to lease additional
facilities. The lease is for a minimum term of 20 years with annual rental
payments increasing from approximately $3 million to $4 million over the lease
term.

    On June 29, 1999, the Company entered into an agreement to purchase
approximately nine acres of land in Fairfax County, Virginia, for $7,750,000
which is expected to close in fiscal 2000. The Company intends to open a
facility on the site in fiscal 2001.

    See Note 4 regarding the Company's agreements to lease fiber optic cable
systems.

    PURCHASE COMMITMENTS

    The Company has entered into noncancelable commitments to purchase property
and equipment related to the expansion of its operations facilities. As of
June 30, 1999, approximately $48 million was committed for purchases under these
agreements through fiscal 2000.

    TELECOMMUNICATIONS AND PEERING ARRANGEMENTS

    The Company has guaranteed to pay certain monthly usage levels or fees with
various communications or interconnect providers. Minimum payments under these
agreements at June 30, 1999 are approximately $24.8 million in fiscal 2000;
$24.7 million in fiscal 2001; $23.1 million in fiscal 2002; $14.4 million in
fiscal 2003; $13.7 million in fiscal 2004; and $8.6 million in fiscal 2005.

                                      F-55
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                   YEARS ENDED JUNE 30, 1997, 1998 AND 1999.

    The Company is a party to numerous peering agreements with other internet
providers to allow for the exchange of internet traffic. These agreements do not
have fee commitments and generally have a one year term with automatic renewals.
The Company does not record any revenue or expense associated with these
non-cash transactions as such transactions do not represent the culmination of
the earnings process and the fair value of such transactions are not reasonably
determinable.

    LEGAL MATTERS

    On June 29, 1999, an alleged stockholder of AboveNet filed a lawsuit in the
Court of Chancery of the State of Delaware. The plaintiff, who purports to
represent a class of all AboveNet stockholders, challenges the terms of the
merger between AboveNet and Metromedia Fiber Network, Inc. ("Metromedia") (see
Note 17). Four other vitually identical complaints have also been filed in the
Delaware Court of Chancery. None of these four complaints has been served.
AboveNet believes these lawsuits are without merit and intends to defend itself
vigorously, and accordingly, management does not expect that the outcome of
these cases will have a material effect on the Company's financial position or
results of operations.

13. RELATED PARTY TRANSACTIONS

    A member of the Board of Directors is the president of an entity which is
the co-manager of the Company's primary facilities. Rent expense in fiscal 1997,
1998 and 1999 for these facilities was $16,400, $265,200 and $1,073,200,
respectively. The Company believes that its lease arrangements were on an arm's
length basis.

    During fiscal 1999, the same entity was granted a warrant to purchase
200,000 shares of common stock in connection with the signing of a new facility
lease (see Note 9). The estimated fair value of the warrant when granted was
$609,100.

14. MAJOR CUSTOMERS

    For the year ended June 30, 1999, no one customer accounted for more than
10% of revenues. One customer accounted for 14% and 12% of revenues in fiscal
1998 and 1997, respectively.

    At June 30, 1999, one customer accounted for approximately 10% of trade
receivables. At June 30, 1998, two customers accounted for approximately 22% and
13% of trade receivables.

15. GEOGRAPHIC DATA

    During the year ended June 30, 1999, the Company generated approximately 14%
of its revenues from customers domiciled in countries other than the United
States, primarily in Asia. For the years ended June 30, 1998 and 1997,
substantially all of the Company's revenues were derived from domestic
customers.

16. 401(K) PLAN

    In May 1998, the Company began a 401(k) plan (the Plan) that covers all
employees who meet the Plan's eligibility requirements. Eligible employees can
contribute up to 15% of their salary, subject to certain IRS limitations. The
Company's contributions related to fiscal 1998 and 1999 were zero and $168,100,
respectively.

                                      F-56
<PAGE>
                          ABOVENET COMMUNICATIONS INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                   YEARS ENDED JUNE 30, 1997, 1998 AND 1999.

17. SUBSEQUENT EVENTS

    In August 1999, the Company entered into an additional agreement for the
acquisition of an indefeasible right to use additional capacity on a fiber optic
cable system between the U.S. and the United Kingdom for a 25-year period. The
agreement commits the Company to pay approximately $15.8 million in a series of
installments through October 1999.

    On September 8, 1999, the Company completed a merger with Metromedia Fiber
Network, Inc. ("MFN"). Under the terms of the agreement, AboveNet stockholders
received 1.175 shares of MFN Class A common stock for each AboveNet share owned.
Additionally, upon completion of the merger, all outstanding stock options
granted prior to June 18, 1999 became immediately vested.

                                      F-57
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors of
Compaq Computer Corporation

    We have audited the accompanying Combined Statement of Assets to be Acquired
and Liabilities to be Assumed of Palo Alto Internet Exchange (the "Business") as
of December 26, 1998 and the related Combined Statement of Revenues and Direct
Expenses for the period June 12, 1998 through December 26, 1998. These
statements are the responsibility of the Business' and Compaq Computer
Corporation's management. Our responsibility is to express an opinion on these
statements based on our audit.

    We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the statements. An audit also includes assessing
the accounting principles used and significant estimates made by management, as
well as evaluating the overall presentation of the statements. We believe that
our audit provides a reasonable basis for our opinion.

    The accompanying statements were prepared for the purpose of complying with
the rules and regulations of the Securities and Exchange Commission (for
inclusion in the Current Report on Form 8-K of AboveNet Communications Inc.) as
described in Note 2 and are not intended to be a complete presentation of the
Business' financial position or results of operations.

    In our opinion, the statements referred to above present fairly, in all
material respects, the assets to be acquired and liabilities to be assumed as of
December 26, 1998 and the revenues and direct expenses described in Note 2 of
the Business for the period June 12, 1998 through December 26, 1998, in
conformity with generally accepted accounting principles.

PRICEWATERHOUSECOOPERS LLP

Boston, Massachusetts
June 15, 1999

                                      F-58
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors of
Compaq Computer Corporation

    We have audited the accompanying Combined Statement of Assets to be Acquired
and Liabilities to be Assumed of Palo Alto Internet Exchange (the "Business") as
of December 27, 1997 and the related Combined Statement of Revenues and Direct
Expenses for the period December 28, 1997 through June 11, 1998 and the fiscal
years ended December 27, 1997 and December 29, 1996. These statements are the
responsibility of the Business' and Compaq Computer Corporation's management.
Our responsibility is to express an opinion on these statements based on our
audits.

    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the statements. An audit also includes assessing
the accounting principles used and significant estimates made by management, as
well as evaluating the overall presentation of the statements. We believe that
our audits provide a reasonable basis for our opinion.

    The accompanying statements were prepared for the purpose of complying with
the rules and regulations of the Securities and Exchange Commission (for
inclusion in the Current Report on Form 8-K of AboveNet Communications Inc.) as
described in Note 2 and are not intended to be a complete presentation of the
Business' financial position or results of operations.

    In our opinion, the statements referred to above present fairly, in all
material respects, the assets to be acquired and liabilities to be assumed as of
December 27, 1997 and the revenues and direct expenses described in Note 2 of
the Business for the period December 28, 1997 through June 11, 1998 and the
fiscal years ended December 27, 1997 and December 29, 1996, in conformity with
generally accepted accounting principles.

PRICEWATERHOUSECOOPERS LLP

Boston, Massachusetts
June 15, 1999

                                      F-59
<PAGE>
                          PALO ALTO INTERNET EXCHANGE

   COMBINED STATEMENT OF ASSETS TO BE ACQUIRED AND LIABILITIES TO BE ASSUMED

                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                            MARCH 27,
                                              1999       DECEMBER 26,   DECEMBER 27,
                                           (UNAUDITED)       1998           1997
                                           -----------   ------------   ------------
<S>                                        <C>           <C>            <C>
ASSETS TO BE ACQUIRED:
  Unbilled accounts receivable...........    $   102        $    18        $   14
  Prepaid expenses.......................         29              2             1
  Property and equipment, net............      3,405          3,088         2,750
  Intangible assets, net.................     32,863         33,756            --
                                             -------        -------        ------
      Total assets to be acquired........    $36,399        $36,864        $2,765
                                             =======        =======        ======
LIABILITIES TO BE ASSUMED:
  Unearned service revenue...............        166            200           106
                                             -------        -------        ------
      Total liabilities to be assumed....        166            200           106
                                             -------        -------        ------
        Net assets to be acquired........    $36,233        $36,664        $2,659
                                             =======        =======        ======
</TABLE>

   The accompanying notes are an integral part of these financial statements.

                                      F-60
<PAGE>
                          PALO ALTO INTERNET EXCHANGE

               COMBINED STATEMENT OF REVENUES AND DIRECT EXPENSES

                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                  PERIOD FROM
                                          QUARTER     QUARTER    JUNE 12, 1998    PERIOD FROM       FISCAL         FISCAL
                                           ENDED       ENDED        THROUGH      DECEMBER 28,     YEAR ENDED     YEAR ENDED
                                         MARCH 27,   MARCH 26,   DECEMBER 26,    1997 THROUGH    DECEMBER 27,   DECEMBER 29,
                                           1999        1998          1998        JUNE 11, 1998       1997           1996
                                         ---------   ---------   -------------   -------------   ------------   ------------
                                              (UNAUDITED)
<S>                                      <C>         <C>         <C>             <C>             <C>            <C>
Service revenues.......................   $1,534       $ 892        $ 2,630         $1,732         $ 1,895        $   155
                                          ------       -----        -------         ------         -------        -------
Direct expenses:
  Cost of revenues.....................      616         817          1,548          1,440           2,579            537
  Research and development.............       --           4              9              8              54            599
  Selling, general and administrative
    expenses...........................      131          83            191            242             700            121
  Amortization of intangible assets....      893          --          1,944             --              --             --
                                          ------       -----        -------         ------         -------        -------
      Total direct expenses............    1,640         904          3,692          1,690           3,333          1,257
                                          ------       -----        -------         ------         -------        -------
        Excess (shortfall) of revenues
          over direct expenses.........   $ (106)      $ (12)       $(1,062)        $   42         $(1,438)       $(1,102)
                                          ======       =====        =======         ======         =======        =======
</TABLE>

   The accompanying notes are an integral part of these financial statements.

                                      F-61
<PAGE>
                          PALO ALTO INTERNET EXCHANGE

             NOTES TO COMBINED STATEMENTS OF ASSETS TO BE ACQUIRED
                       AND LIABILITIES TO BE ASSUMED AND
              COMBINED STATEMENTS OF REVENUES AND DIRECT EXPENSES

                             (AMOUNTS IN THOUSANDS)

1. DESCRIPTION OF BUSINESS:

    The Palo Alto Internet Exchange ("PAIX" or the "Business") is a business
within the Technology & Corporate Development and Operations Management Services
business units of Compaq Computer Corporation ("Compaq," formerly Digital
Equipment Corporation, "Digital," collectively the "Company"). The Business is a
high-level switching and peering point for global and regional Internet Service
Providers ("ISP") and content providers. The Business features a data center to
provide global services to PAIX customers for transmission of data in
high-volume over the worldwide Internet network. The Business utilizes a highly
redundant fiber-based infrastructure owned by multiple data carriers, including
the 30-mile fiber ring owned by the City of Palo Alto. The Business was started
in 1993 as a research project within the Company and commenced meaningful
operations during fiscal year 1996. The business is engaged primarily in
providing Internet interconnectivity solutions and related services in support
of mission critical Internet operations of its customers.

2. BASIS OF PRESENTATION:

    The accompanying Combined Statement of Assets to be Acquired and Liabilities
to be Assumed and Combined Statement of Revenues and Direct Expenses ("the
financial statements") have been prepared for the purpose of complying with the
rules and regulations of the Securities and Exchange Commission for inclusion in
the Current Report on Form 8-K of AboveNet Communications, Inc. ("AboveNet").
The Combined Statement of Assets to be Acquired and Liabilities to be Assumed
includes the Business' assets to be sold to and liabilities to be assumed by
AboveNet, in accordance with the Asset Purchase Agreement dated May 21, 1999
(the "Agreement"). Compaq and AboveNet also entered into certain service
contracts and other arrangements that are described in the Agreement. These
arrangements include, but are not limited to, access to the Internet, favorable
pricing terms on such future services, and non-relocation and non-compete
arrangements. The terms of such contracts and other arrangements range from one
to 20 years. The assets to be acquired and liabilities to be assumed include
unbilled accounts receivable, prepaid expenses, property and equipment,
intangibles and unearned service revenue. The Combined Statement of Revenues and
Direct Expenses includes only those revenues and expenses directly related to
the Business to be sold. The financial statements exclude any other activity and
related expense that are not directly attributable to the Business, such as
corporate general and administrative costs, income taxes and interest expense.

    The financial statements of the Business are derived from the historic books
and records of Digital through June 11, 1998. As a result of the acquisition of
Digital by Compaq on June 11, 1998, the financial statements of the Business
after the acquisition date are derived from the historic books and records of
Compaq.

    As mentioned above, indirect costs allocated to the Business from the
Company, such as certain corporate general and administrative costs, have been
excluded from the financial statements on the basis that such costs are not
direct costs of the Business. However, in determining the Business' direct
expenses, certain allocations were made for expenses incurred by the Company, as
appropriate, that are directly attributed to the services provided to the
Business. These allocations relate primarily to engineering support in
connection with the delivery of services, facility and other occupancy costs,
and other general and administrative functions performed directly on behalf and
for the benefit of the Business. Costs for

                                      F-62
<PAGE>
                          PALO ALTO INTERNET EXCHANGE

             NOTES TO COMBINED STATEMENTS OF ASSETS TO BE ACQUIRED
                       AND LIABILITIES TO BE ASSUMED AND
        COMBINED STATEMENTS OF REVENUES AND DIRECT EXPENSES (CONTINUED)

                             (AMOUNTS IN THOUSANDS)

2. BASIS OF PRESENTATION: (CONTINUED)
such services have been reflected in the financial statements on the basis of
activity or utilization, estimated support provided to the Business, or other
methods management believe to be reasonable.

    Cost of revenues primarily consists of costs relating to facility rent, data
communications and telecommunication expenses, service delivery and engineering
support personnel and depreciation expense.

    The financial statements have been prepared in accordance with the Company's
accounting policies and generally accepted accounting principles. However, these
statements do not purport to represent the costs and expenses which may be
incurred by an unaffiliated company to achieve similar results. In addition, the
financial statements do not purport to represent the financial position of the
Business.

FISCAL YEAR

    For purposes of these financial statements the fiscal year of PAIX is a
fifty-two week period ending the Saturday nearest the last day of December.

USE OF ESTIMATES

    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
judgments that affect the reported amounts of assets, liabilities, revenues and
direct expenses, and related disclosure of contingent assets and liabilities.
Actual results could differ from those estimates.

PROPERTY AND EQUIPMENT

    Building improvements, computer, telecommunications, and office equipment
and construction-in-progress are stated at cost less depreciation, which is
computed using the straight-line method. Expenditures for improvements which
substantially extend the useful life or increase the capacity of an asset are
capitalized. Ordinary repairs and maintenance are expensed as incurred.
Estimated useful lives for purposes of computing depreciation expense range from
two to 10 years.

INTANGIBLE ASSETS

    Intangible assets, which consist of goodwill and customer lists related to
the acquisition of Digital by Compaq, are amortized on a straight-line basis
over 10 years.

REVENUE

    Service revenue relating to Internet and colocation service contracts are
recognized over the contract period the services are provided. The Business
recognizes installation and certain other service fees as revenue on a per event
basis. Unearned service revenue represents the unearned portion of prepaid
service from Internet and colocation service contracts with customers. Such
amounts are amortized to revenue over the contract period, which ranges from one
year to three years. The Business provides for estimated

                                      F-63
<PAGE>
                          PALO ALTO INTERNET EXCHANGE

             NOTES TO COMBINED STATEMENTS OF ASSETS TO BE ACQUIRED
                       AND LIABILITIES TO BE ASSUMED AND
        COMBINED STATEMENTS OF REVENUES AND DIRECT EXPENSES (CONTINUED)

                             (AMOUNTS IN THOUSANDS)

2. BASIS OF PRESENTATION: (CONTINUED)
future losses on Internet and colocation service contracts, to the extent such
losses are probable and estimable.

RESEARCH AND DEVELOPMENT

    Research and development costs of the Business are charged to expense in the
period incurred.

LONG-LIVED ASSETS

    The Business reviews for the impairment of long-lived assets whenever events
or changes in circumstances indicate that the carrying amount of an asset may
not be recoverable. An impairment loss would be recognized when estimated future
cash flows expected to result from the use of the asset and its eventual
disposition is less than its carrying amount.

CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS

    The Business sells to customers primarily in the Internet and
Telecommunications industries and customers are primarily located in the United
States. The Company performs ongoing credit evaluations of its customers'
financial condition and maintains adequate provisions for uncollectible amounts
when necessary.

    For the periods in the fiscal year ended December 26, 1998, and for the
years ended December 27, 1997 and December 29, 1996, PAIX generated more than
10% of its total revenue from the following customers:

<TABLE>
<CAPTION>
                                                               1998       1997       1996
                                                             --------   --------   --------
<S>                                                          <C>        <C>        <C>
UUNet......................................................     12%        19%        35%
BBN\GTE Internetworking....................................     --         --         14%
Epoch......................................................     --         --         31%
Genuity....................................................     --         --         11%
</TABLE>

    As of December 26, 1998 and December 27, 1997, customers which comprised 10%
or more of accounts receivable were as follows:

<TABLE>
<CAPTION>
                                                                1998       1997
                                                              --------   --------
<S>                                                           <C>        <C>
UUNet.......................................................     23%        25%
Epoch.......................................................     --         20%
</TABLE>

UNAUDITED INTERIM FINANCIAL INFORMATION

    The interim financial information for the quarters ended March 27, 1999 and
March 26, 1998 is unaudited and has been prepared on the same basis as the
audited financial statements. In the opinion of management, such unaudited
information includes all adjustments (consisting only of normal recurring
adjustments) necessary for a fair presentation of the interim information.
Results for the three months

                                      F-64
<PAGE>
                          PALO ALTO INTERNET EXCHANGE

             NOTES TO COMBINED STATEMENTS OF ASSETS TO BE ACQUIRED
                       AND LIABILITIES TO BE ASSUMED AND
        COMBINED STATEMENTS OF REVENUES AND DIRECT EXPENSES (CONTINUED)

                             (AMOUNTS IN THOUSANDS)

2. BASIS OF PRESENTATION: (CONTINUED)
ended March 27, 1999 are not necessarily indicative of results to be expected
for the year ending December 31, 1999.

3. PROPERTY AND EQUIPMENT:

    Major classifications of property and equipment consisted of the following:

<TABLE>
<CAPTION>
                                         ESTIMATED      DECEMBER 26,   DECEMBER 27,
                                       USEFUL LIVES         1998           1997
                                      ---------------   ------------   ------------
<S>                                   <C>               <C>            <C>
Building improvements...............         10 years      $2,479         $2,450
Computer equipment..................       2-3 years           52             87
Office equipment....................         10 years           6             --
Electrical and telecommunications
  equipment.........................          3 years         251            388
Construction in progress............               --         521            112
                                                           ------         ------
Less: accumulated depreciation......                         (221)          (287)
                                                           ------         ------
                                                           $3,088         $2,750
                                                           ======         ======
</TABLE>

    Depreciation expense was approximately $221, $184, $286 and $1 for the
period June 12, 1998 through December 26, 1998, the period December 28, 1997
through June 11, 1998, and the fiscal years ended December 27, 1997 and
December 29, 1996, respectively.

4. INTANGIBLE ASSETS:

    Intangible assets consisted of the following:

<TABLE>
<CAPTION>
                                                         DECEMBER 26,   JUNE 11,
                                                             1998         1998
                                                         ------------   --------
<S>                                                      <C>            <C>
Goodwill...............................................     $27,400     $27,400
Customer lists.........................................       8,300       8,300
Less: accumulated amortization.........................      (1,944)         --
                                                            -------     -------
                                                            $33,756     $35,700
                                                            =======     =======
</TABLE>

    On June 11, 1998, Compaq consummated its acquisition of Digital and
allocated its purchase price to the assets acquired and liabilities assumed
based on Compaq's estimates of fair value. The fair value assigned to intangible
assets acquired was based on a valuation prepared by an independent third-party
appraisal company and included goodwill and customer lists related to the
Business.

5. COMMITMENTS AND CONTINGENCIES:

    The Company, on behalf of the Business, has entered into service contracts
with customers and telecommunications vendors to provide services.

                                      F-65
<PAGE>
                          PALO ALTO INTERNET EXCHANGE

             NOTES TO COMBINED STATEMENTS OF ASSETS TO BE ACQUIRED
                       AND LIABILITIES TO BE ASSUMED AND
        COMBINED STATEMENTS OF REVENUES AND DIRECT EXPENSES (CONTINUED)

                             (AMOUNTS IN THOUSANDS)

5. COMMITMENTS AND CONTINGENCIES: (CONTINUED)
    In some instances, the Company provides limited warranties to customers in
connection with Internet and colocation service contracts. To date, costs
incurred in connection with such warranties have been immaterial.

6. LEGAL MATTERS:

    The Company is involved in lawsuits, claims, investigations, and proceedings
which are being handled and defended in the ordinary course of business. There
are no such matters pending that the Company and its General Counsel expect to
be material in relation to the Business and no amounts have been accrued in the
financial statements for such matters.

7. RELATED PARTY TRANSACTIONS:

    As described in Note 2, the Company incurred expenses for services performed
directly on behalf and for the benefit of the Business. Costs for such services
have been reflected in the accompanying Statement of Revenues and Direct
Expenses on the basis of activity or utilization, estimated support provided to
the Business, or other methods management believe to be reasonable. The cost of
such services is presented as cost of revenue, research and development and
general and administrative.

    The Business has no external borrowings and there has been no allocation of
the Company's consolidated borrowings and related interest expense in the
financial statements.

    The Business recognized revenue from AboveNet of $66, $36, $22 and $0 for
the period June 12, 1998 through December 26, 1998, the period December 28, 1997
through June 11, 1998, and the fiscal years ended December 27, 1997 and
December 29, 1996, respectively. Accounts receivable from AboveNet are $11 and
$4 at December 26, 1998 and December 27, 1997, respectively.

                                      F-66
<PAGE>
P R O S P E C T U S

                                     [LOGO]
                                 --------------

    From time to time, we may sell any of the following securities:

    -  Debt Securities

    -  Preferred Stock

    -  Class A Common Stock

    -  Warrants

    We will provide the specific terms of these securities in one or more
supplements to this prospectus. You should read this prospectus and any
prospectus supplement carefully before you invest.

    Our class A common stock is traded over-the-counter on The Nasdaq Stock
Market's National Market under the trading symbol "MFNX." The applicable
prospectus supplement will contain information, where applicable, as to any
other listing on The Nasdaq Stock Market's National Market or any securities
exchange of the securities covered by the prospectus supplement.

    In addition, up to 21,505,376 shares of class A common stock being
registered may be offered by certain selling stockholders. For additional
information on the methods of sale, you should refer to the section entitled
"Plan of Distribution."

    The securities may be sold directly by us or, in case of class A common
stock, may be sold by selling stockholders, to investors, through agents
designated from time to time or to or through underwriters or dealers. See "Plan
of Distribution." If any underwriters are involved in the sale of any securities
in respect of which this prospectus is being delivered, the names of such
underwriters and any applicable commissions or discounts will be set forth in a
prospectus supplement. The net proceeds we expect to receive from such sale also
will be set forth in a prospectus supplement. We would not receive any of the
proceeds from the sale of class A common stock by selling stockholders.

    This prospectus may not be used to offer or sell any securities unless
accompanied by a prospectus supplement. We urge you to read carefully this
prospectus and the accompanying prospectus supplement, which will describe the
specific terms of the securities being offered to you, before you make your
investment decision.

    INVESTING IN THE SECURITIES INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING ON
PAGE 3.

    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED THE SECURITIES TO BE ISSUED UNDER THIS
PROSPECTUS OR DETERMINED IF THIS PROSPECTUS IS ACCURATE OR ADEQUATE. ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                The date of this prospectus is October 28, 1999.
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                PAGE
                                                              --------
<S>                                                           <C>
RISK FACTORS................................................      3
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS...........     10
ABOUT THIS PROSPECTUS.......................................     11
BUSINESS....................................................     11
RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK
  DIVIDENDS.................................................     12
USE OF PROCEEDS.............................................     12
DESCRIPTION OF DEBT SECURITIES..............................     13
DESCRIPTION OF CAPITAL STOCK................................     22
DESCRIPTION OF WARRANTS.....................................     28
SELLING STOCKHOLDERS........................................     29
PLAN OF DISTRIBUTION........................................     29
VALIDITY OF SECURITIES......................................     30
EXPERTS.....................................................     30
WHERE YOU CAN FIND MORE INFORMATION.........................     31
INCORPORATION OF INFORMATION WE FILE WITH THE SEC...........     31
</TABLE>

                                       2
<PAGE>
                                  RISK FACTORS

WE HAVE A LIMITED HISTORY OF OPERATIONS

    You will have limited historical financial information upon which to base
your evaluation of our performance. We were formed in April 1993 and have a
limited operating history. We currently have a limited number of customers and
are still in the process of building many of our networks. Accordingly, you must
consider our prospects in light of the risks, expenses and difficulties
frequently encountered by companies in their early stage of development.

WE EXPECT TO CONTINUE TO INCUR NET LOSSES

    We cannot assure you that we will succeed in establishing an adequate
revenue base or that our services will generate profitability. In connection
with the construction of our networks, we have incurred substantial losses. We
expect to continue incurring losses while we concentrate on the development and
construction of our networks and until our networks have established a
sufficient revenue-generating customer base. We also expect to incur losses
during the initial startup phases of any services that we may provide. We expect
to continue experiencing net operating losses for the foreseeable future.
Continued losses may prevent us from pursuing our strategies for growth and
could cause us to be unable to meet our debt service obligations, capital
expenditure requirements or working capital needs.

WE HAVE SUBSTANTIAL DEBT WHICH MAY LIMIT OUR ABILITY TO BORROW, RESTRICT THE USE
  OF OUR CASH FLOWS AND CONSTRAIN OUR BUSINESS STRATEGY, AND WE MAY NOT BE ABLE
  TO MEET OUR DEBT OBLIGATIONS

    We have substantial debt and debt service requirements. Our substantial debt
has important consequences, including:

    - our ability to borrow additional amounts for working capital, capital
      expenditures or other purposes is limited,

    - a substantial portion of our cash flow from operations is required to make
      debt service payments, and

    - our leverage could limit our ability to capitalize on significant business
      opportunities and our flexibility to react to changes in general economic
      conditions, competitive pressures and adverse changes in government
      regulation.

    We cannot assure you that our cash flow and capital resources will be
sufficient to repay our existing indebtedness and any indebtedness we may incur
in the future, or that we will be successful in obtaining alternative financing.
In the event that we are unable to repay our debts, we may be forced to reduce
or delay the completion or expansion of our networks, sell some of our assets,
obtain additional equity capital or refinance or restructure our debt.

WE MAY NOT BE ABLE TO SUCCESSFULLY IMPLEMENT OUR BUSINESS STRATEGY BECAUSE WE
  DEPEND ON FACTORS BEYOND OUR CONTROL, WHICH COULD ADVERSELY AFFECT OUR RESULTS
  OF OPERATIONS

    Our future largely depends on our ability to implement our business strategy
and proposed expansion in order to create the new business and revenue
opportunities. Our results of operations will be adversely affected if we cannot
fully implement our business strategy. Successful implementation depends on
numerous factors beyond our control, including economic, competitive and other
conditions and uncertainties, the ability to obtain licenses, permits,
franchises and rights-of-way on reasonable terms and conditions and the ability
to hire and retain qualified management personnel.

                                       3
<PAGE>
WE CANNOT ASSURE YOU THAT WE WILL SUCCESSFULLY COMPLETE THE CONSTRUCTION OF OUR
  NETWORKS

    The construction of future networks and the addition of Internet service
exchange facilities entail significant risks, including management's ability to
effectively control and manage these projects, shortages of materials or skilled
labor, unforeseen engineering, environmental or geological problems, work
stoppages, weather interference, floods and unanticipated cost increases. The
failure to obtain necessary licenses, permits and authorizations could prevent
or delay the completion of construction of all or part of our networks or
increase completion costs. In addition, our AboveNet Communications Inc.
subsidiary's establishment and maintenance of interconnections with other
network providers at various public and private points (often referred to as
"peering arrangements") is necessary for AboveNet to provide cost efficient
services. We cannot assure you that the budgeted costs of our current and future
projects will not be exceeded or that these projects will commence operations
within the contemplated schedules, if at all.

WE CANNOT ASSURE YOU THAT A MARKET FOR OUR CURRENT OR FUTURE SERVICES WILL
  DEVELOP

    The practice of leasing dark fiber, which is fiber optic cable without any
of the electronic or optronic equipment necessary to use the fiber for
transmission, is not widespread and we cannot assure you that the market will
develop or that we will be able to enter into contracts, comply with the terms
of these contracts or maintain relationships with communications carriers and
corporate and government customers. We also cannot assure you that these
contracts or relationships will be on economically favorable terms or that
communications carriers and corporate and government customers will not choose
to compete against, rather than cooperate with us. If we are unable to enter
into contracts, comply with the terms of the contracts or maintain relationships
with these constituencies, our operations would be materially and adversely
affected. We cannot predict whether providing services to governments will
evolve into a significant market because governments usually already control
existing rights-of-way and often build their own communications infrastructure.
We will need to strengthen our marketing efforts and increase our staff to
handle future marketing and sales requirements. If we fail to obtain
significant, widespread commercial and public acceptance of our networks and
access to sufficient buildings our visibility in the telecommunications market
could be jeopardized. We cannot assure you that we will be able to secure
customers for the commercial use of our proposed networks or access to such
buildings in each market. In addition, the market for co-location and Internet
services, which are offered by AboveNet, is new and evolving. We cannot assure
you that AboveNet's services will achieve widespread acceptance in this new
market. Further, AboveNet's success depends in large part on growth in the use
of the Internet. The growth of the Internet is highly uncertain and depends on a
variety of factors.

    We may expand the range of services that we offer. These services may
include assisting customers with the integration of their leased dark fiber with
appropriate electronic and optronic equipment by facilitating the involvement of
third party suppliers, vendors and contractors. We cannot assure you that a
market will develop for our new services, that implementing these services will
be technically or economically feasible, that we can successfully develop or
market them or that we can operate and maintain our new services profitably.

SEVERAL OF OUR CUSTOMERS MAY TERMINATE THEIR AGREEMENTS WITH US IF WE DO NOT
  PERFORM BY SPECIFIED TIMES

    We currently have some contracts to supply leased fiber capacity which allow
the lessee to terminate the contracts and/or provide for liquidated damages if
we do not supply the stated fiber capacity by a specified time. Terminating any
of these contracts could adversely affect our operating results.

                                       4
<PAGE>
WE MAY BE UNABLE TO RAISE THE ADDITIONAL FINANCING NECESSARY TO COMPLETE THE
  CONSTRUCTION OF OUR NETWORKS, WHICH WOULD ADVERSELY AFFECT OUR LONG-TERM
  BUSINESS STRATEGY

    We may need significant amounts of additional capital to complete the
build-out of our planned fiber optic communications networks, to expand
AboveNet's network infrastructure and to meet our long-term business strategies,
including expanding our networks to additional cities and constructing our
networks in Europe. If we need additional funds, our inability to raise them
will have an adverse effect on our operations. If we decide to raise additional
funds by incurring debt, we may become more leveraged and subject to additional
or more restrictive financial covenants and ratios. In addition, if we issue
equity securities or securities convertible or exchangeable into our equity
securities, current stockholders may face dilution.

COMPETITORS OFFER SERVICES SIMILAR TO OURS IN OUR CURRENT OR PLANNED MARKETS
  WHICH WOULD AFFECT OUR RESULTS OF OPERATIONS

    The telecommunications industry and AboveNet's business are extremely
competitive, particularly with respect to price and service, which may adversely
affect our results of operations. A significant increase in industry capacity or
reduction in overall demand would adversely affect our ability to maintain or
increase prices. In the telecommunications industry, we compete against
incumbent local exchange carriers, which have historically provided local
telephone services and currently dominate their local telecommunications
markets, and competing carriers in the local services market. In addition to
these carriers, several other potential competitors, such as facilities-based
communications service providers, cable television companies, electric
utilities, microwave carriers, satellite carriers, wireless telephone system
operators and large end-users with private networks, are capable of offering,
and in some cases offer, services similar to those offered by us. Furthermore,
several of these service providers, such as wireless service providers, could
build wireless networks more rapidly and at lower cost than fiber optic
networks. Additionally, the business in which AboveNet competes is highly
competitive due to a lack of barriers to entry and high price sensitivity. Many
of our competitors have greater financial, research and development and other
resources than we do.

    Some of our principal competitors already own fiber optic cables as part of
their telecommunications networks. Accordingly, any of these carriers, some of
which already have franchise and other agreements with local and state
governments and substantially greater resources and more experience than us,
could directly compete with us in the market for leasing fiber capacity, if they
are willing to offer this capacity to their customers. In addition, some
communications carriers and local cable companies have extensive networks in
place that could be upgraded to fiber optic cable, as well as numerous personnel
and substantial resources to begin construction to equip their networks. If
communications carriers and local cable companies decide to equip their networks
with fiber optic cable, they could become significant competitors. Our franchise
and other agreements with the city of New York and other local and state
governments are not exclusive. Potential competitors with greater resources and
more experience than us could enter into franchise and other agreements with
local and state governments and compete directly with us. Other companies may
choose to compete with us in our current or planned markets, including Europe,
by leasing fiber capacity, including dark fiber, to our targeted customers. This
additional competition could materially and adversely affect our operations.

WE DEPEND ON A LIMITED NUMBER OF CUSTOMERS AND ARE MORE VULNERABLE TO CHANGING
  ECONOMIC CONDITIONS AND CONSUMER PREFERENCES

    We are particularly dependent on a limited number of customers. In addition,
AboveNet has a long sales cycle. We are, therefore, more susceptible to the
impact of poor economic conditions than our competitors with a more balanced mix
of business.

                                       5
<PAGE>
REGULATION OF THE TELECOMMUNICATIONS INDUSTRY MAY LIMIT THE DEVELOPMENT OF OUR
  NETWORKS AND AFFECT OUR COMPETITIVE POSITION

    Existing and future government laws and regulations may greatly influence
how we operate our business, our business strategy and ultimately, our
viability. U.S. Federal and state telecommunications laws and the laws of
foreign countries in which we operate directly shape the telecommunications
market. Consequently, regulatory requirements and/or changes could adversely
affect our operations and also influence the market for Internet, web hosting
and related services. However, we cannot predict the future regulatory framework
of our business.

    U.S. LAWS MAY IMPACT OUR BUSINESS AND RESULTS OF OPERATIONS BY REGULATING
     OUR OPERATIONS AND OUR CUSTOMERS' OPERATIONS

    U.S. Federal telecommunications law imposes legal requirements on common
carriers who engage in interstate or foreign communication by wire or radio, and
on telecommunications carriers. Should these regulations be applied to us, they
may have a material adverse impact on our business and results of operation. If
providing dark fiber facilities or related services provided by us were deemed
to be a telecommunications service, then regulations, both Federal and state,
applicable to telecommunications carriers might apply to us. This could subject
the revenues we receive from facility leases in interstate commerce to
assessment by the Federal Communications Commission Universal Service Fund and
the offering of those facilities or services would be subject to common carrier
regulation. In addition, our customers and, in the case of Bell Atlantic, one of
our potential shareholders, are local exchange carriers or long distance
carriers, subject to regulation by the Federal Communications Commission. Our
business may be affected by regulations applicable to these telecommunications
carriers. For example, the Federal Communications Commission has recently taken
steps, and may take further steps, to reduce the access charges, the fees paid
by long distance carriers to local exchange carriers for originating and
terminating long distance calls on the local exchange carriers' local networks,
and to give the local exchange carriers greater flexibility in setting these
charges. While we cannot predict the precise effect reduction in access charge
will have on our operations, the reduction will likely make it more attractive
for long distance carriers to use local exchange carriers facilities, rather
than our fiber optic telecommunications network. A recent decision by the
Federal Communications Commission to require unbundling of incumbent local
exchange carriers' dark fiber could decrease the demand for our dark fiber by
allowing our potential customers to obtain dark fiber from incumbent local
exchange carriers at cost-based rates, and thereby have an adverse effect on the
results of our operations.

    STATE LEGISLATION AFFECTS OUR PRICING POLICIES AND OUR COSTS

    Our offering of transmission services, which is different from dark fiber
capacity, may be subject to regulation in each state to the extent that these
services are offered for intrastate use, and this regulation may have an adverse
effect on the results of our operations. We cannot assure you that these
regulations, if any, as well as future regulatory, judicial, or legislative
action will not have a material adverse effect on us. In particular, state
regulators have the authority to determine both the rates we will pay to
incumbent local exchange carriers for certain interconnection arrangements such
as physical collocation, and the prices that incumbent local exchange carriers
will be able to charge our potential customers for services and facilities that
compete with our services. We will also incur costs in order to comply with
regulatory requirements such as the filing of tariffs, submission of periodic
financial and operational reports to regulators, and payment of regulatory fees
and assessments including contributions to state universal service funds. In
some jurisdictions, our pricing flexibility for intrastate services may be
limited because of regulation, although our direct competitors will be subject
to similar restrictions.

                                       6
<PAGE>
    LOCAL GOVERNMENTS' CONTROL OVER RIGHTS-OF-WAY CAN LIMIT THE DEVELOPMENT OF
     OUR NETWORKS

    Local governments exercise legal authority that may have an adverse effect
on our business because of our need to obtain rights-of-way for our fiber
network. While local governments may not prohibit persons from providing
telecommunications services nor treat telecommunication service providers in a
discriminating manner, they can affect the timing and costs associated with our
use of public rights-of-way.

    THE REGULATORY FRAMEWORK FOR OUR INTERNATIONAL OPERATIONS IS EXTENSIVE AND
     CONSTANTLY CHANGING, ADDING UNCERTAINTIES TO OUR PLANNED EXPANSION INTO
     FOREIGN COUNTRIES

    Various regulatory requirements and limitations also will influence our
business as we attempt to enter international markets. Regulation of the
international telecommunications industry is changing rapidly. We are unable to
predict how the Federal Communications Commission and foreign regulatory bodies
will resolve the various pending international policy issues and the effect of
such resolutions on us. Our US/UK undersea cable joint venture is a U.S.
international common carrier subject to U.S. regulation under Title II of the
Communications Act of 1934. We are also licensed as a U.S. international common
carrier subject to U.S. regulation under Title II of the Communications Act of
1934. Our U.K. joint venture is, and we also are, required, under Sections 214
and 203 of the Communications Act of 1934, respectively, to obtain authorization
and file an international service tariff containing rates, terms and conditions
before initiating service. International carriers are also subject to certain
annual fees and filing requirements such as the requirement to file contracts
with other carriers, including foreign carrier agreements, and reports
describing international circuit, traffic and revenue data service. So long as
our U.K. joint venture and we operate as international common carriers, they
will also be required to comply with the rules of the Federal Communications
Commission. The international services provided by our U.K. joint venture are
and our international services are also subject to regulation in the United
Kingdom and other European jurisdictions in which we may operate. National
regulations of relevant European and other foreign countries, as well as
policies and regulations on the European Union and other foreign governmental
level, impose separate licensing, service and other conditions on our foreign
joint ventures and our international service operations, and these requirements
may have a material adverse impact on us.

OUR FRANCHISES, LICENSES OR PERMITS COULD BE CANCELED OR NOT RENEWED, WHICH
  WOULD IMPAIR THE DEVELOPMENT OF MAJOR MARKETS FOR OUR SERVICES

    Termination or non-renewal of our franchise with the city of New York or of
certain other rights-of-way or franchises that we use for our networks would
have a material adverse effect on our business, results of operations and
financial condition. We will also need to obtain additional franchises, licenses
and permits for our planned intracity networks, intercity networks and
international networks. We cannot assure you that we will be able to maintain on
acceptable terms our existing franchises, licenses or permits or to obtain and
maintain the other franchises, licenses or permits needed to implement our
strategy.

WE MAY NOT BE ABLE TO OBTAIN AND MAINTAIN THE RIGHTS-OF-WAY AND OTHER PERMITS
  NECESSARY TO IMPLEMENT OUR BUSINESS STRATEGY

    We must obtain additional rights-of-way and other permits from railroads,
utilities, state highway authorities, local governments and transit authorities
to install underground conduit for the expansion of our intracity networks,
intercity networks and international networks. We cannot assure you that we will
be successful in obtaining and maintaining these right-of-way agreements or
obtaining these agreements on acceptable terms. Some of these agreements may be
short-term or revocable at will, and we cannot assure you that we will continue
to have access to existing rights-of-way after they have expired or terminated.
If any of these agreements were terminated or could not be renewed and we were
forced to remove our fiberoptic cable from under the streets or abandon our
networks, the termination could have a material adverse effect on our
operations. In addition, landowners have asserted that railroad companies and
others

                                       7
<PAGE>
to whom they granted easements to their properties are not entitled as a result
of these easements to grant rights of way to telecommunications providers. If
these disputes are resolved in the landowners' favor, we could be obligated to
make substantial lease payments to these landowners for the lease of these
rights of way. More specifically, our New York/New Jersey network relies upon,
and our planned expansions into Long Island and Westchester County will rely
upon, right-of-way agreements with Bell Atlantic Corporation and our subsidiary,
Empire City Subway Company (Ltd.). The current agreements may be terminated at
any time without cause with three months notice. In case of termination, we may
be required to remove our fiber optic cable from the conduits or poles of Bell
Atlantic. This termination would have a material adverse effect on our
operations.

RAPID TECHNOLOGICAL CHANGES COULD AFFECT THE CONTINUED USE OF OUR SERVICES AND
  OUR RESULTS OF OPERATIONS

    The telecommunications industry is subject to rapid and significant changes
in technology that could materially affect the continued use of our services,
including fiber optic cable and Internet connectivity services. We cannot
predict the effect of technological changes on our business. We also cannot
assure you that technological changes in the communications industry and
Internet related industry will not have a material adverse effect on our
operations.

WE MAY EXPERIENCE RISKS AS A RESULT OF EXPANDING OUR NETWORKS INTO EUROPEAN AND
  OTHER FOREIGN COUNTRIES, WHICH MAY ADVERSELY AFFECT OUR RESULTS OF OPERATIONS

    Our strategy includes expanding our services to provide fiber optic cable
and developing regional Internet service exchange facilities in Europe,
particularly Austria, Germany and the United Kingdom. The following are risks we
may experience as a result of doing business in Germany, the United Kingdom and
other foreign countries in which we may expand our networks:

    - difficulties in staffing and managing our operations in foreign countries;

    - longer payment cycles;

    - problems in collecting accounts receivable;

    - fluctuations in currency exchange rates;

    - delays from customs brokers or government agencies encountered as a result
      of exporting fiber from the United States to Germany, the United Kingdom
      or other countries in which we may operate; and

    - potentially adverse consequences resulting from operating in multiple
      countries, such as Germany and the United Kingdom, each with their own
      laws and regulations, including tax laws and industry related regulations.

    We cannot assure you that we will be successful in overcoming these risks or
any other problems arising because of expansion into Europe and other foreign
countries.

WE MAY NOT BE ABLE TO SUCCESSFULLY IDENTIFY, MANAGE AND ASSIMILATE FUTURE
  ACQUISITIONS, INVESTMENTS AND STRATEGIC ALLIANCES, WHICH WOULD ADVERSELY
  AFFECT OUR RESULTS OF OPERATIONS

    We have in the past, and may in the future, acquire, make investments in, or
enter into strategic alliances, including joint ventures in which we hold less
than a majority interest, with, companies which have customer bases, switching
capabilities, existing networks or other assets in our current markets or in
areas into which we intend to expand our networks. Any acquisitions,
investments, strategic alliances or related efforts will be accompanied by risks
such as:

    - the difficulty of identifying appropriate acquisition candidates;

                                       8
<PAGE>
    - the difficulty of assimilating the operations of the respective entities;

    - the potential disruption of our ongoing business;

    - the potential inability to control joint ventures in which we hold less
      than a majority interest;

    - the inability of management to capitalize on the opportunities presented
      by acquisitions, investments, strategic alliances or related efforts;

    - the failure to successfully incorporate licensed or acquired technology
      and rights into our services;

    - the inability to maintain uniform standards, controls, procedures and
      policies; and

    - the impairment of relationships with employees and customers as a result
      of changes in management.

    We cannot assure you that we would be successful in overcoming these risks
or any other problems encountered with such acquisitions, investments, strategic
alliances or related efforts.

IN THE TELECOMMUNICATIONS INDUSTRY, CONTINUED PRICING PRESSURES FROM OUR
  COMPETITORS AND AN EXCESS OF NETWORK CAPACITY CONTINUE TO CAUSE PRICES FOR OUR
  SERVICES TO DECLINE

    We anticipate that prices for our services specifically, and transmission
services in general, will continue to decline over the next several years due
primarily to the following:

    - price competition as various network providers continue to install
      networks that might compete with our networks;

    - recent technological advances that permit substantial increases in the
      transmission capacity of both new and existing fiber; and

    - strategic alliances or similar transactions, such as long distance
      capacity purchasing alliances among regional Bell operating companies,
      that increase the parties' purchasing power.

WE MAY EXPERIENCE ADDITIONAL RISKS AS A RESULT OF ABOVENET'S CO-LOCATION AND
  INTERNET CONNECTIVITY SERVICES

    The legal landscape that governs AboveNet has yet to be interpreted or
enforced. Regulatory issues for AboveNet's industry include property ownership,
copyrights and other intellectual property issues, taxation, libel, obscenity
and personal privacy. AboveNet's business may be adversely affected by the
adoption and interpretation of any future or currently existing laws and
regulations. AboveNet has no patented technology and relies on a combination of
copyright, trademark, service mark and trade secret laws and contractual
restrictions to establish and protect certain proprietary rights in its
technology. Despite AboveNet's design and implementation of a variety of network
security measures, unauthorized access, computer viruses, accidental or
intentional action and other disruptions could occur. In addition, we may incur
significant costs to prevent breaches in AboveNet's security or to alleviate
problems caused by those breaches. The law relating to the liability of online
services companies and Internet access providers for information carried on or
disseminated through their networks is currently unsettled. It is possible that
claims could be made against online services companies, co-location companies
and Internet access providers. We may need to implement measures to reduce our
exposure to this potential liability.

METROMEDIA COMPANY EFFECTIVELY CONTROLS OUR COMPANY AND HAS THE POWER TO CAUSE
  OR PREVENT A CHANGE OF CONTROL

    Metromedia Company and one of its general partners currently own 100% of our
class B common stock, which currently represents approximately 63% of our total
voting power and also is entitled to elect 75% of the members of our board of
directors. Accordingly, Metromedia Company is able to control the

                                       9
<PAGE>
board of directors and all stockholder decisions and, in general, to determine
the outcome of any corporate transaction or other matter submitted to the
stockholders for approval, including mergers, consolidations and the sale of all
or substantially all of our assets, without the consent of other stockholders.
In addition, Metromedia Company has the power to prevent or cause a change in
control of our company.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

    Any statements in this prospectus about our expectations, belief, plans,
objectives, assumptions or future events or performance are not historical facts
and are forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933, as amended, and Section 21E of the Securities Exchange
Act of 1934, as amended. These statements are often, but not always, made
through the use of words or phrases such as "will likely result," "expect,"
"will continue," "anticipate," "estimate," "intend," "plan," "projection,"
"would" and "outlook." Accordingly, these statements involve estimates,
assumptions and uncertainties which could cause actual results to differ
materially from those expressed in them. Any forward-looking statements are
qualified in their entirety by reference to the factors discussed throughout
this document. The following cautionary statements identify important factors
that could cause our actual results to differ materially from those projected in
the forward-looking statements made in this document. Among the key factors that
have a direct bearing on our results of operation are:

    - general economic and business conditions;

    - the existence or absence of adverse publicity;

    - changes in, or failure to comply with, government regulations;

    - changes in marketing and technology;

    - changes in political, social and economic conditions, especially with
      respect to our foreign operations;

    - competition in the telecommunications industry;

    - industry capacity;

    - general risks of the telecommunications industries;

    - success of acquisition and operating initiatives, including our ability to
      successfully integrate our acquisitions;

    - changes in business strategy or development plans;

    - management of growth;

    - availability, terms and deployment of capital;

    - construction schedules;

    - costs and other effects of legal and administrative proceedings;

    - dependence on senior management;

    - business abilities and judgments of personnel;

    - availability of qualified personnel; and

    - labor and employee benefit costs.

    These factors and the risk factors referred to above could cause actual
results or outcomes to differ materially from those expressed in any
forward-looking statements made by us. You should not place undue reliance on
any such forward-looking statements. Further, any forward-looking statement
speaks only as of the date on which it is made and we undertake no obligation to
update any forward-looking

                                       10
<PAGE>
statement or statements to reflect events or circumstances after the date on
which such statement is made or to reflect the occurrence of unanticipated
events. New factors emerge from time to time, and it is not possible for us to
predict which will arise. In addition, we cannot assess the impact of each
factor on our business or the extent to which any factor, or combination of
factors, may cause actual results to differ materially from those contained in
any forward-looking statements.

    For a discussion of important risks of an investment in our securities,
including factors that could cause actual results to differ materially from
results referred to in the forward-looking statements, see "Risk Factors." You
should carefully consider the information set forth under the caption "Risk
Factors." In light of these risks, uncertanities and assumptions, the
forward-looking events discussed in or incorporated by reference in this
prospectus might not occur.

                             ABOUT THIS PROSPECTUS

    This prospectus is part of a registration statement that we filed with the
SEC utilizing a "shelf" registration process. Under this shelf process, we may,
over the next two years, sell any combination of the securities described in
this prospectus in one or more offerings up to a total dollar amount of
$1,500,000,000. In addition, the selling stockholders may, over the next two
years, sell up to 21,505,376 shares of class A common stock.

    This prospectus provides you with a general description of the securities we
or the selling stockholders may offer. Each time we or the selling stockholders
sell securities, we will provide a prospectus supplement that will contain
specific information about the terms of that offering. The prospectus supplement
may also add, update or change information contained in this prospectus. You
should read both this prospectus and any prospectus supplement together with
additional information described immediately below under the heading "Where You
Can Find More Information."

                                    BUSINESS

    We are a facilities-based provider of technologically advanced,
high-bandwidth, fiber optic communications infrastructure to carrier and
corporate/government customers in the United States and Europe. We have
installed and intend to install local intracity networks that will consist of in
excess of 2.9 million fiber miles, which is equal to the number of strands of
fiber in a length of fiber optic cable multiplied by the length of the cable in
miles, covering approximately 6,941 route miles, which is equal to the number of
miles spanned by fiber optic cable calculated without including physically
overlapping segments of cable, in 50 metropolitan markets in the United States
and Europe.

    We focus on leasing or otherwise making available for use our broadband
communications infrastructure to two main customer groups: communications
carriers and corporate/governmental customers. In addition, through our
subsidiary AboveNet Communications Inc., we are providing facilities-based,
managed services for customer-owned webservers and related equipment, known as
co-location, and high performance Internet connectivity solutions for electronic
commerce and other business critical Internet operations. AboveNet has developed
a network architecture based upon strategically located facilities. These
facilities, known as Internet service exchanges, allow Internet content
providers direct access to Internet service providers.

    Our company was founded in 1993 and is a Delaware corporation and its
executive offices are located at One North Lexington Avenue, White Plains, NY
10601.

                                       11
<PAGE>
        RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

    The following table sets forth our consolidated ratio of earnings to fixed
charges, the deficiency of our consolidated earnings to cover fixed charges, our
consolidated ratio of earnings to combined fixed charges and preferred stock
dividends and the deficiency of our consolidated earnings to cover combined
fixed charges and preferred stock dividends for the periods indicated. We have
no preferred stock outstanding as of October 14, 1999.

<TABLE>
<CAPTION>
                                                                                               SIX MONTHS
                                                        YEARS ENDED                               ENDED
                                                        DECEMBER 31,                            JUNE 30,
                                    ----------------------------------------------------   -------------------
                                      1994       1995       1996       1997       1998       1998       1999
                                    --------   --------   --------   --------   --------   --------   --------
                                               (IN THOUSANDS OF DOLLARS, EXCEPT RATIOS)
<S>                                 <C>        <C>        <C>        <C>        <C>        <C>        <C>
Consolidated ratio of earnings to
  fixed charges...................      --          --         --         --       1.61         --         --
Deficiency of consolidated
  earnings to cover fixed
  charges.........................    $874      $4,319    $10,359    $26,259         --     $2,056    $12,278
Consolidated ratio of earnings to
  combined fixed charges and
  preferred stock dividends.......      --          --         --         --       1.61         --         --
Deficiency of consolidated
  earnings to cover combined fixed
  charges and preferred stock
  dividends.......................    $874      $4,319    $10,359    $26,259         --     $2,056    $12,278
</TABLE>

    For purposes of computing the ratios of earnings to fixed charges and
earnings to combined fixed charges and preferred stock dividends, earnings
represent income (loss) before income taxes and fixed charges. Fixed charges
consist of interest expense, the interest component of operating leases and
amortization of deferred financing costs.

                                USE OF PROCEEDS

    We will use the net proceeds from our sale of the securities for the
development, engineering, construction, installation, acquisition, lease,
development or improvement of our telecommunications assets and for our general
corporate purposes, which may include, repaying indebtedness, making additions
to our working capital, funding future acquisitions or for any other purpose we
describe in the applicable prospectus supplement.

    We will not receive any of the proceeds from the sale of class A common
stock or other securities that may be sold by selling stockholders.

                                       12
<PAGE>
                         DESCRIPTION OF DEBT SECURITIES

    The following is a summary of the general terms of the debt securities. We
will file a prospectus supplement that may contain additional terms when we
issue debt securities. The terms presented here, together with the terms in a
related prospectus supplement, which could be different from the terms described
below, will be a description of the material terms of the debt securities. You
should also read the indenture. We have filed the indenture with the SEC as an
exhibit to the registration statement of which this prospectus is a part. All
capitalized terms have the meanings specified in the Indenture. The terms and
provisions of the debt securities below will most likely be modified by the
documents that set forth the specific terms of the debt securities issued.

    We may issue, from time to time, debt securities, in one or more series,
that will consist of either our senior debt ("Senior Debt Securities"), our
senior subordinated debt ("Senior Subordinated Debt Securities"), our
subordinated debt ("Subordinated Debt Securities") or our junior subordinated
debt ("Junior Subordinated Debt Securities" and, together with the Senior
Subordinated Debt Securities and the Subordinated Debt Securities, the
"Subordinated Securities"). The debt securities we offer will be issued under an
indenture between us and the trustee. Debt securities, whether senior, senior
subordinated, subordinated or junior subordinated, may be issued as convertible
debt securities or exchangeable debt securities.

GENERAL TERMS OF THE INDENTURE

    The indenture does not limit the amount of debt securities that we may
issue. It provides that we may issue debt securities up to the principal amount
that we may authorize and may be in any currency or currency unit that we may
designate. The terms of the indenture do not contain any covenants or other
provisions designed to give holders of any debt securities protection against
changes in our operations, financial condition or transactions involving us, but
such provisions may be included in the documents that set forth the specific
terms of the debt securities.

    We may issue the debt securities issued under the indenture as "discount
securities," which means they may be sold at a discount below their stated
principal amount. These debt securities, as well as other debt securities that
are not issued at a discount, may, for United States federal income tax
purposes, be treated as if they were issued with "original issue discount"
("OID") because of interest payment and other characteristics. Special United
States federal income tax considerations applicable to debt securities issued
with original issue discount will be described in more detail in any applicable
prospectus supplement.

    The applicable prospectus supplement for a series of debt securities that we
issue will describe, among other things, the following terms of the offered debt
securities:

    -  the title;

    -  any limit on the aggregate principal amount;

    -  whether issued in fully registered form without coupons or in a form
       registered as to principal only with coupons or in bearer form with
       coupons;

    -  whether issued in the form of one or more global securities and whether
       all or a portion of the principal amount of the debt securities is
       represented thereby;

    -  the price or prices at which the debt securities will be issued;

    -  the date or dates on which principal is payable;

    -  the place or places where and the manner in which principal, premium or
       interest will be payable and the place or places where the debt
       securities may be presented for transfer and, if applicable, conversion
       or exchange;

                                       13
<PAGE>
    -  interest rates, and the dates from which interest, if any, will accrue,
       and the dates when interest is payable and the maturity;

    -  the right, if any, to extend the interest payment periods and the
       duration of the extensions;

    -  our rights or obligations to redeem or purchase the debt securities;

    -  any sinking fund provisions;

    -  conversion or exchange provisions, if any, including conversion or
       exchange prices or rates and adjustments thereto;

    -  the currency or currencies of payment of principal or interest;

    -  the terms applicable to any debt securities issued at a discount from
       their stated principal amount;

    -  the terms, if any, under which any debt securities will rank junior to
       any of our other debt;

    -  if the amount of payments of principal or interest is to be determined by
       reference to an index or formula, or based on a coin or currency other
       than that in which the debt securities are stated to be payable, the
       manner in which these amounts are determined and the calculation agent,
       if any, with respect thereto;

    -  if other than the entire principal amount of the debt securities when
       issued, the portion of the principal amount payable upon acceleration of
       maturity as a result of a default on our obligations;

    -  if applicable, covenants affording holders of debt protection against
       changes in our operations, financial condition or transactions involving
       us;

    -  if other than dollars, the coin, currency or currencies in which the
       series of debt securities are denominated; and

    -  any other specific terms of any debt securities.

    The applicable prospectus supplement will present United States federal
income tax considerations for holders of any debt securities and the securities
exchange or quotation system on which any debt securities are listed or quoted.

SENIOR DEBT SECURITIES

    Payment of the principal of, premium, if any, and interest on Senior Debt
Securities will rank on a parity with all of our other unsecured and
unsubordinated debt.

SENIOR SUBORDINATED DEBT SECURITIES

    Payment of the principal of, premium, if any, and interest on Senior
Subordinated Debt Securities will be junior in right of payment to the prior
payment in full of all of our unsubordinated debt, including Senior Debt
Securities. We will state in the applicable prospectus supplement relating to
any Senior Subordinated Debt Securities the subordination terms of the
securities as well as the aggregate amount of outstanding debt, as of the most
recent practicable date, that by its terms would be senior to the Senior
Subordinated Debt Securities. We will also state in such prospectus supplement
limitations, if any, on issuance of additional senior debt.

SUBORDINATED DEBT SECURITIES

    Payment of the principal of, premium, if any, and interest on Subordinated
Debt Securities will be subordinated and junior in right of payment to the prior
payment in full of all of our senior debt, including

                                       14
<PAGE>
our senior subordinated debt. We will state in the applicable prospectus
supplement relating to any Subordinated Debt Securities the subordination terms
of the securities as well as the aggregate amount of outstanding indebtedness,
as of the most recent practicable date, that by its terms would be senior to the
Subordinated Debt Securities. We will also state in such prospectus supplement
limitations, if any, on issuance of additional senior indebtedness.

JUNIOR SUBORDINATED DEBT SECURITIES

    Payment of the principal of, premium, if any, and interest on Junior
Subordinated Debt Securities will be subordinated and junior in right of payment
to the prior payment in full of all of our senior, senior subordinated and
subordinated debt. We will state in the applicable prospectus supplement
relating to any Junior Subordinated Debt Securities the subordination terms of
the securities as well as the aggregate amount of outstanding debt, as of the
most recent practicable date, that by its terms would be senior to the Junior
Subordinated Debt Securities. We will also state in such prospectus supplement
limitations, if any, on issuance of additional senior indebtedness.

CONVERSION OR EXCHANGE RIGHTS

    Debt securities may be convertible into or exchangeable for shares of our
equity securities or equity securities of our subsidiaries or affiliates. The
terms and conditions of conversion or exchange will be stated in the applicable
prospectus supplement. The terms will include, among others, the following:

    -  the conversion or exchange price;

    -  the conversion or exchange period;

    -  provisions regarding the convertibility or exchangeability of the debt
       securities, including who may convert or exchange;

    -  events requiring adjustment to the conversion or exchange price;

    -  provisions affecting conversion or exchange in the event of our
       redemption of the debt securities; and

    -  any anti-dilution provisions, if applicable.

EVENTS OF DEFAULT

    Unless otherwise provided for in the prospectus supplement, the term "Event
of Default," when used in the indenture, unless otherwise indicated, means any
of the following:

    -  failure to pay interest for 30 days after the date payment is due and
       payable; provided that if we extend an interest payment period in
       accordance with the terms of the debt securities, the extension will not
       be a failure to pay interest;

    -  failure to pay principal or premium, if any, on any debt security when
       due, either at maturity, upon any redemption, by declaration or
       otherwise;

    -  failure to make sinking fund payments when due;

    -  failure to perform other covenants for 60 days after notice that
       performance was required;

    -  events in bankruptcy, insolvency or reorganization of our company; or

    -  any other Event of Default provided in the applicable resolution of our
       Board or the supplemental indenture under which we issue a series of debt
       securities.

    An Event of Default for a particular series of debt securities does not
necessarily constitute an Event of Default for any other series of debt
securities issued under the indenture. IF AN EVENT OF DEFAULT RELATING

                                       15
<PAGE>
TO THE PAYMENT OF INTEREST, PRINCIPAL OR ANY SINKING FUND INSTALLMENT INVOLVING
ANY SERIES OF DEBT SECURITIES HAS OCCURRED AND IS CONTINUING, THE TRUSTEE OR THE
HOLDERS OF NOT LESS THAN 25% IN AGGREGATE PRINCIPAL AMOUNT OF THE DEBT
SECURITIES OF EACH AFFECTED SERIES MAY DECLARE THE ENTIRE PRINCIPAL OF ALL THE
DEBT SECURITIES OF THAT SERIES TO BE DUE AND PAYABLE IMMEDIATELY.

    If an Event of Default relating to the performance of other covenants occurs
and is continuing for a period of 60 days after notice of such, or if any other
Event of Default occurs and is continuing involving all of the series of Senior
Debt Securities, then the trustee or the holders of not less than 25% in
aggregate principal amount of all of the series of Senior Debt Securities may
declare the entire principal amount of all of the series of Senior Debt
Securities due and payable immediately.

    Similarly, if an Event of Default relating to the performance of other
covenants occurs and is continuing for a period of 60 days after notice of such,
or if any other Event of Default occurs and is continuing involving all of the
series of Subordinated Securities, then the trustee or the holders of not less
than 25% in aggregate principal amount of all of the series of Subordinated
Securities may declare the entire principal amount of all of the series of
Subordinated Securities due and payable immediately.

    If, however, the Event of Default relating to the performance of other
covenants or any other Event of Default that has occurred and is continuing is
for less than all of the series of Senior Debt Securities or Subordinated
Securities, as the case may be, then, the trustee or the holders of not less
than 25% in aggregate principal amount of each affected series of the Senior
Debt Securities or the Subordinated Securities, as the case may be, may declare
the entire principal amount of all debt securities of such affected series due
and payable immediately. The holders of not less than a majority, or any
applicable supermajority, in aggregate principal amount of the debt securities
of a series may, after satisfying conditions, rescind and annul any of the
above-described declarations and consequences involving the series.

    If an Event of Default relating to events in bankruptcy, insolvency or
reorganization of our company occurs and is continuing, then the principal
amount of all of the debt securities outstanding, and any accrued interest, will
automatically become due and payable immediately, without any declaration or
other act by the trustee or any holder.

    The indenture imposes limitations on suits brought by holders of debt
securities against us. Except for actions for payment of overdue principal or
interest, no holder of debt securities of any series may institute any action
against us under the indenture unless:

    -  the holder has previously given to the trustee written notice of default
       and continuance of such default,

    -  the holders of at least 25% in principal amount of the outstanding debt
       securities of the affected series have requested that the trustee
       institute the action,

    -  the requesting holders have offered the trustee reasonable indemnity for
       expenses and liabilities that may be incurred by bringing the action,

    -  the trustee has not instituted the action within 60 days of the request,
       and

    -  the trustee has not received inconsistent direction by the holders of a
       majority in principal amount of the outstanding debt securities of the
       series.

    We will be required to file annually with the trustee a certificate, signed
by an officer of our company, stating whether or not the officer knows of any
default by us in the performance, observance or fulfillment of any condition or
covenant of the indenture.

                                       16
<PAGE>
REGISTERED GLOBAL SECURITIES

    We may issue the debt securities of a series in whole or in part in the form
of one or more fully registered global securities. We will deposit any
registered global securities with a depositary or with a nominee for a
depositary identified in the applicable prospectus supplement and registered in
the name of such depositary or nominee. In such case, we will issue one or more
registered global securities denominated in an amount equal to the aggregate
principal amount of all of the debt securities of the series to be issued and
represented by such registered global security or securities.

    Unless and until it is exchanged in whole or in part for debt securities in
definitive registered form, a registered global security may not be transferred
except as a whole:

    -  by the depositary for such registered global security to its nominee,

    -  by a nominee of the depositary to the depositary or another nominee of
       the depositary, or

    -  by the depositary or its nominee to a successor of the depositary or a
       nominee of the successor.

    The prospectus supplement relating to a series of debt securities will
describe the specific terms of the depositary arrangement involving any portion
of the series represented by a registered global security.

    We anticipate that the following provisions will apply to all depositary
arrangements for debt securities:

    -  ownership of beneficial interests in a registered global security will be
       limited to persons that have accounts with the depositary for such
       registered global security, these persons being referred to as
       "participants," or persons that may hold interests through participants;

    -  upon the issuance of a registered global security, the depositary for the
       registered global security will credit, on its book-entry registration
       and transfer system, the participants' accounts with the respective
       principal amounts of the debt securities represented by the registered
       global security beneficially owned by the participants;

    -  any dealers, underwriters, or agents participating in the distribution of
       the debt securities will designate the accounts to be credited; and

    -  ownership of beneficial interest in such registered global security will
       be shown on, and the transfer of such ownership interest will be effected
       only through, records maintained by the depositary for such registered
       global security for interests of participants, and on the records of
       participants for interests of persons holding through participants.

    The laws of some states may require that specified purchasers of securities
take physical delivery of the securities in definitive form. These laws may
limit the ability of those persons to own, transfer or pledge beneficial
interests in registered global securities.

    So long as the depositary for a registered global security, or its nominee,
is the registered owner of such registered global security, the depositary or
such nominee, as the case may be, will be considered the sole owner or holder of
the debt securities represented by the registered global security for all
purposes under the indenture. Except as stated below, owners of beneficial
interests in a registered global security:

    -  will not be entitled to have the debt securities represented by a
       registered global security registered in their names,

    -  will not receive or be entitled to receive physical delivery of the debt
       securities in the definitive form, and

    -  will not be considered the owners or holders of the debt securities under
       the Indenture.

                                       17
<PAGE>
    Accordingly, each person owning a beneficial interest in a registered global
security must rely on the procedures of the depositary for the registered global
security and, if the person is not a participant, on the procedures of a
participant through which the person owns its interest, to exercise any rights
of a holder under the indenture.

    We understand that under existing industry practices, if we request any
action of holders or if an owner of a beneficial interest in a registered global
security desires to give or take any action that a holder is entitled to give or
take under the indenture, the depositary for the registered global security
would authorize the participants holding the relevant beneficial interests to
give or take the action, and the participants would authorize beneficial owners
owning through the participants to give or take the action or would otherwise
act upon the instructions of beneficial owners holding through them.

    We will make payments of principal and premium, if any, and interest, if
any, on debt securities represented by a registered global security registered
in the name of a depositary or its nominee to the depositary or its nominee, as
the case may be, as the registered owners of the registered global security.
None of our company, the trustee or any other agent of our company or the
trustee will be responsible or liable for any aspect of the records relating to,
or payments made on account of, beneficial ownership interests in the registered
global security or for maintaining, supervising or reviewing any records
relating to the beneficial ownership interests.

    We expect that the depositary for any debt securities represented by a
registered global security, upon receipt of any payments of principal and
premium, if any, and interest, if any, in respect of the registered global
security, will immediately credit participants' accounts with payments in
amounts proportionate to their respective beneficial interests in the registered
global security as shown on the records of the depositary. We also expect that
standing customer instructions and customary practices will govern payments by
participants to owners of beneficial interests in the registered global security
held through the participants, as is now the case with the securities held for
the accounts of customers in bearer form or registered in "street name." We also
expect that any of these payments will be the responsibility of the
participants.

    If the depositary for any debt securities represented by a registered global
security is at any time unwilling or unable to continue as depositary or stops
being a clearing agency registered under the Exchange Act, we will appoint an
eligible successor depositary. If we fail to appoint an eligible successor
depositary within 90 days, we will issue the debt securities in definitive form
in exchange for the registered global security. In addition, we may at any time
and in our sole discretion decide not to have any of the debt securities of a
series represented by one or more registered global securities. In that event,we
will issue debt securities of the series in a definitive form in exchange for
all of the registered global securities representing the debt securities. The
trustee will register any debt securities issued in definitive form in exchange
for a registered global security in the name or names as the depositary, based
upon instructions from its participants, shall instruct the trustee.

    We may also issue bearer debt securities of a series in the form of one or
more global securities, referred to as "bearer global securities." We will
deposit these securities with a common depositary for Euroclear System and
CedelBank, SOCIETE ANONYME, or with a nominee for the depositary identified in
the prospectus supplement relating to the series. The prospectus supplement
relating to a series of debt securities represented by a bearer global security
will describe the applicable terms and procedures. These will include the
specific terms of the depositary arrangement and any specific procedures for the
issuance of debt securities in definitive form in exchange for a bearer global
security, in proportion to the series represented by a bearer global security.

DISCHARGE, DEFEASANCE AND COVENANT DEFEASANCE

    We can discharge or defease our obligations under the indenture as stated
below or as provided in the prospectus supplement.

                                       18
<PAGE>
    Unless otherwise provided in the applicable prospectus supplement, we may
discharge obligations to holders of any series of debt securities that have not
already been delivered to the trustee for cancellation and that have either
become due and payable or are by their terms to become due and payable, or are
scheduled for redemption, within one year. We may effect a discharge by
irrevocably depositing with the trustee cash or U.S. government obligations, as
trust funds, in an amount certified to be enough to pay when due, whether at
maturity, upon redemption or otherwise, the principal of, premium, if any, and
interest on the debt securities and any mandatory sinking fund payments.

    Unless otherwise provided in the applicable prospectus supplement, we may
also discharge any and all of our obligations to holders of any series of debt
securities at any time ("defeasance"). We may also be released from the
obligations imposed by any covenants of any outstanding series of debt
securities and provisions of the indenture, and we may omit to comply with those
covenants without creating an event of default under the trust declaration
("covenant defeasance"). We may effect defeasance and covenant defeasance only
if, among other things:

    -  we irrevocably deposit with the trustee cash or U.S. government
       obligations, as trust funds, in an amount certified to be enough to pay
       at maturity, or upon redemption, the principal, premium, if any, and
       interest on all outstanding debt securities of the series;

    -  we deliver to the trustee an opinion of counsel from a nationally
       recognized law firm to the effect that (i) in the case of covenant
       defeasance, the holders of the series of debt securities will not
       recognize income, gain or loss for U.S. federal income tax purposes as a
       result of such defeasance, and will be subject to tax in the same manner
       and at the same times as if no covenant defeasance had occurred and
       (ii) in the case of defeasance, either we have received from, or there
       has been published by, the Internal Revenue Service a ruling or there has
       been a change in applicable U.S. federal income tax law, and based
       thereon, the holders of the series of debt securities will not recognize
       income, gain or loss for U.S. federal income tax purposes as a result of
       such defeasance, and will be subject to tax in the same manner as if no
       defeasance had occurred; and

    -  in the case of subordinated debt securities, no event or condition shall
       exist that, based on the subordination provisions applicable to the
       series, would prevent us from making payments of principal of, premium,
       if any, and interest on any of the applicable subordinated debt
       securities at the date of the irrevocable deposit referred to above or at
       any time during the period ending on the 91st day after the deposit date.

    Although we may discharge or decrease our obligations under the indenture as
described in the two preceding paragraphs, we may not avoid, among other things,
our duty to register the transfer or exchange of any series of debt securities,
to replace any temporary, mutilated, destroyed, lost or stolen series of debt
securities or to maintain an office or agency in respect of any series of debt
securities.

MODIFICATION OF THE INDENTURE

    Except as provided in the prospectus supplement, the indenture provides that
we and the trustee may enter into supplemental indentures without the consent of
the holders of debt securities to:

    -  secure any debt securities,

    -  evidence the assumption by a successor corporation of our obligations,

    -  add covenants for the protection of the holders of debt securities,

    -  cure any ambiguity or correct any inconsistency in the Indenture,

    -  establish the forms or terms of debt securities of any series, and

    -  evidence and provide for the acceptance of appointment by a successor
       trustee.

                                       19
<PAGE>
    The indenture also provides that we and the trustee may, with the consent of
the holders of not less than a majority in aggregate principal amount of debt
securities of all series of Senior Debt Securities or of Subordinated
Securities, as the case may be, then outstanding and affected, voting as one
class, add any provisions to, or change in any manner, eliminate or modify in
any way the provisions of, the indenture or modify in any manner the rights of
the holders of the debt securities. We and the trustee may not, however, without
the consent of the holder of each outstanding debt security affected thereby:

    -  extend the final maturity of any debt security;

    -  reduce the principal amount or premium, if any;

    -  reduce the rate or extend the time of payment of interest;

    -  reduce any amount payable on redemption;

    -  change the currency in which the principal, unless otherwise provided for
       a series, premium, if any, or interest is payable;

    -  reduce the amount of the principal of any debt security issued with an
       original issue discount that is payable upon acceleration or provable in
       bankruptcy;

    -  impair the right to institute suit for the enforcement of any payment on
       any debt security when due; or

    -  reduce the percentage of holders of debt securities of any series whose
       consent is required for any modification of the indenture.

CONCERNING THE TRUSTEE

    The indenture provides that there may be more than one trustee under the
indenture, each for one or more series of debt securities. If there are
different trustees for different series of debt securities, each trustee will be
a trustee of a Trust under the indenture separate and apart from the trust
administered by any other trustee under the indenture. Except as otherwise
indicated in this prospectus or any prospectus supplement, any action permitted
to be taken by a trustee may be taken by such trustee only on the one or more
series of debt securities for which it is the trustee under the indenture. Any
trustee under the indenture may resign or be removed from one or more series of
debt securities. All payments of principal of, premium, if any, and interest on,
and all registration, transfer, exchange, authentication and delivery of, the
debt securities of a series will be effected by the trustee for such series at
an office designated by such trustee in New York, New York.

    If the trustee becomes a creditor of our company, the indenture places
limitations on the right of the trustee to obtain payment of claims or to
realize on property received in respect of any such claim as security or
otherwise. The trustee may engage in other transactions. If it acquires any
conflicting interest relating to any duties concerning the debt securities,
however, it must eliminate the conflict or resign as trustee.

    The holders of a majority in aggregate principal amount of any series of
debt securities then outstanding will have the right to direct the time, method
and place of conducting any proceeding for exercising any remedy available to
the trustee concerning the applicable series of debt securities, provided that
the direction:

    -  would not conflict with any rule of law or with the indenture,

    -  would not be unduly prejudicial to the rights of another holder of the
       debt securities, and

    -  would not involve any trustee in personal liability.

                                       20
<PAGE>
    The indenture provides that in case an Event of Default shall occur, not be
cured and be known to any trustee, the trustee must use the same degree of care
as a prudent person would use in the conduct of his or her own affairs in the
exercise of the Trust's power. The trustee will be under no obligation to
exercise any of its rights or powers under the indenture at the request of any
of the holders of the debt securities, unless they shall have offered to the
trustee security and indemnity satisfactory to the trustee.

NO INDIVIDUAL LIABILITY OF INCORPORATORS, SHAREHOLDERS, OFFICERS OR DIRECTORS

    The indenture provides that no incorporator and no past, present or future
shareholder, officer or director of our company or any successor corporation in
their capacity as such shall have any individual liability for any of our
obligations, covenants or agreements under the debt securities or the indenture.

GOVERNING LAW

    The indenture and the debt securities will be governed by, and construed in
accordance with, the laws of the State of New York.

                                       21
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK

    Our authorized capital stock consists of 2,404,031,240 shares of class A
common stock, par value $.01 per share, 522,254,782 shares of class B common
stock, par value $.01 per share, and 20,000,000 shares of preferred stock, par
value $.01 per share. As of October 4, 1999 there were 198,835,335 shares of
class A common stock outstanding, 33,769,272 shares of class B common stock
outstanding and no shares of preferred stock outstanding.

COMMON STOCK

    The shares of class A common stock and class B common stock are identical in
all respects, except for different voting rights described below and conversion
rights and restrictions on transfer applicable only to the class B common stock
that we also describe below.

    VOTING RIGHTS.  The holders of class A common stock are entitled to one vote
per share. Holders of class B common stock are entitled to ten votes per share.
Holders of all classes of common stock are entitled to vote together as a single
class on all matters presented to our stockholders for their vote or approval
except for the election and the removal of directors and as otherwise required
by applicable law. With respect to the election of directors, our amended and
restated certificate of incorporation provides that holders of class B common
stock vote as a separate class to elect at least 75% of the members of our
board.

    Directors may be removed, with or without cause, only by the holders of the
class of common stock or series of preferred stock that, as of the date such
removal is effected, would be entitled to elect such director at the next annual
meeting of stockholders. Vacancies in a directorship may be filled only by

    - the remaining directors elected by holders of each class of common stock
      or series of preferred stock that elected such director and as of the date
      such vacancy is filled, would be entitled to elect such director at the
      next annual meeting of the stockholders; or

    - if there are no such remaining directors, then by the vote of the holders
      of the class or classes of common stock or series of preferred stock,
      that, as of the date such vacancy is filled, would be entitled to elect
      such director at the next annual meeting of stockholders, voting as a
      separate class at a meeting, special or otherwise, of the holders of
      common stock of such class or series of preferred stock.

    DIVIDENDS.  Holders of class A common stock and the class B common stock are
entitled to receive dividends at the same rate if, as and when such dividends
are declared by our board out of assets legally available therefor after payment
of dividends required to be paid on shares of outstanding preferred stock. We
may not make any dividend or distribution to any holder of any class of common
stock unless simultaneously with such dividend or distribution we make the same
dividend or distribution with respect to each outstanding share of common stock
regardless of class. In the case of a dividend or other distribution payable in
shares of class of common stock, including distributions pursuant to stock
splits or divisions of common stock, only shares of class A common stock may be
distributed with respect to class A common stock and only shares of class B
common stock may be distributed with respect to class B common stock. Whenever a
dividend or distribution, including distributions pursuant to stock splits or
divisions of the common stock, is payable in shares of a class of common stock,
the number of shares of each class of common stock payable per share of such
class of common stock will be equal in number. In the case of dividends or other
distributions consisting of our other voting securities or of voting securities
of any corporation which is our wholly-owned subsidiary, we will declare and pay
such dividends in two separate classes of such voting securities, identical in
all respects except that:

    - the voting rights of each security issued to the holders of class A common
      stock will be one-tenth of the voting rights of each security issued to
      holders of class B common stock;

                                       22
<PAGE>
    - such security issued to holders of class B common stock will convert into
      the security issued to the holders of class A common stock into class A
      common stock and will have the same restrictions on transfer and ownership
      applicable to the transfer and ownership of the class B common stock; and

    - with respect only to dividends or other distributions of voting securities
      of any corporation which is our wholly owned subsidiary, the respective
      voting rights of each such security issued to holders of the class A
      common stock and class B common stock with respect to election of
      directors shall otherwise be as comparable as is practicable to those of
      the class A common stock and class B common stock.

    In the case of dividends or other distributions consisting of securities
convertible into, or exchangeable for, our voting securities or of voting
securities of any corporation which is our wholly owned subsidiary, we will
provide that such convertible or exchangeable securities and the underlying
securities be identical in all respects (including, without limitation, the
conversion or exchange rate) except that the underlying securities may have the
same difference as they would have if we issued voting securities of our wholly
owned subsidiary rather than issuing securities convertible into or exchangeable
for, such securities. We do not anticipate paying cash dividends in the
foreseeable future.

    RESTRICTIONS ON ADDITIONAL ISSUANCES AND TRANSFER.  We may not issue or sell
any shares of class B common stock or any securities (including, without
limitation, any rights, options, warrants or other securities) convertible into,
or exchangeable or exercisable for, shares of class B common stock to any person
or entity other than to Metromedia Company, John W. Kluge and Stuart Subotnick,
their affiliates, relatives and other permitted holders that are controlled by
these persons. Additionally, shares of class B common stock may not be
transferred, whether by sale, assignment, gift, bequest, appointment or
otherwise, to a person other than to a permitted holder. Notwithstanding the
foregoing:

    - any permitted holder may pledge his, her or its shares of class B common
      stock to a financial institution pursuant to a bona fide pledge of such
      shares as collateral security for indebtedness due to the pledgee as long
      as such shares remain subject to the transfer restrictions and that, in
      the event of foreclosure or other similar action by the pledgee, such
      pledged shares of class B common stock may only be transferred to a
      permitted holder or converted into shares of class A common stock, as the
      pledgee may elect; and

    - the foregoing transfer restrictions do not apply in the case of a merger,
      consolidation or business combination of us with or into another
      corporation in which all of the outstanding shares of common stock and
      preferred stock regardless of class are purchased by the acquiror.

    CONVERSION.  Class A common stock has no conversion rights. Shares of
class B common stock are convertible into class A common stock, in whole or in
part, at any time and from time to time at the option of the holders, on the
basis of one share of class A common stock for each share of class B common
stock converted. Additionally, at such time as a person ceased to be a permitted
holder, any share of class B common stock held by such person at such time shall
convert into a share of class A common stock. We agree that:

    - we will at all times reserve and keep available out of our authorized but
      unissued shares of class A common stock, such number of shares of class A
      common stock issuable upon the conversion of all outstanding shares of
      class B common stock;

    - we will cause any shares of class A common stock issuable upon conversion
      of a share of class B common stock that require registration with or
      approval of any governmental authority under federal or state law before
      such shares may be issued upon conversion to be so registered or approved;
      and

                                       23
<PAGE>
    - we will use our best efforts to list the shares of class A common stock
      required to be delivered upon conversion prior to such delivery upon such
      national securities exchange upon which the outstanding class A common
      stock is listed at the time of such delivery.

    RECLASSIFICATION AND MERGER.  In the event of a reclassification or other
similar transaction as a result of which the shares of class A common stock are
converted into another security, then a holder of class B common stock will be
entitled to receive upon conversion the amount of such other securities that the
holder would have received if the conversion occurred immediately prior to the
record date of such reclassification or other similar transaction. No
adjustments in respect of dividends will be made upon the conversion of any
share of class B common stock. If a share is converted subsequent to the record
date for the payment of a dividend or other distribution on shares of class B
common stock but prior to such payment, then the registered holder of such share
at the close of business on such record date will be entitled to receive the
dividend or other distribution payable on such date regardless of the conversion
thereof or our default in payment of the dividend due on such date.

    In the event we enter into any consolidation, merger, combination or other
transaction in which shares of common stock are exchanged for or changed into
other stock or securities, cash and/or any other property, then, and in such
event, the shares of each class of common stock will be exchanged for or changed
into either:

    - the same amount of stock, securities, cash and/or any other property, as
      the case may be, into which or for which each share of any other class of
      common stock is exchanged for or changed into shares of capital stock,
      such shares so exchanged for or changed into may differ only to the extent
      that the class A common stock and the class B common stock differ as
      provided in our amended and restated certificate of incorporation; or

    - if holders of each class of common stock are to receive different
      distributions of stock, securities, cash and/or any other property, an
      amount of stock, securities, cash and/or property per share having a value
      as determined by an independent investment banking firm of national
      reputation selected by the board of directors, equal to the value per
      share into which or for which each share of any other class of common
      stock is exchanged or changed.

    LIQUIDATION.  In the event of our liquidation, after payment of our debts
and other liabilities and after making provision for the holders of preferred
stock, if any, our remaining assets will be distributable ratably among the
holders of the class A common stock and class B common stock treated as a single
class.

    OTHER PROVISIONS.  Except as described below, the holders of the class A
common stock and class B common stock are not entitled to preemptive rights.
None of the class A common stock or class B common stock may be subdivided or
combined in any manner unless the other classes are subdivided or combined in
the same proportion. We may not make any offering of options, rights or warrants
to subscribe for shares of class B common stock. If we make an offering of
options, rights or warrants to subscribe for shares of any other class or
classes of capital stock (other than class B common stock) to all holders of a
class of common stock, then we are required to simultaneously make an identical
offering to all holders of the other classes of common stock other than to any
class the holders of which, voting as a separate class, agrees that such
offerings need not be made to such class. All such options, rights or warrants
offerings will offer the respective holders of class A common stock and class B
common stock the right to subscribe at the same rate per share. All outstanding
shares of common stock are, and all shares of common stock offered hereby when
issued will be upon payment therefor, validly issued, fully paid and
nonassessable.

                                       24
<PAGE>
PREFERRED STOCK

    The board has the authority, without any further action by our stockholders
to issue from time to time shares of preferred stock in one or more series and
to fix the designations, preferences, rights, qualifications, limitations and
restrictions thereof, including voting rights, dividend rights, dividend rates,
conversion rights, terms of redemption, redemption prices, liquidation
preferences and the number of shares constituting any series. The issuance of
preferred stock with voting rights could have an adverse effect on the voting
power of holders of common stock by increasing the number of outstanding shares
having voting rights. In addition, if the board authorizes preferred stock with
conversion rights, the number of shares of common stock outstanding could
potentially be increased up to the authorized amount. The issuance of preferred
stock could decrease the amount of earnings and assets available for
distribution to holders of common stock. Any such issuance could also have the
effect of delaying, deterring or preventing a change in control of the company
and may adversely affect the rights of holders of common stock.

CERTIFICATE OF INCORPORATION AND BY-LAWS

    Stockholders' rights and related matters are governed by the Delaware
General Corporation Law, and our certificate of incorporation and the by-laws.
Certain provisions of our certificate of incorporation and by-laws, which are
summarized below, may have the effect, either alone or in combination with each
other, of discouraging or making more difficult a tender offer or takeover
attempt that is opposed by our board of directors but that a stockholder might
consider to be in its best interest. Such provisions may also adversely affect
prevailing market prices for the common stock. We believe that such provisions
are necessary to enable us to develop our business in a manner that will foster
our long-term growth without disruption caused by the threat of a takeover not
deemed by our board of directors to be in our best interests and those of our
stockholders.

  ADVANCE NOTICE REQUIREMENTS FOR STOCKHOLDER PROPOSALS AND DIRECTOR NOMINATIONS

    Our by-laws establish advance notice procedures for stockholder proposals
and the nomination, other than by or at the direction of the board of directors,
of candidates for election as directors. These procedures provide that the
notice of stockholder proposals and stockholder nominations for the election of
directors at an annual meeting must be in writing and received by our secretary
at least 60 days but not more than 90 days prior to the scheduled date of the
annual meeting. However, if public disclosure of our annual meeting date is made
less than 70 days before the annual meeting, notice by a stockholder will be
considered timely if it is delivered not later than the 10th day following the
earlier of (i) the day on which public disclosure of the date of the annual
meeting was made or (ii) the day on which such notice of the date of the meeting
was mailed. The notice of nominations for the election of directors must set
forth certain information concerning the stockholder giving the notice and each
nominee.

    By requiring advance notice of nominations by stockholders, these procedures
will afford our board of directors an opportunity to consider the qualifications
of the proposed nominees and, to the extent deemed necessary or desirable by the
board of directors, to inform stockholders about these qualifications. By
requiring advance notice of other proposed business, these procedures will
provide our board of directors with an opportunity to inform stockholders of any
business proposed to be conducted at a meeting, together with any
recommendations as to the board of directors' position on action to be taken on
such business. This should allow stockholders to better decide whether to attend
a meeting or to grant a proxy for the disposition of any such business.

  DILUTION

    Our certificate of incorporation provides that our board of directors is
authorized to create and issue, whether or not in connection with the issuance
and sale of any of its stock or other securities or property, rights entitling
the holders to purchase from us shares of stock or other securities of us or of
any other

                                       25
<PAGE>
corporation. Our board of directors is authorized to issue these rights even
though the creation and issuance of these rights could have the effect of
discouraging third parties from seeking, or impairing their right to seek, to:

    (1) acquire a significant portion of our outstanding securities;

    (2) engage in any transaction which might result in a change of control of
       the corporation; or

    (3) enter into any agreement, arrangement or understanding with another
       party to accomplish these transactions or for the purpose of acquiring,
       holding, voting or disposing of any of our securities.

SECTION 203 OF THE DELAWARE GENERAL CORPORATION LAW

    Section 203 of the Delaware General Corporation Law prohibits certain
transactions between a Delaware corporation and an "interested stockholder",
which is defined as a person who, together with any affiliates and/or associates
of such person, beneficially owns, directly or indirectly, 15% or more of the
outstanding voting shares of a Delaware corporation. This provision prohibits
certain business combinations between an interested stockholder and a
corporation for a period of three years after the date the interested
stockholder acquired its stock, unless:

    - the business combination is approved by the corporation's board of
      directors prior to the date the interested stockholder acquired shares;

    - the interested stockholder acquired at least 85% of the voting stock of
      the corporation in the transaction in which it became an interested
      stockholder; or

    - the business combination is approved by a majority of the board of
      directors and by the affirmative vote of two-thirds of the outstanding
      voting stock owned by disinterested stockholders at an annual or special
      meeting.

    A business combination is defined broadly to include mergers,
consolidations, sales or other dispositions of assets having an aggregate value
of 10% or more of the consolidated assets of the corporation, and certain
transactions that would increase the interested stockholder's proportionate
share ownership in the corporation. A Delaware corporation, under a provision in
its certificate of incorporation or by-laws, may elect not to be governed by
Section 203 of the Delaware General Corporation Law. We are subject to the
restrictions imposed by Section 203.

    Under certain circumstances, Section 203 makes it more difficult for a
person who could be an "interested stockholder" to effect various business
combinations with a corporation for a three-year period, although the
stockholders may elect to exclude a corporation from the restrictions imposed
thereunder. Our certificate of incorporation does not exclude us from the
restrictions imposed under Section 203 of the Delaware General Corporation Law.
It is anticipated that the provisions of Section 203 of the Delaware General
Corporation Law may encourage companies interested in acquiring us to negotiate
in advance with the board of directors, since the stockholder approval
requirement would be avoided if a majority of the directors then in office
approves, prior to the date on which a stockholder becomes an interested
stockholder, either the business combination or the transaction which results in
the stockholder becoming an interested stockholder. Mr. Stephen Garafalo and
Metromedia Company are interested stockholders under the Delaware General
Corporation Law. However since their acquisition of our securities was approved
in advance by our board, they would not be prohibited from engaging in a
business transaction with us.

                                       26
<PAGE>
LIMITATIONS OF DIRECTORS' LIABILITY

    Our certificate of incorporation provides that none of our directors will be
personally liable to us or our stockholders for monetary damages for breach of
fiduciary duty as a director except for liability:

    - for any breach of the director's duty of loyalty to us or our
      stockholders,

    - for acts of omissions not in good faith or which involve intentional
      misconduct or a knowing violation of law,

    - under Section 174 of the Delaware General Corporation Law, or

    - for any transaction from which the director derived an improper personal
      benefit.

    The effect of these provisions will be to eliminate our rights and our
stockholders (through stockholders' derivatives suits on behalf of us) to
recover monetary damages against a director for breach of fiduciary duty as a
director (including breaches resulting from grossly negligent behavior), except
in the situations described above. These provisions will not limit the liability
of directors under federal securities laws and will not affect the availability
of equitable remedies such as an injunction or rescission based upon a
director's breach of his duty of care.

TRANSFER AGENT

    The Transfer Agent and Registrar for our class A common stock is ChaseMellon
Shareholder Services, L.L.C.

                                       27
<PAGE>
                            DESCRIPTION OF WARRANTS

    We may issue warrants for the purchase of debt securities, preferred stock
or common stock. Warrants may be issued independently or together with debt
securities, preferred stock or common stock offered by any prospectus supplement
and may be attached to or separate from any such offered securities. Each series
of warrants will be issued under a separate warrant agreement to be entered into
between us and a bank or trust company, as warrant agent. The warrant agent will
act solely as our agent in connection with the warrants and will not assume any
obligation or relationship of agency or trust for or with any holders or
beneficial owners of warrants. The following summary of certain provisions of
the warrants does not purport to be complete and is subject to, and qualified in
its entirety by reference to, the provisions of the warrant agreement that will
be filed with the SEC in connection with the offering of such warrants.

DEBT WARRANTS

    The prospectus supplement relating to a particular issue of debt warrants
will describe the terms of the debt warrants, including the following: (a) the
title of the debt warrants; (b) the offering price for the debt warrants, if
any; (c) the aggregate number of the debt warrants; (d) the designation and
terms of the debt securities purchasable upon exercise of the debt warrants;
(e) if applicable, the designation and terms of the debt securities with which
the debt warrants are issued and the number of such debt warrants issued with
each debt security; (f) if applicable, the date from and after which the debt
warrants and any debt securities issued therewith will be separately
transferable; (g) the principal amount of debt securities purchasable upon
exercise of a debt warrant and the price at which the principal amount of debt
securities may be purchased upon exercise (which price may be payable in cash,
securities, or other property); (h) the date on which the right to exercise the
debt warrants shall commence and the date on which the right shall expire;
(i) if applicable, the minimum or maximum amount of the debt warrants that may
be exercised at any one time; (j) whether the debt warrants represented by the
debt warrant certificates or debt securities that may be issued upon exercise of
the debt warrants will be issued in registered or bearer form; (k) information
with respect to book-entry procedures, if any; (1) the currency or currency
units in which the offering price, if any, and the exercise price are payable;
(m) if applicable, a discussion of material United States federal income tax
considerations; (n) the antidilution provisions of the debt warrants, if any;
(o) the redemption or call provisions, if any, applicable to such debt warrants;
and (p) any additional terms of the debt warrants, including terms, procedures,
and limitations relating to the exchange and exercise of the debt warrants.

STOCK WARRANTS

    The prospectus supplement relating to any particular issue of preferred
stock warrants or common stock warrants will describe the terms of the warrants,
including the following: (a) the title of the warrants; (b) the offering price
for the warrants, if any; (c) the aggregate number of the warrants; (d) the
designation and terms of the common stock or preferred stock purchasable upon
exercise of the warrants; (e) if applicable, the designation and terms of the
offered securities with which the warrants are issued and the number of the
warrants issued with each such offered security; (f) if applicable, the date
from and after which the warrants and any offered securities issued therewith
will be separately transferable; (g) the number of shares of common stock or
preferred stock purchasable upon exercise of a warrant and the price at which
the shares may be purchased upon exercise; (h) the date on which the right to
exercise the warrants shall commence and the date on which the right shall
expire; (i) if applicable, the minimum or maximum amount of the warrants that
may be exercised at any one time; (j) the currency or currency units in which
the offering price, if any, and the exercise price are payable, (k) if
applicable, a discussion of material United States federal income tax
considerations; (l) the antidilution provisions of the warrants, if any;
(m) the redemption or call provisions, if any, applicable to such warrants; and
(n) any additional terms of the warrants, including terms, procedures and
limitations relating to the exchange and exercise of the warrants.

                                       28
<PAGE>
                              SELLING STOCKHOLDERS

    The selling stockholders may be our directors, executive officers, former
directors, employees or certain holders of our common stock, including
Metromedia Company and its general partners. The prospectus supplement for any
offering of the common stock by selling stockholders will include the following
information:

    - the names of the selling stockholders;

    - the nature of any position, office, or other material relationship which
      the selling stockholder has had within the last three years with us or any
      of our predecessors or affiliates;

    - the number of shares held by each of the selling stockholders before the
      offering;

    - the percentage of the common stock held by each of the selling
      stockholders after the offering; and

    - the number of shares of the common stock offered by each of the selling
      stockholders.

                              PLAN OF DISTRIBUTION

    The distribution of the securities may be effected from time to time in one
or more transactions at a fixed price or prices (which may be changed from time
to time), at market prices prevailing at the time of sale, at prices related to
such prevailing market prices or at negotiated prices. Each prospectus
supplement will describe the method of distribution of the securities offered
therein.

    We are also registering shares of our class A common stock on behalf of the
selling stockholders. We and any selling stockholders may sell securities
directly, through agents designated from time to time, through underwriting
syndicates led by one or more managing underwriters or through one or more
underwriters acting alone. The selling stockholders may also distribute
securities through one or more special purpose entities, which may enter into
forward purchase arrangements with selling stockholders and distribute their own
securities. In connection with an offering of securities of such a special
purpose entity, the selling stockholders may also enter into securities loan
agreements with the underwriters of the entity's securities in order to
facilitate such underwriters' market-making activities in the entity's
securities. Each prospectus supplement will describe the terms of the securities
to which the prospectus supplement relates, the names of the selling
stockholders and the number of shares of class A common stock to be sold by
each, the name or names of any underwriters or agents with whom we or the
selling stockholders, or both, have entered into arrangements with respect to
the sale of the securities, the public offering or purchase price of the
securities and the net proceeds we or the selling stockholders will receive from
the sale. In addition, each prospectus supplement will describe any underwriting
discounts and other items constituting underwriters' compensation, any discounts
and commissions allowed or paid to dealers, if any, any commissions allowed or
paid to agents, and the securities exchange or exchanges, if any, on which the
securities will be listed. Dealer trading may take place in certain of the
securities, including securities not listed on any securities exchange.

    If so indicated in the applicable prospectus supplement, we or the selling
stockholders, or both, will authorize underwriters or agents to solicit offers
by certain institutions to purchase securities from us or the selling
stockholders, or both, pursuant to delayed delivery contracts providing for
payment and delivery at a future date. Institutions with which the contracts may
be made include, among others:

    - commercial and savings banks;

    - insurance companies;

    - pension funds;

    - investment companies; and

    - educational and charitable institutions.

                                       29
<PAGE>
    In all cases, the institutions must be approved by us or the selling
stockholders, or both. Unless otherwise set forth in the applicable prospectus
supplement, the obligations of any purchaser under any contract will not be
subject to any conditions except that (i) the purchase of the securities will
not at the time of delivery be prohibited under the laws of the jurisdiction to
which the purchaser is subject and (ii) if the securities are also being sold to
underwriters acting as principals for their own account, the underwriters will
have purchased the securities not sold for delayed delivery. The underwriters
and such other persons will not have any responsibility in respect of the
validity or performance of such contracts.

    Any selling stockholder, underwriter or agent participating in the
distribution of the securities may be deemed to be an underwriter, as that term
is defined in the Securities Act, of the securities so offered and sold and any
discounts or commissions received by them, and any profit realized by them on
the same or resale of the securities may be deemed to be underwriting discounts
and commissions under the Securities Act.

    Certain of any such underwriters and agents including their associates, may
be customers of, engage in transactions with and perform services for us and our
subsidiaries in the ordinary course of business. One or more of our affiliates
may from time to time act as an agent or underwriter in connection with the sale
of the securities to the extent permitted by applicable law. The participation
of any such affiliate in the offer and sale of the securities will comply with
Rule 2720 of the Conduct Rules of the National Association of Securities
Dealers, Inc. regarding the offer and sale of securities of an affiliate.

    Under agreements which may be entered into by us, the underwriters, dealers
and agents who participate in the distribution of securities may be entitled to
indemnification by us against or contribution toward some liabilities, including
liabilities under the Securities Act.

    Except as indicated in the applicable prospectus supplement, the securities
are not expected to be listed on a securities exchange, except for the class A
common stock, which is listed on The Nasdaq Stock Market's National Market, and
any underwriters or dealers will not be obligated to make a market in
securities. We cannot predict the activity or liquidity of any trading in the
securities.

    We will not receive any proceeds from the sale of shares of class A common
stock or any other securities by the selling stockholders. We will, however,
bear certain expenses in connection with the registration of the securities
being offered under this prospectus by the selling stockholders, including all
costs incident to the offering and sale of the securities to the public other
than any commissions and discounts of underwriters, dealers or agents and any
transfer taxes.

                             VALIDITY OF SECURITIES

    The validity of the securities offered hereby will be passed upon for us by
Paul, Weiss, Rifkind, Wharton & Garrison, New York, New York, and certain
matters may be passed upon for the underwriters or agents, if any, by Skadden,
Arps, Slate, Meagher & Flom LLP, Los Angeles, California. Skadden, Arps, Slate,
Meagher & Flom LLP has represented us on other unrelated matters.

                                    EXPERTS

    The consolidated financial statements of Metromedia Fiber Network, Inc.
appearing in Metromedia Fiber Network, Inc.'s Annual Report on Form 10-K for the
year ended December 31, 1998, have been audited by Ernst & Young LLP,
independent auditors, as set forth in their report thereon included therein and
incorporated herein by reference. Such consolidated financial statements are
incorporated herein by reference in reliance upon such report given on the
authority of such firm as experts in accounting and auditing.

    AboveNet's financial statements as of June 30, 1998 and 1999 and for each of
the three years in the period ended June 30, 1999 included and incorporated by
reference in this prospectus have been audited by Deloitte & Touche LLP,
independent auditors, as stated in their report, which is included and

                                       30
<PAGE>
incorporated by reference herein, and have been so included and incorporated in
reliance upon the report of such firm given upon their authority as experts in
accounting and auditing.

    The Combined Statement of Assets to be Acquired and Liabilities to be
Assumed of Palo Alto Internet Exchange as of December 26, 1998 and December 27,
1997 and the related Combined Statement of Revenues and Direct Expenses for the
period June 12, 1998 through December 26, 1998, the period December 28, 1997
through June 12, 1998 and the fiscal years ended December 27, 1997 and
December 29, 1996, that are incorporated by reference in this prospectus by
reference to the Registration Statement on Form S-4 (Registration
No. 333-84541) of Metromedia Fiber Network, Inc. filed with the Securities and
Exchange Commission on August 4, 1999, have been so incorporated in reliance on
the reports of PricewaterhouseCoopers LLP, independent accountants, given on the
authority of said firm as experts in auditing and accounting.

                      WHERE YOU CAN FIND MORE INFORMATION

    We file annual, quarterly and special reports, proxy statements and other
information with the SEC. Our SEC filings are available to the public over the
Internet at the SEC's web site at http://www.sec.gov. You may also read and copy
any document we file with the SEC at the SEC's following public reference
facilities:

<TABLE>
<S>                            <C>                            <C>
    Public Reference Room        New York Regional Office        Chicago Regional Office
   450 Fifth Street, N.W.          7 World Trade Center              Citicorp Center
          Room 1024                     Suite 1300               500 West Madison Street
   Washington, D.C. 20549        New York, New York 10048              Suite 1400
                                                              Chicago, Illinois 60661-2511
</TABLE>

    You may also obtain copies of the documents at prescribed rates by writing
to the Public Reference Section of the SEC at 450 Fifth Street, N.W., Room 1024,
Washington, D.C. 20549. Please call 1-800-SEC-0330 for further information on
the operations of the public reference facilities. Our SEC filings are also
available at the offices of The Nasdaq Stock Market at 1735 K Street, N.W.,
Washington, D.C. 20006.

               INCORPORATION OF INFORMATION WE FILE WITH THE SEC

    The SEC allows us to "incorporate by reference" the information we file with
them, which means: incorporated documents are considered part of this
prospectus; we can disclose important information to you by referring you to
those documents; and information that we file with the SEC will automatically
update and supersede this incorporated information.

    We incorporate by reference the documents listed below which were filed with
the SEC under the Securities Exchange Act of 1934:

    - Our Annual Report on Form 10-K for the year ended on December 31, 1998;

    - Our Quarterly Report on Form 10-Q for the three months ended March 31,
      1999;

    - Our Quarterly Report on Form 10-Q for the six months ended June 30, 1999;

    - Our Current Report on Form 8-K dated June 30, 1999;

    - Our Current Report on Form 8-K dated September 10, 1999, as amended by our
      Current Report on Form 8-K/A dated October 14, 1999 and as further amended
      by our Current Report on Form 8-K/A dated October 26, 1999;

    - Our Current Report on Form 8-K dated October 18, 1999;

                                       31
<PAGE>
    - The "Risk Factors--Risk Factors Applicable to AboveNet" and "Business of
      AboveNet" sections and the financial statements of Palo Alto Internet
      Exchange contained in our Registration Statement on Form S-4 dated
      August 5, 1999 (File No. 333-84541); and

    - The description of our class A common stock contained in our Registration
      Statement on Form 8-A, filed on October 17, 1997.

    We also incorporate by reference each of the following documents that we
will file with the SEC after the date of the initial filing of the registration
statement and prior to the time we sell all of the securities offered by this
prospectus:

    - Reports filed under Section 13(a) and (c) of the Exchange Act;

    - Definitive proxy or information statements filed under Section 14 of the
      Exchange Act in connection with any subsequent shareholders meeting; and

    - Any reports filed under Section 15(d) of the Exchange Act.

    You can obtain any of the filings incorporated by reference in this document
through us, or from the SEC through the SEC's web site or at the addresses
listed above. Documents incorporated by reference are available from us without
charge, excluding any exhibits to those documents unless the exhibit is
specifically incorporated by reference as an exhibit in this prospectus. You can
obtain documents incorporated by reference in this prospectus by requesting them
in writing or by telephone from us at the following address:

                         Metromedia Fiber Network, Inc.
                           One North Lexington Avenue
                          White Plains, New York 10601
                         Attention: Investor Relations
                           Telephone: (914) 421-6700

    If you request any incorporated documents from us, we will mail them to you
by first class mail, or another equally prompt means, within one business day
after we receive your request.

                                       32
<PAGE>
                         OUR PRINCIPAL EXECUTIVE OFFICE
                         Metromedia Fiber Network, Inc.
                           One North Lexington Avenue
                      White Plains, New York 10601, U.S.A.

                                    AUDITORS
                               Ernst & Young LLP
                               787 Seventh Avenue
                        New York, New York 10019, U.S.A.

                                 LEGAL ADVISORS

<TABLE>
<S>                                            <C>
              FOR OUR COMPANY:                             FOR THE UNDERWRITERS:
  Paul, Weiss, Rifkind, Wharton & Garrison       Skadden, Arps, Slate, Meagher & Flom LLP
         1285 Avenue of the Americas                      300 South Grand Avenue
      New York, New York 10019, U.S.A.             Los Angeles, California 90071, U.S.A.
</TABLE>

                                    TRUSTEE
                              The Bank of New York
                               101 Barclay Street
                                 Floor 21 West
                        New York, New York 10286, U.S.A.

<TABLE>
<S>                                            <C>
   PRINCIPAL PAYING AGENT FOR DOLLAR NOTES         PRINCIPAL PAYING AGENT FOR EURO NOTES
            The Bank of New York                           The Bank of New York
             101 Barclay Street                                London Branch
                Floor 21 West                                 1 Canada Square
      New York, New York 10286, U.S.A.                London, E14 5AL, United Kingdom
</TABLE>

                      LUXEMBOURG PAYING AND TRANSFER AGENT
                        Kredietbank S.A. Luxembourgeoise
                               43 boulevard Royal
                               L-2955 Luxembourg

                                 LISTING AGENT
                        Kredietbank S.A. Luxembourgeoise
                               43 boulevard Royal
                               L-2955 Luxembourg
<PAGE>
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                                 $1,010,900,000

                         METROMEDIA FIBER NETWORK, INC.

                     $750,000,000 10% SENIOR NOTES DUE 2009

                  [EURO]250,000,000 10% SENIOR NOTES DUE 2009

                                     [LOGO]

                                     ------

                             PROSPECTUS SUPPLEMENT
                               NOVEMBER 12, 1999
                                   ---------

                              SALOMON SMITH BARNEY
                             CHASE SECURITIES INC.
                           DEUTSCHE BANC ALEX. BROWN
                          DONALDSON, LUFKIN & JENRETTE
                              GOLDMAN, SACHS & CO.
                           MORGAN STANLEY DEAN WITTER

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