<PAGE>
FILED PURSUANT TO RULE 424(B)(3)
REGISTRATION NO. 333-78715
PROSPECTUS SUPPLEMENT DATED OCTOBER 12, 1999
(TO PROSPECTUS DATED JUNE 11, 1999)
156,818 SHARES
IFX CORPORATION
COMMON STOCK
The table on page 12 of this Prospectus under the heading "Selling
Stockholders" is amended to delete all references in the table to Ara Pacis
Servicios y Asesorias Limitada ("Ara Pacis") and Valcorp Inmobiliaria e
Inversiones Limitada ("Valcorp"), and to replace such references with the
information contained in the table below. The changes listed in the table below
reflect the sale by Ara Pacis to Valcorp of certain shares of Common Stock
covered by this Prospectus pursuant to a privately negotiated transaction.
Information about other selling stockholders is found on page 12 of this
Prospectus under the heading "Selling Stockholders" and is not being amended by
this Prospectus Supplement.
<TABLE>
<CAPTION>
Beneficial Ownership Beneficial Ownership
Prior to Offering After Offering
----------------------- --------------------
Shares to Be
Selling Stockholders Shares(1) Percentage Offered Shares Percentage
- ------------------------------------ ---------- ----------- ------------ ------- -----------
<S> <C> <C> <C> <C> <C>
Valcorp Inmobiliaria e Inversiones
Limitada........................... 22,382 * 22,382 0 -
</TABLE>
___________
* Less than 1%.
(1) For purposes of this table, a person is deemed to have "beneficial
ownership" of any shares of Common Stock which such person has the right to
acquire within 60 days after the date of this Prospectus. For purposes of
computing the percentage of outstanding shares of Common Stock held by each
person named above, any security which such person has the right to acquire
from IFX within 60 days after the date of this Prospectus is deemed to be
outstanding, but is not deemed to be outstanding for the purpose of
computing the percentage ownership of any other person.
