<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE PILOT
NETWORK SERVICES, INC. FORM 10-Q FOR THE PERIOD ENDED JUNE 30, 2000 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> MAR-31-2001
<PERIOD-START> APR-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 19,617
<SECURITIES> 891
<RECEIVABLES> 9,267
<ALLOWANCES> 500
<INVENTORY> 0
<CURRENT-ASSETS> 31,382
<PP&E> 46,745
<DEPRECIATION> 18,357
<TOTAL-ASSETS> 60,820
<CURRENT-LIABILITIES> 24,440
<BONDS> 6,700
0
11,450
<COMMON> 15
<OTHER-SE> 18,215
<TOTAL-LIABILITY-AND-EQUITY> 60,820
<SALES> 11,537
<TOTAL-REVENUES> 11,537
<CGS> 9,690
<TOTAL-COSTS> 9,690
<OTHER-EXPENSES> 7,153
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> (448)
<INCOME-PRETAX> (5,754)
<INCOME-TAX> 0
<INCOME-CONTINUING> 0
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (5,754)
<EPS-BASIC> (0.382)
<EPS-DILUTED> (0.382)
</TABLE>