<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM QUARTERLY
REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT
OF 1934 FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 1999.
</LEGEND>
<RESTATED>
<CIK> 0001061566
<NAME> EARTHLINK NETWORK
<MULTIPLIER> 1,000
<CURRENCY> US $

<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS                   9-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1999             DEC-31-1998             DEC-31-1999
<PERIOD-START>                             JUL-01-1998             JUL-01-1999             JAN-01-1998             JAN-01-1999
<PERIOD-END>                               SEP-30-1998             SEP-30-1999             SEP-30-1998             SEP-30-1999
<EXCHANGE-RATE>                                      1                       1                       1                       1
<CASH>                                               0                 338,315                       0                       0
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                        0                  11,034                       0                       0
<ALLOWANCES>                                         0                   (649)                       0                       0
<INVENTORY>                                          0                   1,581                       0                       0
<CURRENT-ASSETS>                                     0                 361,445                       0                       0
<PP&E>                                               0                  86,361                       0                       0
<DEPRECIATION>                                       0                (34,222)                       0                       0
<TOTAL-ASSETS>                                       0                 443,512                       0                       0
<CURRENT-LIABILITIES>                                0                  78,426                       0                       0
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                      47                       0                       0
<COMMON>                                             0                     326                       0                       0
<OTHER-SE>                                           0                       0                       0                       0
<TOTAL-LIABILITY-AND-EQUITY>                         0                 443,512                       0                       0
<SALES>                                              0                       0                       0                       0
<TOTAL-REVENUES>                                49,824                  89,574                 117,640                 235,818
<CGS>                                                0                       0                       0                       0
<TOTAL-COSTS>                                   20,871                  33,608                  52,669                  96,280
<OTHER-EXPENSES>                                49,347                  91,457                 103,127                 229,334
<LOSS-PROVISION>                                   991                   1,195                   2,678                   2,975
<INTEREST-EXPENSE>                                 353                     308                   1,661                   1,040
<INCOME-PRETAX>                               (18,828)                (31,365)                (37,249)                (78,155)
<INCOME-TAX>                                         0                       0                       0                       0
<INCOME-CONTINUING>                           (20,394)                (35,491)                (38,156)                (89,796)
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                  (18,828)                (31,365)                (37,249)                (78,155)
<EPS-BASIC>                                     (0.78)                  (1.07)                  (1.64)                  (2.78)
<EPS-DILUTED>                                   (0.78)                  (1.07)                  (1.64)                  (2.78)


</TABLE>