<TABLE> <S> <C>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED FINANCIAL STATEMENTS OF NETWORK-1 SECURITY SOLUTIONS, INC. FOR THE
PERIOD ENDED JUNE 30, 2000 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 6,339,000
<SECURITIES> 0
<RECEIVABLES> 384,000
<ALLOWANCES> 60,000
<INVENTORY> 21,000
<CURRENT-ASSETS> 6,832,000
<PP&E> 593,000
<DEPRECIATION> 144,000
<TOTAL-ASSETS> 8,028,000
<CURRENT-LIABILITIES> 866,000
<BONDS> 0
0
2,000
<COMMON> 62,000
<OTHER-SE> 6,271,000
<TOTAL-LIABILITY-AND-EQUITY> 8,028,000
<SALES> 474,000
<TOTAL-REVENUES> 544,000
<CGS> 29,000
<TOTAL-COSTS> 219,000
<OTHER-EXPENSES> 2,743,000
<LOSS-PROVISION> 25,000
<INTEREST-EXPENSE> 1,551,000
<INCOME-PRETAX> (3,845,000)
<INCOME-TAX> 0
<INCOME-CONTINUING> (3,845,000)
<DISCONTINUED> 2,087,000
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (1,758,000)
<EPS-BASIC> (0.31)
<EPS-DILUTED> (0.31)
</TABLE>