As Of                Filer                Filing    For·On·As Docs:Size              Issuer               Agent

 3/16/05  Doubleclick Inc                   10-K       12/31/04   10:1.0M                                   RR Donnelley/FA

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Doubleclick Inc.                                    HTML    879K 
 2: EX-10.23    Ex-10.23: Description of Compensation Arrangements  HTML     14K 
                          for Certain Executive Officers                         
 3: EX-10.24    Ex-10.24: Description of Compensation Arrangements  HTML     10K 
                          With Non-Employee Directors                            
 4: EX-10.25    Ex-10.25: Severance Agreement                       HTML     29K 
 5: EX-21.1     Ex-21.1: Subsidiaries                               HTML      9K 
 6: EX-23.1     Ex-23.1: Consent of Pricewaterhousecoopers LLP      HTML     10K 
 7: EX-31.1     Ex-31.1: Certification                              HTML     13K 
 8: EX-31.2     Ex-31.2: Certification                              HTML     14K 
 9: EX-32.1     Ex-32.1: Certification                              HTML      8K 
10: EX-32.2     Ex-32.2: Certification                              HTML      9K 

EXHIBIT 21.1

SUBSIDIARIES OF THE REGISTRANT

AS OF DECEMBER 31, 2004

SUBSIDIARIES OF DOUBLECLICK INC.

DoubleClick Holding Corp. (Delaware)
DoubleClick Real Property LLC (Delaware)
DoubleClick International Internet Advertising Limited (Ireland)
DoubleClick International Asia Holding NV (Netherlands Antilles)
Protagona Limited (United Kingdom)
Performics Inc. (Delaware)
DoubleClick Enterprise Marketing Solutions Inc. (North Carolina)

WHOLLY-OWNED SUBSIDIARIES OF DOUBLECLICK INTERNATIONAL INTERNET ADVERTISING LIMITED (IRELAND)

DoubleClick International TechSolutions Limited (Ireland)
DoubleClick Deutschland GmbH (Germany)
DoubleClick France SAS (France)
DoubleClick Espana SL (Spain)
DoubleClick Europe Limited (United Kingdom)
Abacus Direct Europe B.V. (Netherlands)
DoubleClick Email Canada Inc. (Canada)

WHOLLY-OWNED SUBSIDIARIES OF PROTAGONA LIMITED

DoubleClick Campaign Management Limited (United Kingdom)

WHOLLY-OWNED SUBSIDIARIES OF ABACUS DIRECT EUROPE B.V.

Abacus Direct (UK) Limited (United Kingdom)
Abacus KK (Japan)
Abacus Direct Ireland Limited (Ireland)

WHOLLY-OWNED SUBSIDIARY OF DOUBLECLICK DEUTSCHLAND GMBH (GERMANY)

Abacus Holdings GmbH (Germany)

WHOLLY-OWNED SUBSIDIARY OF DOUBLECLICK HOLDING CORP. (DELAWARE)

Bambino Finance Corp. (Delaware)

WHOLLY-OWNED SUBSIDIARY OF DOUBLECLICK INTERNATIONAL ASIA HOLDING NV (NETHERLAND ANTILLES)

DoubleClick International Asia BV (Netherlands)

WHOLLY-OWNED SUBSIDIARIES OF DOUBLECLICK INTERNATIONAL ASIA BV (NETHERLANDS)

DoubleClick TechSolutions (Beijing) Co. Limited (China)
DoubleClick Asia Limited (Hong Kong)
DoubleClick Australia Pty. Limited (Australia)

Note: Jurisdiction of incorporation noted in parentheses.