EXHIBIT 99.2

                    CERTIFICATION OF CHIEF FINANCIAL OFFICER
           PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
                            (18 U.S.C. SECTION 1350)

    In connection with the Quarterly Report on Form 10-Q of DoubleClick Inc.
(the 'Company') for the quarterly period ended June 30, 2002, as filed with the
Securities and Exchange Commission on the date hereof (the 'Report'), Bruce
Dalziel, as Chief Financial Officer of the Company, hereby certifies, pursuant
to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that:

        (1) The Report fully complies with the requirements of sections 13(a) or
    15(d) of the Securities Exchange Act of 1934; and

        (2) The information contained in the Report fairly presents, in all
    material respects, the financial condition and results of operations of the
    Company.

                                                   /s/ BRUCE DALZIEL
                                           .....................................
                                                      BRUCE DALZIEL
                                                 CHIEF FINANCIAL OFFICER

August 14, 2002