|Exhibit 32.2                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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|CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002                                                                                                                                                                                                                                                                                                                                                              
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|In connection with the Annual Report of VitalStream Holdings, Inc. (the "Company") on Form 10-K for the year ended December 31, 2005 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Mark Z. Belzowski, Chief Financial Officer (Principal Financial Officer) of the Company, certify, pursuant to 18 U.S.C. Subsection 1350, as adopted pursuant to Subsection 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:
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|This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.