|Exhibit 32.1                                                                                                                                                                                                                                                                                                                                                                                                                                                   
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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, Jack L. Waterman, Chief Executive Officer & Chairman 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.