EX-32.2 6 rax322.htm SECTION 906 CERTIFICATION OF CFO rax322.htm
                                                                                                                      Exhibit 32.2
 
CERTIFICATION OF CHIEF FINANCIAL OFFICER
PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
 
In connection with the Annual Report on Form 10-K of Rackspace Hosting, Inc. for the year ended December 31, 2010 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Bruce R. Knooihuizen , as Principal Financial Officer of Rackspace Hosting, Inc., hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Rackspace Hosting, Inc.
 
             
Date: February 18, 2011
      
By:
  
/s/ Bruce R. Knooihuizen
           
 Bruce R. Knooihuizen
           
 Chief Financial Officer, Senior Vice President and  Treasurer
 (Principal Financial Officer)