Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND 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, 2008 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), A. Lanham Napier, as Principal Executive 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 27, 2009	By:	/s/ A. Lanham Napier
		A. Lanham Napier
		President, Chief Executive Officer, and Director (Principal Executive Officer)

In connection with the Annual Report on Form 10-K of Rackspace Hosting, Inc. for the year ended December 31, 2008 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 27, 2009	By:	/s/ Bruce R. Knooihuizen
		Bruce R. Knooihuizen
		Senior Vice-President, Chief Financial Officer, and Treasurer (Principal Financial and Accounting Officer)