VNET [21Vianet] CORRESP: 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road
[21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road Chaoyang District Beijing, 100016 The Peoples Republic of China November 12, 2013 VIA EDGAR Stephen Krikorian, Accounting Branch Chief Melissa Walsh, Staff Accountant 100 F Street, N.E. Re: 21Vianet Group, Inc. (the Company) Form 20-F for the Fiscal Year Ended December 31, 2012 (the 2012 Form 20-F) Filed on April 19, 2013]