[] [Our Ref RDS\653749\6002674v1 Direct tel +852 2971 3046 Email richard.spoooner@maplesandcalder.com 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road, Chaoyang District, Beijing 100016 People’s Republic of China 3 April 2013 Dear Sirs 21Vianet Group, Inc. Company Registration Statement” Shares Plan We have examined the Registration Statement on Form S-8 to be filed by 21Vianet Group, Inc., a Cayman Islands exempted company] [21Vianet Group, Inc. (formerly known as AsiaCloud Inc.) (Adopted on July 16, 2010 and amended on January 14, 2011; share information has reflected the 10-for-1 share split effective on March 31, 2011; further amended by the board of directors as of July 6, 2012) ARTICLE 1 PURPOSE Plan Company ARTICLE 2 DEFINITIONS AND CONSTRUCTION Wherever the following terms are used] [Consent of Independent Registered Public Accounting Firm Ernst & Young Hua Ming LLP Shanghai, People’s Republic of China April 3, 2013 EX-23.1 4 d515390dex231.htm EX-23.1]