Press Release Details

BEIJING, May 15, 2012 (GLOBE NEWSWIRE) -- 21Vianet Group, Inc. (Nasdaq:VNET) ("21Vianet" or the "Company"), the largest carrier-neutral Internet data center services provider in China, today announced the Company's participation in the following conferences:

• Morgan Stanley 3^rd Annual Hong Kong Investor Summit, to be held May 21- 25, 2012 at the International Commerce Centre in Hong Kong. Management is currently scheduled to present and to meet with institutional investors on Monday, May 21, 2012.
   
• Barclays Capital Global Technology, Media and Telecommunications Conference, to be held May 22-23, 2012 at the Sheraton New York Hotel & Towers in New York. Management is currently scheduled to present and to meet with institutional investors on Tuesday, May 22, 2012.
   
• Piper Jaffray 9^th Annual China Growth Conference, to be held June 11-12, 2012 at the JW Marriott in Hong Kong. Management is currently scheduled to present and to meet with institutional investors on June 11, 2012.
   
• CLSA China Internet Corporate Access Day, to be held June 12, 2012 at the Hilton Beijing Wangfujing Hotel in Beijing. Management is scheduled to meet with institutional investors throughout the day.
   
• J.P. Morgan China Conference   2012 to be held June 13-15, 2012 at the Grand Hyatt Hotel in Beijing.  Management is scheduled to present and to meet with institutional investors on Thursday, June 14, 2012.

For additional information, please contact your respective institutional sales representative.

About 21Vianet

21Vianet Group, Inc. is the largest carrier-neutral Internet data center services provider in China. 21Vianet provides hosting and related services, managed network services and cloud computing infrastructure services, improving the reliability, security and speed of its customers' Internet connections through 21Vianet's Internet infrastructure. Customers may locate their servers and networking equipment in 21Vianet's data centers and connect to China's Internet backbone through 21Vianet's extensive fiber optic network. In addition, 21Vianet's proprietary smart routing technology, BroadEx, enables customers' data to be delivered across the Internet in a faster and more reliable manner. 21Vianet operates in 33 cities throughout China, servicing a diversified and loyal base of more than 1,500 customers that span many industries ranging from Internet companies to government entities and blue-chip enterprises to small- to mid-sized enterprises.

CONTACT: Investor Relations Contact:

         ICR, LLCJeremy Peruski

         +1 (646) 405-4922

         IR@21Vianet.com

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