Press Release Details

BEIJING, Feb. 1, 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 that it plans to release its fourth quarter and full year 2011 financial results on Monday, February 27, 2012 after market close.

The Company will hold a conference call on Tuesday, February 28, 2012 at 8:00 am Eastern Time to discuss the financial results. Listeners may access the call by dialing the following numbers:

The replay will be accessible through March 6, 2012 by dialing the following numbers:

A webcast of the conference call will be available through the Company's investor relation website at http://ir.21vianet.com

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 1,400 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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