BEIJING, Dec. 15, 2011 (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 has exercised its option to acquire the remaining 49%
equity interest in two companies that provide managed network services,
Zhiboxintong (Beijing) Network Technology Co., Ltd. and Beijing
Chengyishidai Network Technology Co., Ltd. (together, the "Managed
Network Entities"). In September 2010, the Company acquired 51% equity
interest in the Management Network Entities with an option to acquire
the remaining 49% equity interest before December 31, 2011.

Mr. Josh Chen, Founder, Chairman and Chief Executive Officer of the
Company, stated, "We remain committed to further expanding our managed
network services to meet our growing customer demand. We are confident
that the completion of this acquisition will enable us to further
integrate the Managed Network Entities' extensive network and business
operations, streamlining expenses and solidifying our industry
leadership."

Mr. Shang Hsiao, President and Chief Financial Officer of the Company,
commented, "Going forward, we continue to believe that the full
acquisition of the Managed Network Entities will further enhance the
revenue growth and profitability of our business in the coming years
due to increasing demand for managed network services. This acquisition
is not expected to have any material impact on our announced guidance
for the fourth quarter of 2011."

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.

Safe Harbor Statement

This announcement contains forward-looking statements. These
forward-looking statements are made under the "safe harbor" provisions
of the U.S. Private Securities Litigation Reform Act of 1995. These
statements can be identified by terminology such as "will," "expects,"
"anticipates," "future," "intends," "plans," "believes," "estimates"
and similar statements. Among other things, the outlook for the fourth
quarter of 2011 and quotations from management in this announcement, as
well as 21Vianet's strategic and operational plans, contain
forward-looking statements. 21Vianet may also make written or oral
forward-looking statements in its reports filed with, or furnished to,
the U.S. Securities and Exchange Commission, in its annual reports to
shareholders, in press releases and other written materials and in oral
statements made by its officers, directors or employees to third
parties. Statements that are not historical facts, including statements
about 21Vianet's beliefs and expectations, are forward-looking
statements. Forward-looking statements involve inherent risks and
uncertainties. A number of factors could cause actual results to differ
materially from those contained in any forward-looking statement,
including but not limited to the following: 21Vianet's goals and
strategies; 21Vianet's expansion plans; the expected growth of the data
center services market; expectations regarding demand for, and market
acceptance of, 21Vianet's services; 21Vianet's expectations regarding
keeping and strengthening its relationships with customers; 21Vianet's
plans to invest in research and development to enhance its solution and
service offerings; and general economic and business conditions in the
regions where 21Vianet provides solutions and services. Further
information regarding these and other risks is included in 21Vianet's
reports filed with, or furnished to the Securities and Exchange
Commission. 21Vianet does not undertake any obligation to update any
forward-looking statement, except as required under applicable law. All
information provided in this press release is as of the date of this
press release, and 21Vianet undertakes no duty to update such
information, except as required under applicable law.


CONTACT: Investor Relations Contact:
         ICR, Inc.
         Jeremy Peruski
         +1 (646) 405-4922
         IR@21Vianet.com