VNET [21Vianet] 424B4: (Original Filing)

[Page Prospectus Summary 1 Risk Factors 13 41 Use of Proceeds 43 Dividend Policy 44 Capitalization 45 Dilution 46 Exchange Rate Information 48 Enforceability of Civil Liabilities 49 Our Corporate History and Structure 50 Selected Consolidated Financial and Operating Data 54 Management’s Discussion and Analysis of Financial Condition and Results of Operations 58 Industry 89 Business 93 Page Regulation]

VNET [21Vianet] 424B4: Page Prospectus Summary 1 Risk Factors 13 41

[Page Prospectus Summary 1 Risk Factors 13 41 Use of Proceeds 43 Dividend Policy 44 Capitalization 45 Dilution 46 Exchange Rate Information 48 Enforceability of Civil Liabilities 49 Our Corporate History and Structure 50 Selected Consolidated Financial and Operating Data 54 Management’s Discussion and Analysis of Financial Condition and Results of Operations 58 Industry 89 Business 93 Page Regulation]

VNET [21Vianet] F-1MEF: (Original Filing)

[] [Our ref VZL\653749\4416045v4 Direct tel +852 2971 3095 Email valerie.law@maplesandcalder.com 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road Chaoyang District Beijing 100016 People’s Republic of China 20 April 2011 Dear Sirs 21Vianet Group, Inc. Company Registration Statement Rule 462(b) Registration Statement ADSs Shares We have acted as Cayman Islands legal advisers to 21Vianet Group Inc. (the “ 1 Documents Reviewed] [Consents of Independent Registered Public Accounting Firm Shanghai, the People’s Republic of China April 21, 2011 EX-23.1 3 dex231.htm CONSENTS OF ERNST & YOUNG HUA MING]

VNET [21Vianet] F-1MEF:

[] [Our ref VZL\653749\4416045v4 Direct tel +852 2971 3095 Email valerie.law@maplesandcalder.com 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road Chaoyang District Beijing 100016 People’s Republic of China 20 April 2011 Dear Sirs 21Vianet Group, Inc. Company Registration Statement Rule 462(b) Registration Statement ADSs Shares We have acted as Cayman Islands legal advisers to 21Vianet Group Inc. (the “ 1 Documents Reviewed] [Consents of Independent Registered Public Accounting Firm Shanghai, the People’s Republic of China April 21, 2011 EX-23.1 3 dex231.htm CONSENTS OF ERNST & YOUNG HUA MING]

VNET [21Vianet] EFFECT: (Original Filing)

[.FormData {color: blue; background-color: white; font-size: small; font-family: Times, serif} .SmallFormData {color: blue; background-color: white; font-size: x-small; font-family: Times, serif} .FootnoteData {color: green; background-color: white; font-size: x-small; font-family: Times, serif} .FormText {font-size: x-small; font-family: arial, helvetica, sans-serif} .SmallFormText {font-size: xx-small; font-family: arial, helvetica, sans-serif} .FormTitle {font-size: medium; font-family: arial, helvetica, sans-serif; font-weight: bold} .FormName {font-size: large; font-family: arial, helvetica, sans-serif;]

VNET [21Vianet] EFFECT: .FormData {color: blue; background-color: white; font-size: small; font-family:

[.FormData {color: blue; background-color: white; font-size: small; font-family: Times, serif} .SmallFormData {color: blue; background-color: white; font-size: x-small; font-family: Times, serif} .FootnoteData {color: green; background-color: white; font-size: x-small; font-family: Times, serif} .FormText {font-size: x-small; font-family: arial, helvetica, sans-serif} .SmallFormText {font-size: xx-small; font-family: arial, helvetica, sans-serif} .FormTitle {font-size: medium; font-family: arial, helvetica, sans-serif; font-weight: bold} .FormName {font-size: large; font-family: arial, helvetica, sans-serif;]

VNET [21Vianet] FWP: (Original Filing)

[Issuer Free Writing Prospectus Registration No. 333-173292 April 20, 2011 21VIANET GROUP, INC. http://www.sec.gov/Archives/edgar/data/1508475/000119312511103118/df1a.htm On April 6, 2011, the Company filed Amendment No. 1 to its registration statement on Form F-1, including a preliminary prospectus, or the Preliminary Prospectus. This free writing prospectus reflects the following amendments that were made to the Preliminary Prospectus dated April 6, 2011. References to]

VNET [21Vianet] FWP: Issuer Free Writing Prospectus Registration No. 333-173292 April

[Issuer Free Writing Prospectus Registration No. 333-173292 April 20, 2011 21VIANET GROUP, INC. http://www.sec.gov/Archives/edgar/data/1508475/000119312511103118/df1a.htm On April 6, 2011, the Company filed Amendment No. 1 to its registration statement on Form F-1, including a preliminary prospectus, or the Preliminary Prospectus. This free writing prospectus reflects the following amendments that were made to the Preliminary Prospectus dated April 6, 2011. References to]

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