[INTRODUCTION 1 PART I 2 ITEM 1. IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS 2 ITEM 2. OFFER STATISTICS AND EXPECTED TIMETABLE 2 ITEM 3. KEY INFORMATION 2 ITEM 4. INFORMATION ON THE COMPANY 37 ITEM 4A. UNRESOLVED STAFF COMMENTS 55 ITEM 5. OPERATING AND FINANCIAL REVIEW AND PROSPECTS 56 ITEM 6. DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES 82 ITEM 7.] [List of Significant Subsidiaries and Principal Consolidated Affiliated Entities* Significant Subsidiaries Jurisdiction of Incorporation 21ViaNet Group Limited Hong Kong iJoy Holding Limited British Virgin Islands Asiacloud Wireless Limited Hong Kong 21Vianet Data Center Co., Ltd. PRC 21Vianet Anhui Suzhou Technology Co., Ltd. PRC Suzhou Zhuoaiyi Information Technology Co., Ltd. PRC 21Vianet (Foshan) Technology Co., Ltd. PRC Principal Consolidated Affiliated Entities] [I, Sheng Chen, certify that: 1. I have reviewed this annual report on Form 20-F of 21Vianet Group, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made,] [Certification by the Principal Financial Officer I, Shang-Wen Hsiao, certify that: 1. I have reviewed this annual report on Form 20-F of 21Vianet Group, Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances] [(1) (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. Sheng Chen Chief Executive Officer EX-13.1 5 d611305dex131.htm EX-13.1] [Certification by the Principal Financial Officer (1) (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. Shang-Wen Hsiao Chief Financial Officer EX-13.2 6 d611305dex132.htm EX-13.2] [CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Shanghai, People’s Republic of China April 9, 2014 EX-15.1 7 d611305dex151.htm EX-15.1] [Consent of King & Wood Mallesons To: 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road Chaoyang District, Beijing 100016 the People’s Republic of China Dear Sirs, Yours faithfully, King & Wood Mallesons EX-15.2 8 d611305dex152.htm EX-15.2]