[INTRODUCTION 1 1 PART I 3 ITEM 1. IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS 3 ITEM 2. OFFER STATISTICS AND EXPECTED TIMETABLE 3 ITEM 3. KEY INFORMATION 3 ITEM 4. INFORMATION ON THE COMPANY 45 ITEM 4A. UNRESOLVED STAFF COMMENTS 67 ITEM 5. OPERATING AND FINANCIAL REVIEW AND PROSPECTS 67 ITEM 6. DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES 96 ITEM] [List of Significant Subsidiaries and Principal Consolidated Affiliated Entities* Significant Subsidiaries Jurisdiction of Incorporation 21ViaNet Group Limited Hong Kong 21Vianet Mobile Limited Hong Kong Hongkong Fastweb Holdings Co., Limited Hong Kong Diyixian.com Limited Hong Kong DYXNet Limited Hong Kong Dermot Holdings Limited British Virgin Islands WiFire Group Inc. British Virgin Islands Fastweb International Holdings Cayman Islands 21Vianet Data Center Co.,] [I, Steve Zhang, 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, Terry Wang, 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. Steve Zhang Chief Executive Officer EX-13.1 5 d124901dex131.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. Terry Wang Chief Financial Officer EX-13.2 6 d124901dex132.htm EX-13.2] [CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in the Registration Statements: i) Form S-8 No. 333-177273, pertaining to the 2010 Share Incentive Plan; iii) Form S-8 No.333-197495, pertaining to the 2014 Share Incentive Plan; and (Form 20-F) of 21Vianet Group, Inc. of our reports dated April 12, 2016, with respect to the consolidated] [Consent of Beijing DHH Law Firm To: 21Vianet Group, Inc. M5, 1 Jiuxianqiao East Road Chaoyang District, Beijing 100016 the People’s Republic of China Date Dear Sirs, Yours faithfully, Beijing DHH Law Firm EX-15.2 8 d124901dex152.htm EX-15.2]