21Vianet Group, Inc. provides carrier-neutral Internet data center services to Internet companies, government entities, blue-chip enterprises, and small- to mid-sized enterprises in the People’s Republic of China. It offers hosting and related services to house servers and networking equipment in its data centers, and connects them through a data transmission network; and other hosting related value-added services. The company’s hosting and related services include managed hosting services that offer data center space to customers’ servers and networking equipment and provide tailored server administration services; and interconnectivity services that allow customers to connect their servers with Internet backbones and other networks through its border gateway protocol network or single-line, dual-line, or multiple-line network. Its hosting and related services also comprises content delivery network services; cloud services that enable businesses to run their applications over the Internet using its IT infrastructure; virtual private network services; and value-added services, such as firewall, server load balancing, data backup and recovery, data center management, server management, and backup server services. In addition, the company provides traffic charts and analysis, gateway monitoring for servers, domain name system setup, defense mechanism against distributed denial of service attacks, basic setting of switches and routers, and virus protections; managed network services that allow customers to transmit data across the Internet through its hosting area network and data transmission network; route optimization services; and wired broadband services. As of December 31, 2014, it operated 16 self-built and 73 partnered data centers located in approximately 30 cities in China with 21,522 cabinets. It has strategic partnerships with Microsoft Corporation and IBM. The company was founded in 1999 and is headquartered in Beijing, the People’s Republic of China.