21Vianet, founded in 1996, is one of the earliest ISP/IDC service suppliers in China. 21Vianet is the largest telecom neutral internet infrastructure and service supplier in China. Its headquarters are located in Beijing, with branch offices in Shanghai, Guangzhou, Chengdu, Tokyo, and Silicon Valley. The main business of 21Vianet includes: Internet Data Center service (IDC), Content Delivery Network (CDN), Enterprise Data Center service (EDC), and Data Center-based industry solutions.