21Vianet Group, Inc. operates as a carrier-neutral Internet data center services provider in China. It provides hosting and related services, managed network services and cloud computing infrastructure. The Company's infrastructure is interconnected with the networks operated by all of China's telecommunications carriers, major non-carriers and local Internet service providers, or ISPs. 21Vianet Group, Incorporation. Its customers include Internet companies, government entities, blue-chip enterprises, and small-to mid-sized enterprises. 21Vianet Group, Inc. is headquartered in Beijing, the Peoples' Republic of China.