NTT

Nippon Telegraph and Telephone Corporation (also known as Nippon Telegraph and Telephone Corporation, Japanese: Nippon Telegraph and Telephone Corporation, English: NIPPON TELEGRAPH & TELEPHONE, or NTT Corporation) is one of the world's largest telecommunication companies, headquartered in Tokyo, Japan.NTT Corporation was formerly known as Nippon Telegraph and Telephone Corporation (Denshoku Kogyo, one of Japan's three Kogyo companies). NTT is ranked 32nd on the 2013 Fortune 500 list of the world's largest telecom companies, and its subsidiaries include NTT DoCoMo, East Nippon Telegraph and Telephone, West Nippon Telegraph and Telephone, and NTT DATA.