Nippon Kaiji Kyokai (NK)
(? ?????????, Zaidan-h?jin Nippon Kaiji Ky?kai); a ship classification society. It is also known by the brand name ClassNK or often in the industry as just CNK. It is a not for profit society dedicated to ensuring the safety of life and property at sea, and the prevention of pollution of the marine environment.
By the end of December 2007, the Society had 6,793 ships totalling 152.22 million gross tons under class. This figure represents approximately 20 percent of the world merchant fleet currently under class.
Although based in Japan, ClassNK has worldwide representation through a network of exclusive surveyor offices.