Founded 1899
ClassNK (Nippon Kaiji Kyokai)
Tokyo, Japan
ClassNK is a non-profit ship classification society that conducts hull structure, machinery, and equipment surveys against its own technical rules for newbuild and in-service vessels, assigning class notations upon compliance. It is a founding member of the International Association of Classification Societies (IACS).
- Headquarters
- Tokyo, Japan
- Founded
- 1899
- Website
- www.classnk.com
Notable facts
- Traces its origin to the Imperial Marine Association founded in Tokyo in November 1899; relaunched under the Nippon Kaiji Kyokai name in 1946
- Reported to have over 270 million gross tons on register, one of the world's largest classification societies
- Head office located in Tokyo with a secondary office in Chiba, plus branch offices worldwide
Service categories
Sources. This profile is compiled from public reference data, WebSearch-verified againstsource 1 · source 2 · source 3. Data as of 2026-07-11. See methodology.
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