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
- Legal name
- Nippon Kaiji Kyokai General Incorporated Foundation (Ippan Zaidan Houjin)
- Employees
- 1,001-5,000 employees
- Phone
- +31-180-643580
- Company page ↗
Geographic coverage
- Asia-Pacific
- Europe
- Middle East
- Africa
- Americas
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
Verified credentials
✓ = confirmed on the accrediting body's own public registry. (unverified) = the provider's own claim, not independently confirmed in a registry. Never take a certification claim at face value; verify directly with the issuing body before you retain a vendor. See methodology.
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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