Company profile

ClassNK

Service Provider Global Tokyo Japan Official source checked
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ClassNK

Company overview

ClassNK

Company type
Service Provider
Primary location
Tokyo , Japan
Service area
Global
Verification
Official source checked
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Recognition explained

How this profile may be recognised

Featured Partner Promotional visibility or paid placement. This is separate from awards, stars and editorial recommendation.
Verified Business Identity, source or listing information has been checked against available company, public or industry sources.
SYG Recommended An editorial recommendation based on available evidence, relevance and industry context.
Service Badge A service classification showing what the company does, such as brokerage, refit, agency, design or supply.
Stars / Awards Separate Superyacht Guide editorial recognition awarded through published criteria, review and industry research.

Superyacht Guide Recognition

Company / Service Badges

Classification Society Yacht Compliance Yacht Survey Classification Society Yacht Survey Yacht Compliance

Superyacht Guide service labels identify the organisation's main publicly listed yacht, registry, compliance or maritime technical activities.

Last reviewed: May 11, 2026

Company and service badges are editorial indicators. They are not official certification, legal approval, technical approval, safety certification or a paid rating.

Tokyo-based classification society providing class, survey, certification and maritime technical services.

ClassNK, also known as Nippon Kaiji Kyokai, is a Japanese classification society providing maritime classification, survey and certification services. Its official directory lists Tokyo office and department contact details.

The profile is relevant to yacht owners, shipyards, managers and technical teams where classification, survey, certification or maritime technical services are required.

The profile has been created from official ClassNK public information. Superyacht Guide lists ClassNK under Classification Society, Yacht Survey and Yacht Compliance.

Company information

Company type
Service Provider
Primary country
Japan
Primary city
Tokyo
Website
https://www.classnk.or.jp/
Email
boh@classnk.or.jp
Enquiries
boh@classnk.or.jp
Phone
+81 3 5226 2040

Business facts

Business model Service provider

Services and operating profile

Service area
Global
Operating regions
Japan, Asia-Pacific, Europe, Americas, Global
Client focus
Shipowners, yacht owners, managers, shipyards, survey teams, designers and maritime operators.
Core services

Classification, survey, certification, ship management systems and maritime technical services.

Products / services

Classification surveys, certification, ISM/ISPS/MLC support, maritime education, cyber-security and technical approvals.

Specialisms

Japanese classification society with global maritime survey and certification services.

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Locations

Office ยท Headquarters

Tokyo business department

4-7 Kioi-cho, Chiyoda-ku
Tokyo 102-8567
Japan
Phone: +81 3 5226 2040
Email: boh@classnk.or.jp
Website: https://www.classnk.or.jp/

Services at this location:
Classification, survey, certification and maritime technical services.

Listing status

Company listing status

Verification
Official source checked
Last verified
May 11, 2026
Claim status
Unclaimed
Locations
1

Verification and listing information is reviewed from available company, public or industry sources. How Superyacht Guide verifies listings.

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Contact and enquiry

Phone
+81 3 5226 2040

Contact details are shown where available from company, public or industry sources.

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