ADM-008 - Integrated IMO Identification Number Scheme (ship and company)

Edition
06/26
Last updated

15 June 2026

Marine Notice 06/26

Rev. 06/26

TO:

ALL SHIPOWNERS, OPERATORS, MASTERS AND OFFICERS OF

MERCHANT SHIPS, AGENTS, LIBERIAN AUDITORS

RECOGNIZED ORGANIZATIONS

AND

SUBJECT:

Integrated IMO Identification Number Scheme (ship and company)

Reference:

  1. IMO Resolution A.1215(34), 03 December 2025
  2. IMO Resolution MSC.194(80), 20 May 2005
  3. IMO Circular Letter 5096, 27 February 2026
  4. SOLAS Chapter XI-1, Regulations 3-1 and 5
  5. SOLAS Chapter IX, Regulation 1, the ISM Code

Supersedes: Marine Notice ADM-008, dated 06/12 The following changes have been included:

  1. References (a) and (c) have been updated.
  2. The PURPOSE has been updated for these new references and scheme.
  3. APPLICABILITY has been deleted as same is now contained in the PURPOSE.
  4. REQUIREMENTS section changed to MANAGING THE SHIP

IDENTIFICATION NUMBER and remaining content updated to reflect new number scheme throughout.

PURPOSE:

The purpose of this Notice is to provide guidance on regulations XI-1/3 and XI-1/3-1 of SOLAS, 1978, as amended, that requires all passenger ships of 100 gross tonnage and upwards and all cargo ships of 300 gross tonnage and upwards to be provided with an identification number, and every Company and registered owner of ships to which SOLAS Chapter I applies, to be provided with an identification number which conforms to the Integrated IMO Identification Number Scheme adopted by the International Maritime Organization. The Integrated IMO Identification Number Scheme was adopted to enhance maritime safety, security and environmental protection, and to facilitate the prevention of maritime fraud, and harmonizes the two previous schemes, i.e. the IMO Ship Identification Number Scheme and the IMO Unique Company and Registered Owner Identification Number Scheme.

Inquiries concerning the subject of this Notice should be directed to the Office of the Deputy Commissioner, Republic of

Liberia, the Liberian International Ship & Corporate Registry, 22980 Indian Creek Drive., Suite 200, Dulles, VA 20166,

USA. The most current version of all Marine Notices are available in the Online Library at: http://www.liscr.com

MANAGING THE SHIP IDENTIFICATION NUMBER:

    1. Management
    2. S&P Global Limited is the service provider responsible for the allocation and management of the IMO Ship Identification Number in parallel with the IMO Unique Company and Registered Owner Identification Number Scheme.
    3. Any entity, such as shipowners, operators or shipyards, may request the allocation of an IMO number or the updating of data associated with an existing number by submitting an application to S&P Global Limited.
    4. The individual number of a ship remains unchanged during the entire life of the ship, even in case of change of flag, name, ownership, or type and a deleted IMO Ship Identification Number will not be reallocated.
    5. Obtaining Numbers
    6. Requests are submitted via the following website https://imonumbers.ihs.com/. The data to be submitted are presented in annex 1 of reference (c). Information on the submission process, including all available methods, is also available on the website.
    7. The entity applying for the allocation of an IMO Ship Identification Number should inform the flag State Administration within one month of the application.
    8. Requesters are recommended, prior to forwarding their requests to S&P Global Limited, to verify (through checking the ship's documentation) whether an identification number has already been assigned in order to facilitate the assignment of the identification numbers to existing ships and to avoid duplication of an IMO ship identification number. It should be borne in mind that an identification number may have already been issued by S&P Global Limited at the request of a classification society or the shipyard concerned.

MANAGING THE COMPANY AND REGISTERED OWNER IDENTIFICATION NUMBERS

    1. Management
    2. S&P Global Limited is the service provider responsible for the allocation and management of the IMO Unique Company and Registered Owner Identification Number Scheme in parallel with the IMO Ship Identification Number Scheme. "Company" has the same meaning as in SOLAS regulation IX/1 and "Registered owner" is the owner specified on the ship’s certificate of registry issued by the flag State.
    3. Any companies or registered owners may request the allocation of an IMO unique company and registered owner identification number or the updating of data associated with an existing number by submitting an application to S&P Global Limited directly.
    4. Once assigned, the Number remains unchanged for a Company and/or registered owner. When Companies and/or registered owners merge, as a matter of general policy, the

Number of the larger company and/or registered owner is assigned to the new amalgamated

ADM-008 2 of 3 06/26

The Republic of Liberia

entity, while the Number of the smaller entity is frozen and not re-used. If a new legal entity is formed as a result of the merger, a new company IMO number will be issued.

    1. Original information about a Company and/or registered owner will be collected by the Administration at the time of registration. The information collected is that which the Administration ordinarily collects during the registration process, namely:
      1. company/registered owner name-styles;
      2. country/State of incorporation (registration);
      3. date of incorporation; and
      4. full address (operational address) and contact details.
    2. Obtaining Numbers
    3. Companies and/or registered owners that will manage ships covered by the scheme may request a Number by submitting the request at the website https://imonumbers.ihs.com/. The data to be submitted are presented in annex 2 of reference (c). In order to avoid delays in issuance of the CSR, DOC, SMC and/or ISSC, Companies are strongly encouraged to obtain their Number at the earliest opportunity.
    4. The companies and registered owners applying for the allocation of a number should inform the relevant Administration within one month from the date of the application.
    5. Obtaining numbers for existing Companies and/or registered owners, or for communicating corrected company details on existing records, on an individual basis may also be made at https://imonumbers.ihs.com/.
    6. Additionally, assigned numbers are available for look up in the IMO Global Integrated Shipping Information System (GISIS) at https://gisis.imo.org/Members/SHIPS/ Default.aspx.
    7. The Administration assumes no responsibility to examine, correct, change, alter, or modify information contained on the website, or to notify IMO or S&P Global Limited of incorrect information contained on the website. The Administration shall also not be liable for mistakes or errors in the information on the website.

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ADM-008 3 of 3 06/26

The Republic of Liberia

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