| Example: 9619907 (IMO of Maersk Mc-Kinney Moller) |
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 | International Maritime Organization (IMO) numbers are a unique reference for ships and for registered ship owners and management companies. They were introduced under the SOLAS Convention to improve maritime safety and security and to reduce maritime fraud. For ships, the IMO number remains linked to the hull for its lifetime, regardless of a change in name, flag, or owner. The ship number consists of the three letters "IMO" followed by a unique seven-digit number assigned to sea-going merchant ships under the International Convention for the Safety of Life at Sea (SOLAS). When introduced, the IMO adopted the existing unique ship numbers applied to ships listed by Lloyd's Register since 1963. IMO ship identification numbers are assigned by IHS Fairplay (previously Lloyd's Register-Fairplay). For new vessels the IMO number is assigned to a hull during construction, generally upon keel laying. Many vessels which fall outside the mandatory requirements of SOLAS have numbers allocated by Lloyd's Register or IHS Fairplay in the same numerical series, including fishing vessels and commercial yachts. The IMO ship identification number is made of the three letters "IMO" followed by the seven-digit number. This consists of a six-digit sequential unique number followed by a check digit. The integrity of an IMO number can be verified using its check digit. This is done by multiplying each of the first six digits by a factor of 2 to 7 corresponding to their position from right to left. The rightmost digit of this sum is the check digit. For example, for IMO 9074729: (9×7) + (0×6) + (7×5) + (4×4) + (7×3) + (2×2) = 139. |