MO unique company and registered owner identification number. Unique number given to company or registered owner of a vessel. The IMO Unique Company and Registered Owner Identification Number Scheme was introduced through the adoption by the Maritime Safety Committee (MSC), at its seventy-eighth session (12 to 21 May 2004), of resolution MSC.160(78). Its purpose is to assign a permanent number for identification purposes to each company and/or registered owner managing ships of 100 gross tonnage and above engaged on international voyages. Additionally, Administrations are invited to participate in the scheme to the extent they desire by assigning an IMO unique company and registered owner identification number to each company and/or registered owner managing ships of 100 gross tonnage and above not engaged on international voyages. The procedures for the implementation of resolution MSC.160(78) were initially circulated by means of Circular letter No.2554, dated 24 June 2004.

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