If the vessel has not been assigned an IMO number or a Norwegian call sign prior to registration, these numbers will be allocated by/ via the Department of Ship Registration.

1. Which vessels are assigned IMO numbers?

All vessels of 100 gross tons and upwards shall be assigned an IMO identification number.
Excepted from this provision are barges, pleasure crafts and constructions mentioned in sections 33 and 39 of the Norwegian Maritime Code.


2. Owner and ISM liable manager

ISM managers and registered owners of vessels of 100 GT and above engaged on international voyages are also assigned IMO identifications numbers.

3. Who assigns these unique identifiers?

IHS Maritime & Trade on behalf of the International Maritime Organization (IMO)