What is an IMO Ship Identification Number?

A permanent number, required under SOLAS regulation XI-1/3 to be marked on all passenger ships of 100 GT and over, and all cargo ships of 300 GT and over, and which remains unchanged on change of flag. It is composed of the letters “IMO” plus a seven-digit number allocated by IHS Fairplay to every sea-going merchant ship of 100 GT and over at the time of build.

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Which ships are not allocated an IMO Ship Identification Number?

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