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MARS
http://www.itu.int/ITU-R/terrestrial/mars/index.asp

Find ship names, callsigns, Inmarsat IDs, MMSIs

This database run by the International Telecommunication Union lets you search for information relating to over 400,000 ship stations. MARS stands for Maritime mobile Access and Retrieval System and has been running since MArch 1995.

As well as vessel information, the databse contains contact details of all registered accounting authorities, and administrations responsible for notifying ship station data to the ITU as well as the present status of allocations (call sign series, maritime identification digits (MIDs) for particular geographical areas.

The forms used used for notifying amendments to the List of Coast stations (List IV), List of Ship Stations (List V) and the List of Radiodetermination and special service stations (List VI) are also provided.