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|Maritime Mobile Service Identity|
From BoatUS, who is authorized to distribute these "Maritime Mobile Service Identity (MMSI) is a unique 9 digit number that is assigned to a (Digital Selective Calling) DSC radio or an AIS unit. Similar to a cell phone number, your MMSI number is your unique calling number for DSC radios or an AIS unit. The information provided when obtaining a MMSI number is transferred into the U.S. Coast Guard's national distress database for use in emergency situations."
See BoatUS.com for more details and FAQ.
You can look up more details about a vessel and its ownership from the MMSI at this FCC link.