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The First Digit of an MMSI
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The first digit or two of an MMSI means something, and from it you can tell something about the identity:
First digit(s) Meaning 0X Ship Group identity 00 Coast station, or Group of Coast Stations 1 Not used (the seven digit identity begining with " 1" is used by Inmarsat A) 2 These are valid MMSI's used by individual ships. ". " 7 " 8 Assigned for Regional Use 9 Assigned for National Use
Maritime Identification Digits (MID)
A single MID has been allocated to each country. A second MID can be assigned once the MID first or subsequently allocated is more than 80% exhausted and the rate of assignments is such that 90% exhaustion is foreseen. A listing of MIDs assigned to each country is provided in table 1 to Appendix 43 of the ITU Radio Regulations.
A MID always starts with a digit from 2 to 7.
Ship Station Identities
The 9-digit code constituting a ship station identity is formed as follows:
MIDXXXXXX
wherein MID represent the Maritime Identification Digits and X is any figure from 0 to 9.
If the ship is fitted with an Inmarsat B, C or M ship earth station, or it is expected to be so equipped in the foreseeable future, then the identity should have three trailing zeros:
MIDXXX000
If the ship is fitted with an Inmarsat C ship earth station, or it is expected to be so equipped in the foreseeable future, then the identity could have one trailing zeros:
MIDXXXXX0
If the ship is fitted with an Inmarsat A ship earth station, or has satellite equipment other than Inmarsat, then the identity needs no trailing zero.
Group Ship Station Call Identities
Group ship station call identities for calling simultaneously more than one ship are formed as follows:
MIDXXXXX
where the first figure is zero and X is any figure from 0 to 9. The particular MID represents only the country assigning the group ship station call identity and so does not prevent group calls to fleets containing more than one ship nationality.
Coast Station Identities
Coast station identities are formed as follows:
MIDXXXX
where the first two figures are zeros and X is any figure from 0 to 9. The MID reflects the country in which the coast station or coast earth station is located.
Group Coast Station Call Identities
Group coast station call identities for calling simultaneously more than one coast station are formed as a subset of coast station identities, as follows:
00MIDXXXX
where the first two figures are zeros and X is any figure from 0 to 9.
5.
IAMSAR Manual: (extract from: https://rofficer.narod.ru/docs/iamsar_c.htm)