Maritime Identification Digits (MID)
MIDs are three digit identifiers ranging from 201 to 775 denoting the administration (country) or geographical area of the administration responsible for the ship station so identified. See the ITU Table of Maritime Identification Digits.
Ships

All ship MMSIs use the format M1I2D3X4X5X6X7X8X9where in the first three digits represent the Maritime Identification Digits (MID) and X is any figure from 0 to 9. (Hint: Ships transmitting with an MMSI not starting with the digits 201-775 are likely doing so improperly, and may be subject to FCC or USCG enforcement action)
Groups of Ships

Group ship station call identities for calling simultaneously more than one ship use the format 01M2I3D4X5X6X7X8X9 , where the first figure is zero and X is any figure from 0 to 9. The MID represents only the territory or geographical area of the administration assigning the group ship station call identity and does not prevent group calls to fleets containing more than one ship nationality.
No process currently exists to assign non-federal group ship station identities. However, users having an MMSI assigned by FCC license, all of which have a trailing zero, may create a group identity by inserting a zero before the identity and removing the trailing zero (e.g. a user having an MMSI of 366123450 is allowed to use the group identity 036612345).
The U.S. Coast Guard group ship station call identity is 036699999.
Coast Radio Stations (Base Stations)

All coast or base stations use the format 0102M3I4D5X6X7X8X9,where the digits 3, 4 and 5 represent the MID and X is any figure from 0 to 9. Groups of coast radio stations use the same format.
The combination 0102M3I4D506070809 is used to address all 00MIDXXXX stations within the administration. The combination 010293949506070809 is used to address all VHF 00XXXXXXX stations worldwide. These two special combinations are not used in the United States.
The U.S. Coast Guard group coast station identity is 003669999.
Search and Rescue Aircraft

AIS and DSC equipment used on search and rescue aircraft use the format 111213M4I5D6X7X8X9 where the digits 4, 5 and 6 represent the MID and X is any figure from 0 to 9. In the United States, these MMSIs are currently only used by the U.S. Coast Guard.
AIS Aids to Navigation (AtoN)

AIS used as an aid to navigation uses the format 9192M3I4D5X6X7X8X9where the digits 3, 4 and 5 represent the MID and X is any figure from 0 to 9. In the United States, these MMSIs are reserved for the federal government.
Craft Associated with a Parent Ship

AIS and DSC equipment used on craft associated with a parent ship, such as a launch, uses the format 9182M3I4D5X6X7X8X9 where the digits 3, 4 and 5 represent the MID and X is any figure from 0 to 9. No provision currently exists for using these identities in the United States. </SPAN></SPAN>
AIS Search and Rescue Transmitter (SART)

AIS search and rescue transmitters (SART) use the format 917203X4X5Y6Y7Y8Y9, where the digits 4 and 5 are assigned by the International Association for Marine Electronics Companies (CIRM) and refer to the SART manufacturer, and digits 6, 7, 8 and 9 are sequential digits assigned by the manufacturer identifying the SART.

MID
Allocated to

201Albania (Republic of)202Andorra (Principality of)203Austria204Azores205Belgium206Belarus (Republic of)207Bulgaria (Republic of)208Vatican City State209, 210Cyprus (Republic of)211Germany (Federal Republic of)212Cyprus (Republic of)213Georgia214Moldova (Republic of)215Malta216Armenia (Republic of)218Germany (Federal Republic of)219, 220Denmark224, 225Spain226, 227, 228France230Finland231Faroe Islands232, 233, 234, 235United Kingdom of Great Britain and Northern Ireland236Gibraltar237Greece238Croatia (Republic of)239, 240, 241Greece242Morocco (Kingdom of)243Hungary (Republic of)244, 245, 246Netherlands (Kingdom of the)247Italy248, 249Malta250Ireland251Iceland252Liechtenstein (Principality of)253Luxembourg254Monaco (Principality of)255Madeira256Malta257, 258, 259Norway261Poland (Republic of)262Montenegro263Portugal264Romania265, 266Sweden267Slovak Republic268San Marino (Republic of)269Switzerland (Confederation of)270Czech Republic271Turkey272Ukraine273Russian Federation274The Former Yugoslav Republic of Macedonia275Latvia (Republic of)276Estonia (Republic of)277Lithuania (Republic of)278Slovenia (Republic of)279Serbia (Republic of)301Anguilla303Alaska (State of)304, 305Antigua and Barbuda306Netherlands Antilles307Aruba308, 309Bahamas (Commonwealth of the)310Bermuda311Bahamas (Commonwealth of the)312Belize314Barbados316Canada319Cayman Islands321Costa Rica323Cuba325Dominica (Commonwealth of)327Dominican Republic329France330Grenada331Greenland332Guatemal a (Republic of)334Honduras (Republic of)336Haiti (Republic of)338United States of America339Jamaica341Saint Kitts and Nevis (Federation of)343Saint Lucia345Mexico347Martinique (French Department of)348Montserrat350Nicaragua351, 352, 353, 354Panama (Republic of)355,356, 357- 358Puerto Rico359El Salvador (Republic of)361Saint Pierre and Miquelon (Territorial Collectivity of)362Trinidad and Tobago364Turks and Caicos Islands366, 367, 368, 369 United States of America370, 371, 372Panama (Republic of)375, 376, 377Saint Vincent and the Grenadines378British Virgin Islands379United States Virgin Islands401Afghanistan403Saudi Arabia (Kingdom of)405Bangladesh (People's Republic of)408Bahrain (Kingdom of)410Bhutan (Kingdom of)412, 413China (People's Republic of)416Taiwan (Province of China)417Sri Lanka (Democratic Socialist Republic of)419India (Republic of)422Iran (Islamic Republic of)423Azerbaijani Republic425Iraq (Republic of)428Israel (State of)431, 432Japan434Turkmenistan436Kazakhstan (Republic of)437Uzbekistan (Republic of)438Jordan (Hashemite Kingdom of)440, 441Korea (Republic of)443Palestine (In accordance with Resolution 99 Rev. Antalya, 2006)445Democratic People's Republic of Korea447Kuwait (State of)450Lebanon451Kyrgyz Republic453Macao (Special Administrative Region of China)455Maldives (Republic of)457Mongolia459Nepal (Federal Democratic Republic of)461Oman (Sultanate of)463Pakistan (Islamic Republic of)466Qatar (State of)468Syrian Arab Republic470United Arab Emirates473, 475Yemen (Republic of)477Hong Kong (Special Administrative Region of China)478Bosnia and Herzegovina501Adelie Land503Australia506Myanmar (Union of)508Brunei Darussalam510Micronesia (Federated States of)511Palau (Republic of)512New Zealand514, 515Cambodia (Kingdom of)516Christmas Island (Indian Ocean)518Cook Islands520Fiji (Republic of)523Cocos (Keeling) Islands525Indonesia (Republic of)529Kiribati (Republic of)531Lao People's Democratic Republic533Malaysia536Northern Mariana Islands (Commonwealth of the)538Marshall Islands (Republic of the)540New Caledonia542Niue544Nauru (Republic of)546French Polynesia548Philippines (Republic of the)553Papua New Guinea555Pitcairn Island557Solomon Islands559American Samoa561Samoa (Independent State of)563, 564, 565Singapore (Republic of)567Thailand570Tonga (Kingdom of)572Tuvalu574Viet Nam (Socialist Republic of)576Vanuatu (Republic of)578Wallis and Futuna Islands601South Africa (Republic of)603Angola (Republic of)605Algeria (People's Democratic Republic of)607Saint Paul and Amsterdam Islands608Ascension Island609Burundi (Republic of)610Benin (Republic of)611Botswana (Republic of)612Central African Republic613Cameroon (Republic of)615Congo (Republic of the)616Comoros (Union of the)617Cape Verde (Republic of)618Crozet Archipelago619Côte d'Ivoire (Republic of)621Djibouti (Republic of)622Egypt (Arab Republic of)624Ethiopia (Federal Democratic Republic of)625Eritrea626Gabonese Republic627Ghana629Gambia (Republic of the)630Guinea-Bissau (Republic of)631Equatorial Guinea (Republic of)632Guinea (Republic of)633Burkina Faso634Kenya (Republic of)635Kerguelen Islands636, 637Liberia (Republic of)642Socialist People's Libyan Arab Jamahiriya644Lesotho (Kingdom of)645Mauritius (Republic of)647Madagascar (Republic of)649Mali (Republic of)650Mozambique (Republic of)654Mauritania (Islamic Republic of)655Malawi656Niger (Republic of the)657Nigeria (Federal Republic of)659Namibia (Republic of)660Reunion (French Department of)661Rwanda (Republic of)662Sudan (Republic of the)663Senegal (Republic of)664Seychelles (Republic of)665Saint Helena666Somali Democratic Republic667Sierra Leone668Sao Tome and Principe (Democratic Republic of)669Swaziland (Kingdom of)670Chad (Republic of)671Togolese Republic672Tunisia674Tanzania (United Republic of)675Uganda (Republic of)676Democratic Republic of the Congo677Tanzania (United Republic of)678Zambia (Republic of)679Zimbabwe (Republic of)701Argentine Republic710Brazil (Federative Republic of)720Bolivia (Plurinational State of)725Chile730Colombia (Republic of)735Ecuador740Falkland Islands (Malvinas)745Guiana (French Department of)750Guyana755Paraguay (Republic of)760Peru765Suriname (Republic of)770Uruguay (Eastern Republic of)775Venezuela (Bolivarian Republic of)