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Subelement D
DSC & Alpha-Numeric ID:
Section 22
MMSI- MID and Ship Station I.D. Numbers
What is the MID?
  • Mobile Identification Number
  • Marine Indemnity Directory
  • Mobile Interference Digits
  • Correct Answer
    Maritime Identification Digits

What is the MID?

(D). Maritime Identification Digits

See International Telecommunications Union's, ITU, listing of MID's for various countries on
Table of Maritime Identification Digits

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How many digits are in the MID (Maritime Identification Digits)?
  • Correct Answer
    3
  • 7
  • 9
  • 10

How many digits are in the MID (Maritime Identification Digits)?

(A). 3

For example, USA is 338, while Mexico is 345. Also, USA has additional MID's assigned: 366, 367, 368, and 369.

See International Telecommunications Union's, ITU, listing of MID's for various countries on
Table of Maritime Identification Digits

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What does the MID (Maritime Identification Digits) signify?
  • Port of registry
  • Correct Answer
    Nationality
  • Gross tonnage
  • Passenger vessel

What does the MID (Maritime Identification Digits) signify?

(B). Nationality

Countries are assigned 3 digit MIDs. Some countries get also several MIDs, while others only MID.

For example, USA is 338, while Mexico is 345. Also, USA has additional MID's assigned: 366, 367, 368, and 369.

See International Telecommunications Union's, ITU, listing of MID's for various countries on
Table of Maritime Identification Digits

Last edited by markadlerdallas. Register to edit

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Which of the following numbers indicates a U.S. flag ship station?
  • 036627934
  • 243537672
  • Correct Answer
    338426791
  • 003382315

Which of the following numbers indicates a U.S. flag ship station?

(C). 338426791

338 426791
Countries are assigned 3 digit MIDs. Some countries get also several MIDs, while others only MID.

For example, USA is 338, while Mexico is 345. Also, USA has additional MID's assigned: 366, 367, 368, and 369.

See International Telecommunications Union's, ITU, listing of MID's for various countries on
Table of Maritime Identification Digits

Last edited by markadlerdallas. Register to edit

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Which of the following MMSI numbers indicates a U.S. flag ship station?
  • 430326190
  • 033609991
  • Correct Answer
    303236424
  • 257326819

Which of the following MMSI numbers indicates a U.S. flag ship station?

(C). 303236824

303 236824

303 - United States of America - Alaska

Countries are assigned 3 digit MIDs. Some countries get also several MIDs, while others only MID.

For example, USA is 338, while Mexico is 345. Also, USA has additional MID's assigned: 366, 367, 368, and 369.

See International Telecommunications Union's, ITU, listing of MID's for various countries on
Table of Maritime Identification Digits

Last edited by markadlerdallas. Register to edit

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Which of the following numbers indicates a ship station MMSI?
  • 003372694
  • 030356328
  • 3384672
  • Correct Answer
    623944326

Which of the following numbers indicates a ship station MMSI?

(D). 623944326

MID # is 623
MMSI ID # 623944326

The MMSI ID #, or Maritime Mobile Service Identity consists of nine (9) digit code for the DSC's AIS, or the automatic identification systems to identify a vessel's station or coast station. The ship's MMSI ID # is listed in the database of the US Coast Guard distress response system.

See International Telecommunications Union's, ITU, listing of MID's for various countries on
Table of Maritime Identification Digits

Last edited by markadlerdallas. Register to edit

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