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What is an MID?

​The maritime identification digits M1I2D3 are an integral part of the maritime mobile service identity and denote, in principle, the administration responsible for the station so identified. In some cases, M1I2D3 may denote a geographical area under the responsibility of a specific administration. Furthermore, as indicated in Recommendation ITU-R M.585, some maritime identification digits are reserved for maritime devices and do not correspond either to an administration or to a geographical area.
All data concerning MIDs allocated to a country, call sign series, country codes can be found on ITU's GLAD website (database) at: http://www.itu.int/online/mms/glad/cga_mids.sh?lang=en

When can my Administration apply for the second or subsequent MID?

When the resources of a MID allocated to an administration have been exhausted it may request the Radiocommunication Bureau to allocate the second or subsequent MID. However, it should not be requested unless previously allocated MID is more than 80% exhausted in the basic category of three trailing zeros (RR19.36 and RR19.36.1). Administrations seeking additional MID resources must meet the criteria of having notified all previous assignments, in accordance with RR20.16.

Where can I find the "MID" (Maritime Identification Digits) for my country?

​All data concerning MIDs allocated to a country, call sign series, country codes can be found on ITU's GLAD website (database) at:
http://www.itu.int/ITU-R/go/glad/