How many digits does an MMSI number contain?

The Maritime Mobile Service Identity (MMSI) number consists of 9 digits. This unique identification number is assigned to ship stations for use in maritime communication, particularly via systems such as AIS (Automatic Identification System) and DSC (Digital Selective Calling). The structure of the MMSI ensures that each number is distinct and can be used to identify a vessel in various communication systems, enhancing safety and coordination among maritime operators.

The choice of 9 digits allows for a large range of possible combinations, sufficient to accommodate the needs of the global maritime community while avoiding duplications. This configuration is standardized internationally to ensure consistency across different countries and systems used in maritime operations.