Maritime mobile service identity information

Why you need a maritime mobile service identity (MMSI), and how to apply for one.

We allocate maritime mobile service identity numbers (MMSI’s) to people who own a vessel or unit that has either:

  • digital selective calling (DSC) capable equipment
  • automatic identification system (AIS) units.
What is an MMSI?
Why you need an MMSI
How to apply for an MMSI
MMSI online application forms
MMSI enquiries
DSC identification
MMSI formats
Diver locating systems using AIS
Summary of Australian MMSI formats in current usage
Operator qualifications and licence requirements
Maritime communication station facilities for DSC
Small craft proceeding overseas
Search for MMSI
Further information