Ham Radio call signs by country

Call signs in United Kingdom include a three letter country code, and a series of letters and numbers.

Call signs are regulated internationally by the ITU as well as nationally in the UK by 'The Office of Communication', known as Ofcom. It regulates amateur radio in the country as an independent regulator and competition authority for the UK communications industries, with responsibilities across television, radio, telecommunications and wireless communications services. It assigns call signs, issues amateur radio licences, allots frequency spectrum, and monitors the radio waves. Ofcom is no longer responsible for setting and conducting amateur radio exams, which are now run by the Radio Society of Great Britain on their behalf.

The Radio Society of Great Britain (RSGB) is the United Kingdom's recognised national society for amateur radio operators. The society's patron is Prince Philip, Duke of Edinburgh, and it represents the interests of the UK’s licensed radio amateurs.

Call sign blocks for telecommunication[edit]

The International Telecommunication Union has assigned Great Britain the following call sign blocks for all radio communication, broadcasting or transmission:

GAA–GZZ domestic MAA–MZZ domestic VPA–VQZ VSA–VSZ ZBA–ZJZ Gibraltar, Middle East, south Atlantic ZNA–ZOZ ZQA–ZQZ 2AA–2ZZ domestic

Call sign block	Principal use

While not directly related to call signs, the International Telecommunication Union (ITU) further has divided all countries assigned amateur radio prefixes into three regions; Great Britain is located in ITU Region 1.

Call sign assignments for amateur radio[edit]

Amateur radio or ham radio call signs are unique identifiers for the 60, 000 licensed operators. Ofcom allots the individual call signs to the amateurs it licences. Call signs are the property of Ofcom even when assigned.

M3 + 3 Letters Foundation Licence M6 + 3 Letters Foundation Licence 2EØ + 3 Letters Intermediate Licence 2E1 + 3 Letters Intermediate Licence G1 + 3 letters Full Licence G2 + 2 letters Full Licence G2 + 3 letters Full Licence G3 + 2 letters Full Licence G3 + 3 letters Full Licence G4 + 2 letters Full Licence G4 + 3 letters Full Licence G5 + 2 letters Full Licence G6 + 2 letters Full Licence G6 + 3 letters Full Licence G7 + 3 letters Full Licence G8 + 2 letters Full Licence G8 + 3 letters Full Licence GØ + 3 letters Full Licence MØ + 3 letters Full Licence M1 + 3 letters Full Licence M5 + 3 letters Full Licence m/^(G|M)(\S)?\d{1}\S{1}$/ Contest callsign

Prefixes + letters in suffix	Licence class

Callsigns in the G9 series are commercial licences, issued for experimental purposes and these may not be used on the amateur bands (except in the case of a contest callsign).

Regional two-letter prefixes are assigned according to the following table:

Map showing regional indicators. England G M 2E GX MX GB Guernsey GU MU 2U GP MP GB Isle of Man GD MD 2D GT MT GB Jersey GJ MJ 2J GH MH GB Northern Ireland GI MI 2I GN MN GB Scotland GM MM 2M GS MS GB Wales GW MW 2W GC MC GB

Region	G-prefix	M-prefix	Intermediate lic.	G-club prefix	M-club prefix	Special event

Special event call signs[edit]

Ofcom reserves the right to issue temporary special event call signs to licensed amateurs holding a full licence.

Special event call signs are issued with a 'GB' prefix, but others like GQ, GO, MQ, GA, MO and 2O have been issued in special cases. Ofcom also allows numerals in special event call sign suffixes. For instance GB75RD was a special event sign for the 75th anniversary of the Reading and District Amateur radio club. More recently Ofcom have agreed to what was a very special arrangement for the use of the Special Event Station call sign Gx100RSGB during 2013 to mark the 100th anniversary of the RSGB (where "x" is replaced by the secondary location identifier, M, W, I, D, U and J, etc. but never with B to form the typical 'GB' prefix for other special events.)

Exceptionally, call signs taking the form 'GB3xx' are usually allocated to repeaters whilst beacons usually take the 'GB3xxx' form.

Reciprocal agreements[edit]

Holders of licences in countries signed up to CEPT TR 61-01 operate with their home call sign prefixed with an M/ plus the additional country identifier when necessary (e.g. MM, MI, MW etc.). Holders of licences in countries signed up to CEPT TR 61-02 can operate for 3 months before needing a Great Britain call sign as issued by Ofcom.