The International Telecommunication Union ITU allocates call sign prefixes for radio and television stations of all types. They also form the basis for, but do not exactly match, aircraft registration identifiers. These prefixes are agreed upon internationally, and are a form of country code. A call sign can be any number of letters and numerals but each country must only use call signs that begin with the characters allocated for use in that country. A few countries do not fully comply with these rules. This is through a special agreement  with the government of Chile , which is officially assigned the CB prefix. Many large countries in turn have internal rules on how and where specific subsets of their callsigns can be used such as Mexico's XE for AM and XH for FM radio and television broadcasting , which are not covered here.
Amateur radio call signs are allocated to amateur radio operators around the world. The call signs are used to legally identify the station or operator, with some countries requiring the station call sign to always be used and others allowing the operator call sign instead. The International Telecommunication Union ITU allocates call sign prefixes for radio and television stations of all types. Since these have been used to uniquely identify operators and locate amateur stations within a geographical region or country of the world.
Now playing: Tomas David Hood. Web hfradio. Prefix not found? Perhaps the prefix has been retired.
Use the prefix list below to find primary, secondary, deleted and changed prefixes. Maps are linked here for.. Locations given are a general guide for Amateur Radio use only. They are sometimes used unofficially — such as amateur radio operators operating in a disputed territory or in a nation state that has no official prefix.