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For example, the United States is assigned KA–KZ, and therefore can also use prefixes like K1 or K9. While ITU prefix rules are adhered to in the context of international broadcasting, including amateur radio, it is rarer for countries to assign broadcast call signs to conventional AM, FM, and television stations with purely domestic reach ...
The ITU has assigned to India call-sign blocks 8TA to 8YZ, VUA to VWZ, and ATA to AWZ. VU call-signs are listed according to licence grade: for General (formerly the Advanced Grade and Grade–I) licence holders, the call-sign prefix is VU2; for Restricted (formerly Grade–II and Grade–II Restricted) licence holders, the prefix is VU3.
Note: In the table of allocation, the first two characters of each call sign (whether two letters or one number and one letter, in that order) identify the nationality of the station. In certain instances where the complete alphabetical block is allocated to a single nation, the first letter is sufficient for national identity.
Linked country codes are from ISO 3166-1. Series allocated to an international organization. Provisional allocation in accordance with No. S19.33: "Between radiocommunication conferences, the Secretary-General is authorized to deal with questions relating to changes in the allocation of series of call signs, on a provisional basis, and subject to confirmation by the following conference."
Call sign prefixes are coordinated internationally by the International Telecommunication Union (ITU), and Canada has been assigned CF–CK, VA–VG, VO, VX-VY and XJ–XO. "CB" series calls are officially assigned to Chile by the ITU, but Canada makes de facto use of this series for stations belonging to, but not exclusively broadcasting ...
The call sign format for radio and television call signs follows a number of conventions. All call signs begin with a prefix assigned by the International Telecommunication Union (ITU). For example, the United States has been assigned the following prefixes: AAA – ALZ , K , N , W .
Call sign information for U.S. stations are set out in chapter I of the FCC rules, Title 47 (Telecommunication) of the Code of Federal Regulations (C.F.R.): 47 CFR 2.302: General overview of call sign assignments, including a detailed summary of standards and practices for various license classes.
Holders of licences in countries signed up to CEPT TR 61-01 [15] 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 [16] can operate for 3 months before needing a Great Britain call sign as issued by Ofcom.