The International Telecommunications Union sets many international standards for radio usage around the world. Among these standards are the first characters of broadcast station callsigns. All radio and television broadcasters are assigned callsigns by their country's telecommunications regulatory authority, and are usually required to transmit their callsign at periodic intervals.
Here is the most current list of callsign prefixes assigned by the ITU.
| Call Sign Series | Allocated to |
| AAA-ALZ | United States of America |
| AMA-AOZ | Spain |
| APA-ASZ | Pakistan (Islamic Republic of) |
| ATA-AWZ | India (Republic of) |
| AXA-AXZ | Australia |
| AYA-AZZ | Argentine Republic |
| A2A-A2Z | Botswana (Republic of) |
| A3A-A3Z | Tonga (Kingdom of) |
| A4A-A4Z | Oman (Sultanate of) |
| A5A-A5Z | Bhutan (Kingdom of) |
| A6A-A6Z | United Arab Emirates |
| A7A-A7Z | Qatar (State of) |
| A8A-A8Z | Liberia (Republic of) |
| A9A-A9Z | Bahrain (State of) |
| BAA-BZZ | China (People's Republic of) |
| CAA-CEZ | Chile |
| CFA-CKZ | Canada |
| CLA-CMZ | Cuba |
| CNA-CNZ | Morocco (Kingdom of) |
| COA-COZ | Cuba |
| CPA-CPZ | Bolivia (Republic of) |
| CQA-CUZ | Portugal |
| CVA-CXZ | Uruguay (Eastern Republic of) |
| CYA-CZZ | Canada |
| C2A-C2Z | Nauru (Republic of) |
| C3A-C3Z | Andorra (Principality of) |
| C4A-C4Z | Cyprus (Republic of) |
| C5A-C5Z | Gambia (Republic of the) |
| C6A-C6Z | Bahamas (Commonwealth of the) |
| C7A-C7Z | World Meteorological Organization |
| C8A-C9Z | Mozambique (Republic of) |
| DAA-DRZ | Germany (Federal Republic of) |
| DSA-DTZ | Korea (Republic of) |
| DUA-DZZ | Philippines (Republic of the) |
| D2A-D3Z | Angola (Republic of) |
| D4A-D4Z | Cape Verde (Republic of) |
| D5A-D5Z | Liberia (Republic of) |
| D6A-D6Z | Comoros (Islamic Federal Republic of the) |
| D7A-D9Z | Korea (Republic of) |
| EAA-EHZ | Spain |
| EIA-EJZ | Ireland |
| EKA-EKZ | Armenia (Republic of) |
| ELA-ELZ | Liberia (Republic of) |
| EMA-EOZ | Ukraine |
| EPA-EQZ | Iran (Islamic Republic of) |
| ERA-ERZ | Moldova (Republic of) |
| ESA-ESZ | Estonia (Republic of) |
| ETA-ETZ | Ethiopia (Federal Democratic Republic of) |
| EUA-EWZ | Belarus (Republic of) |
| EXA-EXZ | Kyrgyz Republic |
| EYA-EYZ | Tajikistan (Republic of) |
| EZA-EZZ | Turkmenistan |
| E2A-E2Z | Thailand |
| E3A-E3Z | Eritrea |
| E4A-E4Z | Palestinian Authority |
| FAA-FZZ | France |
| GAA-GZZ | United Kingdom of Great Britain and Northern Ireland |
| HAA-HAZ | Hungary (Republic of) |
| HBA-HBZ | Switzerland (Confederation of) |
| HCA-HDZ | Ecuador |
| HEA-HEZ | Switzerland (Confederation of) |
| HFA-HFZ | Poland (Republic of) |
| HGA-HGZ | Hungary (Republic of) |
| HHA-HHZ | Haiti (Republic of) |
| HIA-HIZ | Dominican Republic |
| HJA-HKZ | Colombia (Republic of) |
| HLA-HLZ | Korea (Republic of) |
| HMA-HMZ | Democratic People's Republic of Korea |
| HNA-HNZ | Iraq (Republic of) |
| HOA-HPZ | Panama (Republic of) |
| HQA-HRZ | Honduras (Republic of) |
| HSA-HSZ | Thailand |
| HTA-HTZ | Nicaragua |
| HUA-HUZ | El Salvador (Republic of) |
| HVA-HVZ | Vatican City State |
| HWA-HYZ | France |
| HZA-HZZ | Saudi Arabia (Kingdom of) |
| H2A-H2Z | Cyprus (Republic of) |
| H3A-H3Z | Panama (Republic of) |
| H4A-H4Z | Solomon Islands |
| H6A-H7Z | Nicaragua |
| H8A-H9Z | Panama (Republic of) |
| IAA-IZZ | Italy |
| JAA-JSZ | Japan |
| JTA-JVZ | Mongolia |
| JWA-JXZ | Norway |
| JYA-JYZ | Jordan (Hashemite Kingdom of) |
| JZA-JZZ | Indonesia (Republic of) |
| J2A-J2Z | Djibouti (Republic of) |
| J3A-J3Z | Grenada |
| J4A-J4Z | Greece |
| J5A-J5Z | Guinea-Bissau (Republic of) |
| J6A-J6Z | Saint Lucia |
| J7A-J7Z | Dominica (Commonwealth of) |
| J8A-J8Z | Saint Vincent and the Grenadines |
| KAA-KZZ | United States of America |
| LAA-LNZ | Norway |
| LOA-LWZ | Argentine Republic |
| LXA-LXZ | Luxembourg |
| LYA-LYZ | Lithuania (Republic of) |
| LZA-LZZ | Bulgaria (Republic of) |
| L2A-L9Z | Argentine Republic |
| MAA-MZZ | United Kingdom of Great Britain and Northern Ireland |
| NAA-NZZ | United States of America |
| OAA-OCZ | Peru |
| ODA-ODZ | Lebanon |
| OEA-OEZ | Austria |
| OFA-OJZ | Finland |
| OKA-OLZ | Czech Republic |
| OMA-OMZ | Slovak Republic |
| ONA-OTZ | Belgium |
| OUA-OZZ | Denmark |
| PAA-PIZ | Netherlands (Kingdom of the) |
| PJA-PJZ | Netherlands (Kingdom of the) - Netherlands Antilles |
| PKA-POZ | Indonesia (Republic of) |
| PPA-PYZ | Brazil (Federative Republic of) |
| PZA-PZZ | Suriname (Republic of) |
| P2A-P2Z | Papua New Guinea |
| P3A-P3Z | Cyprus (Republic of) |
| P4A-P4Z | Netherlands (Kingdom of the) - Aruba |
| P5A-P9Z | Democratic People's Republic of Korea |
| RAA-RZZ | Russian Federation |
| SAA-SMZ | Sweden |
| SNA-SRZ | Poland (Republic of) |
| SSA-SSM | Egypt (Arab Republic of) |
| SSN-STZ | Sudan (Republic of the) |
| SUA-SUZ | Egypt (Arab Republic of) |
| SVA-SZZ | Greece |
| S2A-S3Z | Bangladesh (People's Republic of) |
| S5A-S5Z | Slovenia (Republic of) |
| S6A-S6Z | Singapore (Republic of) |
| S7A-S7Z | Seychelles (Republic of) |
| S8A-S8Z | South Africa (Republic of) |
| S9A-S9Z | Sao Tome and Principe (Democratic Republic of) |
| TAA-TCZ | Turkey |
| TDA-TDZ | Guatemala (Republic of) |
| TEA-TEZ | Costa Rica |
| TFA-TFZ | Iceland |
| TGA-TGZ | Guatemala (Republic of) |
| THA-THZ | France |
| TIA-TIZ | Costa Rica |
| TJA-TJZ | Cameroon (Republic of) |
| TKA-TKZ | France |
| TLA-TLZ | Central African Republic |
| TMA-TMZ | France |
| TNA-TNZ | Congo (Republic of the) |
| TOA-TQZ | France |
| TRA-TRZ | Gabonese Republic |
| TSA-TSZ | Tunisia |
| TTA-TTZ | Chad (Republic of) |
| TUA-TUZ | Côte d'Ivoire (Republic of) |
| TVA-TXZ | France |
| TYA-TYZ | Benin (Republic of) |
| TZA-TZZ | Mali (Republic of) |
| T2A-T2Z | Tuvalu |
| T3A-T3Z | Kiribati (Republic of) |
| T4A-T4Z | Cuba |
| T5A-T5Z | Somali Democratic Republic |
| T6A-T6Z | Afghanistan (Islamic State of) |
| T7A-T7Z | San Marino (Republic of) |
| T8A-T8Z | Palau (Republic of) |
| T9A-T9Z | Bosnia and Herzegovina (Republic of) |
| UAA-UIZ | Russian Federation |
| UJA-UMZ | Uzbekistan (Republic of) |
| UNA-UQZ | Kazakhstan (Republic of) |
| URA-UZZ | Ukraine |
| VAA-VGZ | Canada |
| VHA-VNZ | Australia |
| VOA-VOZ | Canada |
| VPA-VQZ | United Kingdom of Great Britain and Northern Ireland |
| VRA-VRZ | China (People's Republic of) - Honkong |
| VSA-VSZ | United Kingdom of Great Britain and Northern Ireland |
| VTA-VWZ | India (Republic of) |
| VXA-VYZ | Canada |
| VZA-VZZ | Australia |
| V2A-V2Z | Antigua and Barbuda |
| V3A-V3Z | Belize |
| V4A-V4Z | Saint Kitts and Nevis |
| V5A-V5Z | Namibia (Republic of) |
| V6A-V6Z | Micronesia (Federated States of) |
| V7A-V7Z | Marshall Islands (Republic of the) |
| V8A-V8Z | Brunei Darussalam |
| WAA-WZZ | United States of America |
| XAA-XIZ | Mexico |
| XJA-XOZ | Canada |
| XPA-XPZ | Denmark |
| XQA-XRZ | Chile |
| XSA-XSZ | China (People's Republic of) |
| XTA-XTZ | Burkina Faso |
| XUA-XUZ | Cambodia (Kingdom of) |
| XVA-XVZ | Viet Nam (Socialist Republic of) |
| XWA-XWZ | Lao People's Democratic Republic |
| XXA-XXZ | Portugal |
| XYA-XZZ | Myanmar (Union of) |
| YAA-YAZ | Afghanistan (Islamic State of) |
| YBA-YHZ | Indonesia (Republic of) |
| YIA-YIZ | Iraq (Republic of) |
| YJA-YJZ | Vanuatu (Republic of) |
| YKA-YKZ | Syrian Arab Republic |
| YLA-YLZ | Latvia (Republic of) |
| YMA-YMZ | Turkey |
| YNA-YNZ | Nicaragua |
| YOA-YRZ | Romania |
| YSA-YSZ | El Salvador (Republic of) |
| YTA-YUZ | Yugoslavia (Federal Republic of) |
| YVA-YYZ | Venezuela (Republic of) |
| YZA-YZZ | Yugoslavia (Federal Republic of) |
| Y2A-Y9Z | Germany (Federal Republic of) |
| ZAA-ZAZ | Albania (Republic of) |
| ZBA-ZJZ | United Kingdom of Great Britain and Northern Ireland |
| ZKA-ZMZ | New Zealand |
| ZNA-ZOZ | United Kingdom of Great Britain and Northern Ireland |
| ZPA-ZPZ | Paraguay (Republic of) |
| ZQA-ZQZ | United Kingdom of Great Britain and Northern Ireland |
| ZRA-ZUZ | South Africa (Republic of) |
| ZVA-ZZZ | Brazil (Federative Republic of) |
| Z2A-Z2Z | Zimbabwe (Republic of) |
| Z3A-Z3Z | The Former Yugoslav Republic of Macedonia |
| 2AA-2ZZ | United Kingdom of Great Britain and Northern Ireland |
| 3AA-3AZ | Monaco (Principality of) |
| 3BA-3BZ | Mauritius (Republic of) |
| 3CA-3CZ | Equatorial Guinea (Republic of) |
| 3DA-3DM | Swaziland (Kingdom of) |
| 3DN-3DZ | Fiji (Republic of) |
| 3EA-3FZ | Panama (Republic of) |
| 3GA-3GZ | Chile |
| 3HA-3UZ | China (People's Republic of) |
| 3VA-3VZ | Tunisia |
| 3WA-3WZ | Viet Nam (Socialist Republic of) |
| 3XA-3XZ | Guinea (Republic of) |
| 3YA-3YZ | Norway |
| 3ZA-3ZZ | Poland (Republic of) |
| 4AA-4CZ | Mexico |
| 4DA-4IZ | Philippines (Republic of the) |
| 4JA-4KZ | Azerbaijani Republic |
| 4LA-4LZ | Georgia (Republic of) |
| 4MA-4MZ | Venezuela (Republic of) |
| 4NA-4OZ | Yugoslavia (Federal Republic of) |
| 4PA-4SZ | Sri Lanka (Democratic Socialist Republic of) |
| 4TA-4TZ | Peru |
| 4UA-4UZ | United Nations |
| 4VA-4VZ | Haiti (Republic of) |
| 4WA-4WZ | United Nations |
| 4XA-4XZ | Israel (State of) |
| 4YA-4YZ | International Civil Aviation Organization |
| 4ZA-4ZZ | Israel (State of) |
| 5AA-5AZ | Libya (Socialist People's Libyan Arab Jamahiriya) |
| 5BA-5BZ | Cyprus (Republic of) |
| 5CA-5GZ | Morocco (Kingdom of) |
| 5HA-5IZ | Tanzania (United Republic of) |
| 5JA-5KZ | Colombia (Republic of) |
| 5LA-5MZ | Liberia (Republic of) |
| 5NA-5OZ | Nigeria (Federal Republic of) |
| 5PA-5QZ | Denmark |
| 5RA-5SZ | Madagascar (Republic of) |
| 5TA-5TZ | Mauritania (Islamic Republic of) |
| 5UA-5UZ | Niger (Republic of the) |
| 5VA-5VZ | Togolese Republic |
| 5WA-5WZ | Western Samoa (Independent State of) |
| 5XA-5XZ | Uganda (Republic of) |
| 5YA-5ZZ | Kenya (Republic of) |
| 6AA-6BZ | Egypt (Arab Republic of) |
| 6CA-6CZ | Syrian Arab Republic |
| 6DA-6JZ | Mexico |
| 6KA-6NZ | Korea (Republic of) |
| 6OA-6OZ | Somali Democratic Republic |
| 6PA-6SZ | Pakistan (Islamic Republic of) |
| 6TA-6UZ | Sudan (Republic of the) |
| 6VA-6WZ | Senegal (Republic of) |
| 6XA-6XZ | Madagascar (Republic of) |
| 6YA-6YZ | Jamaica |
| 6ZA-6ZZ | Liberia (Republic of) |
| 7AA-7IZ | Indonesia (Republic of) |
| 7JA-7NZ | Japan |
| 7OA-7OZ | Yemen (Republic of) |
| 7PA-7PZ | Lesotho (Kingdom of) |
| 7QA-7QZ | Malawi |
| 7RA-7RZ | Algeria (People's Democratic Republic of) |
| 7SA-7SZ | Sweden |
| 7TA-7YZ | Algeria (People's Democratic Republic of) |
| 7ZA-7ZZ | Saudi Arabia (Kingdom of) |
| 8AA-8IZ | Indonesia (Republic of) |
| 8JA-8NZ | Japan |
| 8OA-8OZ | Botswana (Republic of) |
| 8PA-8PZ | Barbados |
| 8QA-8QZ | Maldives (Republic of) |
| 8RA-8RZ | Guyana |
| 8SA-8SZ | Sweden |
| 8TA-8YZ | India (Republic of) |
| 8ZA-8ZZ | Saudi Arabia (Kingdom of) |
| 9AA-9AZ | Croatia (Republic of) |
| 9BA-9DZ | Iran (Islamic Republic of) |
| 9EA-9FZ | Ethiopia (Federal Democratic Republic of) |
| 9GA-9GZ | Ghana |
| 9HA-9HZ | Malta |
| 9IA-9JZ | Zambia (Republic of) |
| 9KA-9KZ | Kuwait (State of) |
| 9LA-9LZ | Sierra Leone |
| 9MA-9MZ | Malaysia |
| 9NA-9NZ | Nepal |
| 9OA-9TZ | Democratic Republic of the Congo |
| 9UA-9UZ | Burundi (Republic of) |
| 9VA-9VZ | Singapore (Republic of) |
| 9WA-9WZ | Malaysia |
| 9XA-9XZ | Rwandese Republic |
| 9YA-9ZZ | Trinidad and Tobago |
| Call Sign Series | Allocated to |
