The radiocommunication division of the International Telecommunication Union uses the following letter codes to identify its member countries. Eight countries are assigned single-letter codes (
Brazil, 
Germany, 
Spain, 
France,, 
Italy, 
Japan, 
Sweden), while the rest have codes three letters in length.
| Country | ||
| A | ||
|---|---|---|
| AFG |  Afghanistan | |
| AFS |  South Africa (Republic of) | |
| AGL |  Angola (Republic of) | |
| ALB |  Albania (Republic of) | |
| ALG |  Algeria (People's Democratic Republic of) | |
| AND |  Andorra (Principality of) | |
| ARG |  Argentina | |
| ARM |  Armenia (Republic of) | |
| ARS |  Saudi Arabia (Kingdom of) | |
| ATG |  Antigua and Barbuda | |
| AUS |  Australia | |
| AUT |  Austria | |
| AZE |  Azerbaijan (Republic of) | |
| B | ||
| B | Brazil (Federative Republic of) | |
| BAH |  Bahamas (Commonwealth of the) | |
| BDI |  Burundi (Republic of) | |
| BEL |  Belgium | |
| BEN |  Benin (Republic of) | |
| BFA |  Burkina Faso | |
| BGD |  Bangladesh (People's Republic of) | |
| BHR |  Bahrain (Kingdom of) | |
| BIH |  Bosnia and Herzegovina | |
| BLR |  Belarus (Republic of) | |
| BLZ |  Belize | |
| BOL | (Plurinational State of) | |
| BOT |  Botswana (Republic of) | |
| BRB |  Barbados | |
| BRM |  Myanmar (Union of) | |
| BRU |  Brunei Darussalam | |
| BTN |  Bhutan (Kingdom of) | |
| BUL |  Bulgaria (Republic of) | |
| C | ||
| CAF |  Central African Republic | |
| CAN |  Canada | |
| CBG |  Cambodia (Kingdom of) | |
| CHL |  Chile | |
| CHN |  China (People's Republic of) | |
| CLM |  Colombia (Republic of) | |
| CLN |  Sri Lanka (Democratic Socialist Republic of) | |
| CME |  Cameroon (Republic of) | |
| COD | ||
| COG | (Republic of the) | |
| COM |  Comoros (Union of the) | |
| CPV |  Cape Verde (Republic of) | |
| CTI |  Cote d'Ivoire (Republic of) | |
| CTR |  Costa Rica | |
| CUB |  Cuba | |
| CVA | ||
| CYP |  Cyprus (Republic of) | |
| CZE |  Czech Republic | |
| D | ||
| D | Germany (Federal Republic of) | |
| DJI |  Djibouti (Republic of) | |
| DMA |  Dominica (Commonwealth of) | |
| DNK |  Denmark | |
| DOM |  Dominican Republic | |
| E | ||
| E | Spain | |
| EGY |  Egypt (Arab Republic of) | |
| EQA |  Ecuador | |
| ERI |  Eritrea | |
| EST |  Estonia (Republic of) | |
| ETH |  Ethiopia (Federal Democratic Republic of) | |
| F | ||
| F | France | |
| FIN |  Finland | |
| FJI |  Fiji (Republic of) | |
| FSM | (Federated States of) | |
| G | ||
| G | ||
| GAB |  Gabon | |
| GEO | ||
| GHA |  Ghana | |
| GMB |  Gambia (Republic of the) | |
| GNB |  Guinea-Bissau (Republic of) | |
| GNE |  Equatorial Guinea (Republic of) | |
| GRC |  Greece | |
| GRD |  Grenada | |
| GTM |  Guatemala (Republic of) | |
| GUI |  Guinea (Republic of) | |
| GUY |  Guyana | |
| H | ||
| HND |  Honduras (Republic of) | |
| HNG |  Hungary | |
| HOL |  Netherlands (Kingdom of the) | |
| HRV |  Croatia (Republic of) | |
| HTI |  Haiti (Republic of) | |
| I | ||
| I | Italy | |
| IND |  India (Republic of) | |
| INS |  Indonesia (Republic of) | |
| IRL | ||
| IRN | (Islamic Republic of) | |
| IRQ |  Iraq (Republic of) | |
| ISL |  Iceland | |
| ISR |  Israel (State of) | |
| J | ||
| J | Japan | |
| JMC |  Jamaica | |
| JOR |  Jordan (Hashemite Kingdom of) | |
| K | ||
| KAZ |  Kazakhstan (Republic of) | |
| KEN |  Kenya (Republic of) | |
| KGZ |  Kyrgyzstan | |
| KIR |  Kiribati (Republic of) | |
| KNA |  Saint Kitts and Nevis (Federation of) | |
| KOR | (Republic of) | |
| KRE | Democratic People's Republic of Korea | |
| KWT |  Kuwait (State of) | |
| L | ||
| LAO | ||
| LBN |  Lebanon | |
| LBR |  Liberia (Republic of) | |
| LBY |  Libya (State of) | |
| LCA |  Saint Lucia | |
| LIE |  Liechtenstein (Principality of) | |
| LSO |  Lesotho (Kingdom of) | |
| LTU |  Lithuania (Republic of) | |
| LUX |  Luxembourg | |
| LVA |  Latvia (Republic of) | |
| M | ||
| MAU |  Mauritius (Republic of) | |
| MCO |  Monaco (Principality of) | |
| MDA | (Republic of) | |
| MDG |  Madagascar (Republic of) | |
| MEX |  Mexico | |
| MHL |  Marshall Islands (Republic of the) | |
| MKD | (Republic of) | |
| MLA |  Malaysia | |
| MLD |  Maldives (Republic of) | |
| MLI |  Mali (Republic of) | |
| MLT |  Malta | |
| MNE |  Montenegro | |
| MNG |  Mongolia | |
| MOZ |  Mozambique (Republic of) | |
| MRC |  Morocco (Kingdom of) | |
| MTN |  Mauritania (Islamic Republic of) | |
| MWI |  Malawi | |
| N | ||
| NCG |  Nicaragua | |
| NGR |  Niger (Republic of the) | |
| NIG |  Nigeria (Federal Republic of) | |
| NMB |  Namibia (Republic of) | |
| NOR |  Norway | |
| NPL |  Nepal (Federal Democratic Republic of) | |
| NRU |  Nauru (Republic of) | |
| NZL |  New Zealand | |
| O | ||
| OMA |  Oman (Sultanate of) | |
| P | ||
| PAK |  Pakistan (Islamic Republic of) | |
| PHL |  Philippines (Republic of the) | |
| PNG |  Papua New Guinea | |
| PNR |  Panama (Republic of) | |
| POL |  Poland (Republic of) | |
| POR |  Portugal | |
| PRG |  Paraguay (Republic of) | |
| PRU |  Peru | |
| Q | ||
| QAT |  Qatar (State of) | |
| R | ||
| ROU |  Romania | |
| RRW |  Rwanda (Republic of) | |
| RUS |  Russian Federation | |
| S | ||
| S | Sweden | |
| SDN |  Sudan (Republic of the) | |
| SEN |  Senegal (Republic of) | |
| SEY |  Seychelles (Republic of) | |
| SLM |  Solomon Islands | |
| SLV |  El Salvador (Republic of) | |
| SMO |  Samoa (Independent State of) | |
| SMR |  San Marino (Republic of) | |
| SNG |  Singapore (Republic of) | |
| SOM |  Somalia (Federal Republic of) | |
| SRB |  Serbia (Republic of) | |
| SRL |  Sierra Leone | |
| SSD | (Republic of) | |
| STP | (Democratic Republic of) | |
| SUI |  Switzerland (Confederation of) | |
| SUR |  Suriname (Republic of) | |
| SVK |  Slovakia | |
| SVN |  Slovenia (Republic of) | |
| SWZ | (Kingdom of) | |
| SYR | ||
| T | ||
| TCD |  Chad (Republic of) | |
| TGO |  Togo | |
| THA |  Thailand | |
| TJK |  Tajikistan (Republic of) | |
| TKM |  Turkmenistan | |
| TLS |  Timor-Leste (Democratic Republic of) | |
| TON |  Tonga (Kingdom of) | |
| TRD |  Trinidad and Tobago | |
| TUN |  Tunisia | |
| TUR |  Turkey | |
| TUV |  Tuvalu | |
| TZA | (United Republic of) | |
| U | ||
| UAE |  United Arab Emirates | |
| UGA |  Uganda (Republic of) | |
| UKR |  Ukraine | |
| URG |  Uruguay (Eastern Republic of) | |
| USA | ||
| UZB |  Uzbekistan (Republic of) | |
| V | ||
| VCT |  Saint Vincent and the Grenadines | |
| VEN | (Bolivarian Republic of) | |
| VTN | (Socialist Republic of) | |
| VUT |  Vanuatu (Republic of) | |
| W | ||
| X | ||
| Y | ||
| YEM |  Yemen (Republic of) | |
| Z | ||
| ZMB |  Zambia (Republic of) | |
| ZWE |  Zimbabwe (Republic of) | |
The ITU also designates the following codes for other areas around the world that are not member states.
| Area | ||
| A | ||
|---|---|---|
| ABW |  Aruba | |
| AIA |  Anguilla | |
| ALS | (State of) | |
| AMS | Saint Paul and Amsterdam Islands | |
| AOE | / Western Sahara | |
| ASC | ||
| ATA | ||
| AZR | ||
| B | ||
| BER |  Bermuda | |
| BIO | Chagos Islands (Indian Ocean) | |
| BLM | (French Department of) | |
| BVT |  Bouvet Island | |
| C | ||
| CG7 | CUB(Guantanamo) (7).[1] | |
| CHR |  Christmas Island (Indian Ocean) | |
| CKH |  Cook Islands | |
| CNR | ||
| CPT | ||
| CRO | Crozet Archipelago | |
| CYM |  Cayman Islands | |
| D | ||
| DGA | Diego Garcia | |
| E | ||
| F | ||
| FLK | (Malvinas) | |
| FRO |  Faroe Islands | |
| G | ||
| GCA |  United Kingdom (Non-metropolitan) – Region 1 | |
| GCC | United Kingdom – Region 3 | |
| GIB |  Gibraltar | |
| GRL |  Greenland | |
| GUF |  French Guiana (French Department of) | |
| GUM |  Guam | |
| H | ||
| HKG |  Hong Kong (Special Administrative Region of China) | |
| HMD | ||
| HWA | (State of) | |
| HWL | ||
| I | ||
| ICO |  Cocos (Keeling) Islands | |
| J | ||
| JAR | ||
| JON | ||
| K | ||
| KER | Kerguelen Islands | |
| L | ||
| M | ||
| MAC | (Special Administrative Region of China) | |
| MDR | ||
| MDW | ||
| MRA |  Northern Mariana Islands (Commonwealth of the) | |
| MRN | Marion Island | |
| MRT |  Martinique (French Department of) | |
| MSR |  Montserrat | |
| MYT |  Mayotte (Territorial Collectivity of) | |
| N | ||
| NCL |  New Caledonia | |
| NFK |  Norfolk Island | |
| NIU |  Niue | |
| O | ||
| OCE |  French Polynesia | |
| P | ||
| PAQ | ||
| PHX | Phoenix Islands | |
| PLM | Palmyra Island | |
| PLW |  Palau (Republic of)[2] | |
| PTC | ||
| PTR |  Puerto Rico | |
| Q | ||
| R | ||
| REU |  Reunion (French Department of) | |
| ROD | Rodrigues | |
| S | ||
| SCG | ex → SRB, MNE | |
| SHN | ||
| SMA |  American Samoa | |
| SPM |  Saint Pierre and Miquelon (Territorial Collectivity of) | |
| SWN | Swan Islands | |
| SXM | (Dutch part) | |
| T | ||
| TCA |  Turks and Caicos Islands | |
| TKL |  Tokelau | |
| TRC | ||
| U | ||
| V | ||
| VIR | ||
| VRG | ||
| W | ||
| WAK | ||
| WAL |  Wallis and Futuna | |
| X | ||
| XAA | shared throughout the world | |
| XAX | shared by several countries, but in a restricted area of the world | |
| XBR | special use | |
| XBY | / Abyei area | |
| XCQ | ex Caroline Islands → FSM + PLW | |
| XCS | ex TCH → CZE + SVK | |
| XGZ | ||
| XMM | inter-ship communications | |
| XOA | International Civil Aviation Organization | |
| XR1 | Region 1 (RR 5.3) | |
| XR2 | Region 2 (RR 5.4) | |
| XR3 | Region 3 (RR 5.5) | |
| XRY | (RR AP 26/5.2) | |
| XSC | ex SCG | |
| XSD | ex Republic of the Sudan before 14 July 2011 → SDN + SSD | |
| XSP | Spratly Islands | |
| XSU | ex URS → RUS + … | |
| XUN | ||
| XWB | ||
| XWM | World Meteorological Organization | |
| XYU | ex YUG → SCG… + HRV + BIH + SVN | |
| XYZ | pending further developments regarding the administration responsible | |
| XZZ | administrative status is subject to special arrangements | |
| Y | ||
| Z | ||