| United States | US |
| Afghanistan | AF |
| Akrotiri Sovereign Base Area | AX |
| Albania | AL |
| Algeria | AG |
| Andorra | AN |
| Angola | AO |
| Anguilla | AV |
| Antarctica | AY |
| Antigua and Barbuda | AC |
| Argentina | AR |
| Armenia | AM |
| Aruba | AA |
| Ashmore and Cartier Islands | AT |
| Australia | AS |
| Austria | AU |
| Azerbaijan | AJ |
| Bahamas | BF |
| Bahrain | BA |
| Baker Island | FQ |
| Bangladesh | BG |
| Barbados | BB |
| Bassas da India | BS |
| Belarus | BO |
| Belgium | BE |
| Belize | BH |
| Benin | BN |
| Bermuda | BD |
| Bhutan | BT |
| Bolivia | BL |
| Bosnia-Herzegovina | BK |
| Botswana | BC |
| Bouvet Island | BV |
| Brazil | BR |
| British Indian Ocean Territory | IO |
| Brunei | BX |
| Bulgaria | BU |
| Burkina Faso | UV |
| Burma | BM |
| Burundi | BY |
| Cambodia | CB |
| Cameroon | CM |
| Canada | CA |
| Cape Verde | CV |
| Cayman Islands | CJ |
| Central African Republic | CT |
| Chad | CD |
| Chile | CI |
| China, People's Republic of | CH |
| Christmas Island (Indian Ocean) | KT |
| Clipperton Island | IP |
| Cocos (Keeling) Islands | CK |
| Colombia | CO |
| Comoros | CN |
| Congo (Democratic Republic of) | CG |
| Congo (Republic of) | CF |
| Cook Islands | CW |
| Coral Sea Islands Territory | CR |
| Costa Rica | CS |
| Cote d'ivoire (Ivory Coast) | IV |
| Croatia | HR |
| Cuba | CU |
| Curacao | UC |
| Cyprus | CY |
| Czech Republic | EZ |
| Denmark | DA |
| Dhekelia Sovereign Base Area | DX |
| Djibouti | DJ |
| Dominica | DO |
| Dominican Republic | DR |
| Ecuador | EC |
| Egypt | EG |
| El Salvador | ES |
| England | UK |
| Equatorial Guinea | EK |
| Eritrea | ER |
| Estonia | EN |
| Ethiopia | ET |
| Europa Island | EU |
| Falkland Islands (Islas Malvinas) | FK |
| Faroe Islands | FO |
| Fiji | FJ |
| Finland | FI |
| France | FR |
| French Guiana | FG |
| French Polynesia | FP |
| French Southern and Antarctic Lands | FS |
| Gabon | GB |
| Gambia | GA |
| Gaza Strip | GZ |
| Georgia | GG |
| Germany | GM |
| Ghana | GH |
| Gibraltar | GI |
| Glorioso Islands | GO |
| Greece | GR |
| Greenland | GL |
| Grenada | GJ |
| Guadeloupe | GP |
| Guatemala | GT |
| Guernsey | GK |
| Guinea | GV |
| Guinea-Bissau | PU |
| Guyana | GY |
| Haiti | HA |
| Heard Island and McDonald Island | HM |
| Honduras | HO |
| Hong Kong | HK |
| Howland Island | HQ |
| Hungary | HU |
| Iceland | IC |
| India | IN |
| Indonesia | ID |
| Iran | IR |
| Iraq | IZ |
| Ireland | EI |
| Israel | IS |
| Italy | IT |
| Jamaica | JM |
| Jan Mayan | JN |
| Japan | JA |
| Jarvis Island | DQ |
| Jersey | JE |
| Johnston Atoll | JQ |
| Jordan | JO |
| Juan de Nova Island | JU |
| Kazakhstan | KZ |
| Kenya | KE |
| Kingman Reef | KQ |
| Kiribati | KR |
| Korea, Democratic People's Republic of (North) | KN |
| Korea, Republic of (South) | KS |
| Kosovo | KV |
| Kuwait | KU |
| Kyrgyzstan | KG |
| Laos | LA |
| Latvia | LG |
| Lebanon | LE |
| Lesotho | LT |
| Liberia | LI |
| Libya | LY |
| Liechtenstein | LS |
| Lithuania | LH |
| Luxembourg | LU |
| Macau | MC |
| Macedonia | MK |
| Madagascar | MA |
| Malawi | MI |
| Malaysia | MY |
| Maldives | MV |
| Mali | ML |
| Malta | MT |
| Man, Isle of | IM |
| Marshall Islands | RM |
| Martinique | MB |
| Mauritania | MR |
| Mauritius | MP |
| Mayotte | MF |
| Mexico | MX |
| Micronesia, Federated States of | FM |
| Midway Islands | MQ |
| Moldova | MD |
| Monaco | MN |
| Mongolia | MG |
| Montenegro | MJ |
| Montserrat | MH |
| Morocco | MO |
| Mozambique | MZ |
| Namibia | WA |
| Nauru | NR |
| Navassa Island | BQ |
| Nepal | NP |
| Netherlands | NL |
| New Caledonia | NC |
| New Zealand | NZ |
| Nicaragua | NU |
| Niger | NG |
| Nigeria | NI |
| Niue | NE |
| No Man's Land | NM |
| Norfolk Island | NF |
| Northern Ireland | UK |
| Norway | NO |
| Oman | MU |
| Pakistan | PK |
| Palau | PS |
| Palmyra Atoll | LQ |
| Panama | PM |
| Papua New Guinea | PP |
| Paracel Islands | PF |
| Paraguay | PA |
| Peru | PE |
| Philippines | RP |
| Pitcairn Island | PC |
| Poland | PL |
| Portugal | PO |
| Qatar | QA |
| Reunion | RE |
| Romania | RO |
| Russia | RS |
| Rwanda | RW |
| St Barthelemy | TB |
| St Helena | SH |
| St Kitts and Nevis | SC |
| St Lucia | ST |
| St Martin | RN |
| St Pierre and Miquelon | SB |
| St Vincent and the Grenadines | VC |
| Samoa | WS |
| San Marino | SM |
| Sao Tome and Principe | TP |
| Saudi Arabia | SA |
| Scotland | UK |
| Senegal | SG |
| Serbia | RI |
| Seychelles | SE |
| Sierra Leone | SL |
| Singapore | SN |
| Sint Maarten | NN |
| Slovakia | LO |
| Slovenia | SI |
| Solomon Islands | BP |
| Somalia | SO |
| South Africa | SF |
| South Georgia and South Sandwich Islands | SX |
| South Sudan | OD |
| Spain | SP |
| Spratly Islands | PG |
| Sri Lanka | CE |
| Sudan | SU |
| Suriname | NS |
| Svalbard | SV |
| Swaziland | WZ |
| Sweden | SW |
| Switzerland | SZ |
| Syria | SY |
| Taiwan | TW |
| Tajikistan | TI |
| Tanzania, United Republic of | TZ |
| Thailand | TH |
| Timor-Leste | TT |
| Togo | TO |
| Tokelau | TL |
| Tonga | TN |
| Trinidad and Tobago | TD |
| Tromelin Island | TE |
| Tunisia | TS |
| Turkey | TU |
| Turkmenistan | TX |
| Turks and Caicos Islands | TK |
| Tuvalu | TV |
| Uganda | UG |
| Ukraine | UP |
| United Arab Emirates | AE |
| United Kingdom | UK |
| Uruguay | UY |
| Uzbekistan | UZ |
| Vanuatu | NH |
| Vatican City | VT |
| Venezuela | VE |
| Vietnam | VM |
| Virgin Islands (British) | VI |
| Wake Island | WQ |
| Wales | UK |
| Wallis and Futuna | WF |
| West Bank | WE |
| Western Sahara | WI |
| Yemen | YM |
| Zambia | ZA |
| Zimbabwe | ZI |
Other Countries
| OC
|