| AD Andorra | CY Cyprus | IO British Indian Ocean Territory | NA Namibia | SY Syria |
| AE United Arab Emirates | CZ Czech Republic | IR Iran | NC New Caledonia | SZ Swaziland |
| AF Afghanistan | DE Germany | IS Iceland | NE Niger | TC Turks and Caicos Islands |
| AG Antigua and Barbuda | DJ Djibouti | IT Italy | NF Norfolk Island | TD Chad |
| AI Anguilla | DK Denmark | JM Jamaica | NG Nigeria | TF French Southern Territories |
| AL Albania | DM Dominica | JO Jordan | NI Nicaragua | TG Togo |
| AM Armenia | DO Dominican Republic | JP Japan | NL Netherlands | TH Thailand |
| AN Netherlands Antilles | DZ Algeria | KE Kenya | NO Norway | TJ Tajikistan |
| AO Angola | EC Ecuador | KG Kyrgyzstan | NP Nepal | TK Tokelau |
| AQ Antarctica | EE Estonia | KH Cambodia | NR Nauru | TM Turkmenistan |
| AS American Samoa | EG Egypt | KI Kiribati | NT Neutral Zone | TN Tunisia |
| AT Austria | EH Western Sahara | KM Comoros | NU Niue | TO Tonga |
| AU Australia | ER Eritrea | KN Saint Kitts and Nevis | NZ New Zealand (Aotearoa) | TP East Timor |
| AW Aruba | ES Spain | KP Korea (North) | OM Oman | TR Turkey |
| AZ Azerbaijan | ET Ethiopia | KR Korea (South) | PA Panama | TT Trinidad and Tobago |
| BA Bosnia and Herzegovina | FI Finland | KW Kuwait | PE Peru | TV Tuvalu |
| BB Barbados | FJ Fiji | KY Cayman Islands | PF French Polynesia | TW Taiwan |
| BD Bangladesh | FK Falkland Islands (Malvinas) | KZ Kazakhstan | PG Papua New Guinea | TZ Tanzania |
| BE Belgium | FM Micronesia | LA Laos | PH Philippines | UA Ukraine |
| BF Burkina Faso | FO Faroe Islands | LB Lebanon | PK Pakistan | UG Uganda |
| BG Bulgaria | FR France | LC Saint Lucia | PL Poland | UK United Kingdom |
| BH Bahrain | FX France, Metropolitan | LI Liechtenstein | PM St. Pierre and Miquelon | UM US Minor Outlying Islands |
| BI Burundi | GA Gabon | LK Sri Lanka | PN Pitcairn | US United States |
| BJ Benin | GB Great Britain (UK) | LR Liberia | PR Puerto Rico | UY Uruguay |
| BM Bermuda | GD Grenada | LS Lesotho | PT Portugal | UZ Uzbekistan |
| BN Brunei Darussalam | GE Georgia | LT Lithuania | PW Palau | VA Vatican City State (Holy See) |
| BO Bolivia | GF French Guiana | LU Luxembourg | PY Paraguay | VC Saint Vincent and the Grenadines |
| BR Brazil | GH Ghana | LV Latvia | QA Qatar | VE Venezuela |
| BS Bahamas | GI Gibraltar | LY Libya | RE Reunion | VG Virgin Islands (British) |
| BT Bhutan | GL Greenland | MA Morocco | RO Romania | VI Virgin Islands (U.S.) |
| BV Bouvet Island | GM Gambia | MC Monaco | RU Russian Federation | VN Vietnam |
| BW Botswana | GN Guinea | MD Moldova | RW Rwanda | VU Vanuatu |
| BY Belarus | GP Guadeloupe | MG Madagascar | SA Saudi Arabia | WF Wallis and Futuna Islands |
| BZ Belize | GQ Equatorial Guinea | MH Marshall Islands | SB Solomon Islands | WS Samoa |
| CA Canada | GR Greece | MK Macedonia | SC Seychelles | YE Yemen |
| CC Cocos (Keeling) Islands | GS S. Georgia and S. Sandwich Isls. | ML Mali | SD Sudan | YT Mayotte |
| CF Central African Republic | GT Guatemala | MM Myanmar | SE Sweden | YU Yugoslavia |
| CG Congo | GU Guam | MN Mongolia | SG Singapore | ZA South Africa |
| CH Switzerland | GW Guinea-Bissau | MO Macau | SH St. Helena | ZM Zambia |
| CI Cote D'Ivoire (Ivory Coast) | GY Guyana | MP Northern Mariana Islands | SI Slovenia | ZR Zaire |
| CK Cook Islands | HK Hong Kong | MQ Martinique | SJ Svalbard and Jan Mayen Islands | ZW Zimbabwe |
| CL Chile | HM Heard and McDonald Islands | MR Mauritania | SK Slovak Republic | COM US Commercial |
| CM Cameroon | HN Honduras | MS Montserrat | SL Sierra Leone | EDU US Educational |
| CN China | HR Croatia (Hrvatska) | MT Malta | SM San Marino | GOV US Government |
| CO Colombia | HT Haiti | MU Mauritius | SN Senegal | INT International |
| CR Costa Rica | HU Hungary | MV Maldives | SO Somalia | MIL US Military |
| CS Czechoslovakia (former) | ID Indonesia | MW Malawi | SR Suriname | NET Network |
| CU Cuba | IE Ireland | MX Mexico | ST Sao Tome and Principe | ORG Non-Profit Organization |
| CV Cape Verde | IL Israel | MY Malaysia | SU USSR (former) | ARPA Old style Arpanet |
| CX Christmas Island | IN India | MZ Mozambique | SV El Salvador | NATO Nato field |