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