| Country | Zone | ISO2 | ISO3 | Continent |
| Afghanistan | 2 | AF | AFG | Asia |
| Åland Islands | 3 | AX | ALA | Europe |
| Albania | 1 | AL | ALB | Europe |
| Algeria | 2 | DZ | DZA | Africa |
| American Samoa | 3 | AS | ASM | Australasia |
| Andorra | 3 | AD | AND | Europe |
| Angola | 3 | AO | AGO | Africa |
| Anguilla | 3 | AI | AIA | North America |
| Antigua and Barbuda | 3 | AG | ATG | North America |
| Argentina | 2 | AR | ARG | South America |
| Armenia | 2 | AM | ARM | Europe |
| Aruba | 3 | AW | ABW | South America |
| Australia | 1 | AU | AUS | Australasia |
| Austria | 1 | AT | AUT | Europe |
| Azerbaijan | 2 | AZ | AZE | Europe |
| Bahamas | 3 | BS | BHS | North America |
| Bahrain | 2 | BH | BHR | Asia |
| Bangladesh | 2 | BD | BGD | Asia |
| Barbados | 3 | BB | BRB | North America |
| Belarus | 1 | BY | BLR | Europe |
| Belgium | 1 | BE | BEL | Europe |
| Belize | 3 | BZ | BLZ | South America |
| Benin | 2 | BJ | BEN | Africa |
| Bermuda | 3 | BM | BMU | North America |
| Bhutan | 3 | BT | BTN | Asia |
| Bolivia | 3 | BO | BOL | South America |
| Bonaire, Sint Eustatius and Saba | 3 | BQ | BES | South America |
| Bosnia and Herzegovina | 1 | BA | BIH | Europe |
| Botswana | 3 | BW | BWA | Africa |
| Bouvet Island | 3 | BV | BVT | Europe |
| Brazil | 2 | BR | BRA | South America |
| British Indian Ocean Territory | 3 | IO | IOT | Australasia |
| Brunei Darussalam | 3 | BN | BRN | Asia |
| Bulgaria | 1 | BG | BGR | Europe |
| Burkina Faso | 2 | BF | BFA | Africa |
| Burundi | 3 | BI | BDI | Africa |
| Cabo Verde | 3 | CV | CPV | Europe |
| Cambodia | 2 | KH | KHM | Africa |
| Cameroon | 3 | CM | CMR | Africa |
| Canada | 1 | CA | CAN | North America |
| Cayman Islands | 3 | KY | CYM | North America |
| Central African Republic | 3 | CF | CAF | Africa |
| Chad | 3 | TD | TCD | Africa |
| Chile | 2 | CL | CHL | South America |
| China | 2 | CN | CHN | Asia |
| Christmas Island | 3 | CX | CXR | Australasia |
| Cocos (Keeling) Islands | 3 | CC | CCK | Australasia |
| Colombia | 2 | CO | COL | South America |
| Comoros | 3 | KM | COM | Africa |
| Congo | 3 | CG | COG | Africa |
| Cook Islands | 3 | CK | COK | Australasia |
| Costa Rica | 3 | CR | CRI | South America |
| Côte d'Ivoire | 3 | CI | CIV | Africa |
| Croatia | 1 | HR | HRV | Europe |
| Cuba | 3 | CU | CUB | South America |
| Curaçao | 3 | CW | CUW | Australasia |
| Cyprus | 3 | CY | CYP | Europe |
| Czechia | 2 | CZ | CZE | Europe |
| Democratic Republic of the Congo | 3 | CD | COD | Africa |
| Denmark | 1 | DK | DNK | Europe |
| Djibouti | 3 | DJ | DJI | Africa |
| Dominica | 3 | DM | DMA | South America |
| Dominican Republic | 3 | DO | DOM | South America |
| Ecuador | 2 | EC | ECU | South America |
| Egypt | 2 | EG | EGY | Africa |
| El Salvador | 3 | SV | SLV | South America |
| Equatorial Guinea | 3 | GQ | GNQ | Africa |
| Eritrea | 3 | ER | ERI | Africa |
| Estonia | 1 | EE | EST | Europe |
| Ethiopia | 3 | ET | ETH | Africa |
| Falkland Islands [Malvinas] | 3 | FK | FLK | South America |
| Faroe Islands | 3 | FO | FRO | Europe |
| Fiji | 3 | FJ | FJI | Australasia |
| Finland | 1 | FI | FIN | Europe |
| France | 1 | FR | FRA | Europe |
| French Guiana | 3 | GF | GUF | Africa |
| French Polynesia | 3 | PF | PYF | Asia |
| French Southern Territories | 3 | TF | ATF | Asia |
| Gabon | 3 | GA | GAB | Africa |
| Gambia | 3 | GM | GMB | Africa |
| Georgia | 2 | GE | GEO | Europe |
| Germany | 1 | DE | DEU | Europe |
| Ghana | 3 | GH | GHA | Africa |
| Gibraltar | 3 | GI | GIB | Europe |
| Greece | 1 | GR | GRC | Europe |
| Greenland | 2 | GL | GRL | Europe |
| Grenada | 3 | GD | GRD | South America |
| Guadeloupe | 3 | GP | GLP | South America |
| Guam | 3 | GU | GUM | Australasia |
| Guatemala | 3 | GT | GTM | South America |
| Guernsey | 3 | GG | GGY | Europe |
| Guinea | 3 | GN | GIN | Africa |
| Guinea-Bissau | 3 | GW | GNB | Africa |
| Guyana | 3 | GY | GUY | South America |
| Haiti | 3 | HT | HTI | South America |
| Heard Island and McDonald Islands | 3 | HM | HMD | Australasia |
| Holy See | 3 | VA | VAT | Europe |
| Honduras | 3 | HN | HND | South America |
| Hong Kong | 2 | HK | HKG | Asia |
| Hungary | 1 | HU | HUN | Europe |
| Iceland | 1 | IS | ISL | Europe |
| India | 2 | IN | IND | Asia |
| Indonesia | 2 | ID | IDN | Asia |
| Iran | 2 | IR | IRN | Asia |
| Iraq | 2 | IQ | IRQ | Asia |
| Ireland | 1 | IE | IRL | Europe |
| Isle of Man | 3 | IM | IMN | Europe |
| Israel | 3 | IL | ISR | Europe |
| Italy | 1 | IT | ITA | Europe |
| Jamaica | 3 | JM | JAM | North America |
| Japan | 2 | JP | JPN | Asia |
| Jersey | 3 | JE | JEY | Europe |
| Jordan | 2 | JO | JOR | Asia |
| Kazakhstan | 2 | KZ | KAZ | Asia |
| Kenya | 3 | KE | KEN | Africa |
| Kiribati | 3 | KI | KIR | Australasia |
| Kosovo | 1 | XK | XKX | Europe |
| Kuwait | 2 | KW | KWT | Asia |
| Kyrgyzstan | 2 | KG | KGZ | Asia |
| Lao People's Democratic Republic | 2 | LA | LAO | Asia |
| Latvia | 1 | LV | LVA | Europe |
| Lebanon | 2 | LB | LBN | Asia |
| Lesotho | 3 | LS | LSO | Africa |
| Liberia | 3 | LR | LBR | Africa |
| Libya | 2 | LY | LBY | Africa |
| Liechtenstein | 1 | LI | LIE | Europe |
| Lithuania | 1 | LT | LTU | Europe |
| Luxembourg | 1 | LU | LUX | Europe |
| Macao | 3 | MO | MAC | Asia |
| Madagascar | 3 | MG | MDG | Africa |
| Malawi | 3 | MW | MWI | Africa |
| Malaysia | 2 | MY | MYS | Asia |
| Maldives | 3 | MV | MDV | Asia |
| Mali | 3 | ML | MLI | Africa |
| Malta | 1 | MT | MLT | Europe |
| Marshall Islands | 3 | MH | MHL | Australasia |
| Martinique | 3 | MQ | MTQ | South America |
| Mauritania | 3 | MR | MRT | Africa |
| Mauritius | 3 | MU | MUS | Asia |
| Mayotte | 3 | YT | MYT | Africa |
| Mexico | 2 | MX | MEX | North America |
| Micronesia (Federated States of Micronesia) | 3 | FM | FSM | Asia |
| Moldova | 1 | MD | MDA | Europe |
| Monaco | 3 | MC | MCO | Europe |
| Mongolia | 3 | MN | MNG | Asia |
| Montenegro | 1 | ME | MNE | Europe |
| Montserrat | 3 | MS | MSR | North America |
| Morocco | 3 | MA | MAR | Africa |
| Mozambique | 3 | MZ | MOZ | Africa |
| Myanmar | 2 | MM | MMR | Asia |
| Namibia | 3 | NA | NAM | Africa |
| Nauru | 3 | NR | NRU | Australasia |
| Nepal | 2 | NP | NPL | Asia |
| Netherlands | 1 | NL | NLD | Europe |
| New Caledonia | 3 | NC | NCL | Australasia |
| New Zealand | 2 | NZ | NZL | Australasia |
| Nicaragua | 3 | NI | NIC | South America |
| Niger | 3 | NE | NER | Africa |
| Nigeria | 3 | NG | NGA | Africa |
| Niue | 3 | NU | NIU | Australasia |
| Norfolk Island | 3 | NF | NFK | Australasia |
| North Korea (Democratic People's Republic of Korea) | 3 | KP | PRK | Asia |
| North Macedonia | 1 | MK | MKD | Europe |
| Northern Mariana Islands | 3 | MP | MNP | Asia |
| Norway | 1 | NO | NOR | Europe |
| Oman | 2 | OM | OMN | Asia |
| Pakistan | 2 | PK | PAK | Asia |
| Palau | 3 | PW | PLW | Australasia |
| Palestine, State of | 2 | PS | PSE | Asia |
| Panama | 3 | PA | PAN | South America |
| Papua New Guinea | 3 | PG | PNG | Asia |
| Paraguay | 3 | PY | PRY | South America |
| Peru | 3 | PE | PER | South America |
| Philippines | 3 | PH | PHL | Asia |
| Pitcairn | 3 | PN | PCN | Asia |
| Poland | 1 | PL | POL | Europe |
| Portugal | 1 | PT | PRT | Europe |
| Puerto Rico | 3 | PR | PRI | South America |
| Qatar | 2 | QA | QAT | Asia |
| Réunion | 3 | RE | REU | Africa |
| Romania | 1 | RO | ROU | Europe |
| Russian Federation | 1 | RU | RUS | Europe |
| Rwanda | 3 | RW | RWA | Africa |
| Saint Barthélemy | 3 | BL | BLM | South America |
| Saint Helena, Ascension and Tristan da Cunha | 3 | SH | SHN | Africa |
| Saint Kitts and Nevis | 3 | KN | KNA | North America |
| Saint Lucia | 3 | LC | LCA | North America |
| Saint Martin (French part) | 3 | MF | MAF | South America |
| Saint Pierre and Miquelon | 3 | PM | SPM | South America |
| Saint Vincent and the Grenadines | 3 | VC | VCT | North America |
| Samoa | 3 | WS | WSM | Australasia |
| San Marino | 3 | SM | SMR | Europe |
| Sao Tome and Principe | 3 | ST | STP | Africa |
| Saudi Arabia | 2 | SA | SAU | Asia |
| Senegal | 3 | SN | SEN | Africa |
| Serbia | 3 | RS | SRB | Europe |
| Seychelles | 3 | SC | SYC | Asia |
| Sierra Leone | 3 | SL | SLE | Africa |
| Singapore | 2 | SG | SGP | Asia |
| Sint Maarten (Dutch part) | 3 | SX | SXM | South America |
| Slovakia | 1 | SK | SVK | Europe |
| Slovenia | 1 | SI | SVN | Europe |
| Solomon Islands | 3 | SB | SLB | Australasia |
| Somalia | 3 | SO | SOM | Africa |
| South Africa | 3 | ZA | ZAF | Africa |
| South Georgia and the South Sandwich Islands | 3 | GS | SGS | South America |
| South Korea (Republic of Korea) | 2 | KR | KOR | Asia |
| South Sudan | 3 | SS | SSD | Africa |
| Spain | 1 | ES | ESP | Europe |
| Sri Lanka | 2 | LK | LKA | Asia |
| Sudan | 2 | SD | SDN | Africa |
| Suriname | 3 | SR | SUR | South America |
| Svalbard and Jan Mayen | 3 | SJ | SJM | Europe |
| Swaziland | 3 | SZ | SWZ | Africa |
| Sweden | 1 | SE | SWE | Europe |
| Switzerland | 1 | CH | CHE | Europe |
| Syrian Arab Republic | 2 | SY | SYR | Asia |
| Taiwan | 2 | TW | TWN | Asia |
| Tajikistan | 2 | TJ | TJK | Asia |
| Tanzania, United Republic of Tanzania | 3 | TZ | TZA | Africa |
| Thailand | 2 | TH | THA | Asia |
| Timor-Leste | 3 | TL | TLS | Asia |
| Togo | 3 | TG | TGO | Africa |
| Tokelau | 3 | TK | TKL | Australasia |
| Tonga | 3 | TO | TON | Australasia |
| Trinidad and Tobago | 3 | TT | TTO | North America |
| Tunisia | 2 | TN | TUN | Africa |
| Turkey | 2 | TR | TUR | Europe |
| Turkmenistan | 2 | TM | TKM | Asia |
| Turks and Caicos Islands | 3 | TC | TCA | South America |
| Tuvalu | 3 | TV | TUV | Australasia |
| Uganda | 3 | UG | UGA | Africa |
| Ukraine | 1 | UA | UKR | Europe |
| United Arab Emirates | 2 | AE | ARE | Asia |
| United Kingdom | 98 | GB | GBR | Europe |
| United States Minor Outlying Islands | 3 | UM | UMI | North America |
| United States of America | 1 | US | USA | North America |
| Uruguay | 3 | UY | URY | South America |
| Uzbekistan | 2 | UZ | UZB | Asia |
| Vanuatu | 3 | VU | VUT | Africa |
| Venezuela (Bolivarian Republic of Venezuela) | 2 | VE | VEN | South America |
| Vietnam | 2 | VN | VNM | Asia |
| Virgin Islands (British) | 3 | VG | VGB | North America |
| Virgin Islands (U.S.) | 1 | VI | VIR | North America |
| Wallis and Futuna | 3 | WF | WLF | Australasia |
| Western Sahara | 2 | EH | ESH | Africa |
| Yemen | 2 | YE | YEM | Asia |
| Zambia | 3 | ZM | ZMB | Africa |
| Zimbabwe | 3 | ZW | ZWE | Africa |