Carrier Connect uses the official format specifications for postal codes in the respective countries. The officially permitted formats are then converted, if necessary, into the formats expected by the carrier in order to determine routing results, service checks, and follow-up processes.
The following formats are required for the respective countries:
| Country | ISO code | Format (Z: Letter; 9: Number; not specified: postal code can be empty) |
| Afghanistan | AF | 9999 |
| Egypt | EG | 99999 |
| Aland | AX | not specified |
| Albania | AL | 9999 |
| Algeria | DZ | 99999 |
| United States Virgin Islands | VI | 99999-9999 |
| American Samoa | AS | ZZ 99999 |
| Andorra | AD | AD999 |
| Angola | AO | not specified |
| Anguilla | AI | not specified |
| Antarctica | AQ | not specified |
| Antigua and Barbuda | AG | not specified |
| Equatorial Guinea | GQ | not specified |
| Argentina | AR | Z9999ZZZ |
| Armenia | AM | 9999 |
| Aruba | AW | not specified |
| Azerbaijan | AZ | ZZ 9999 or ZZ9999 |
| Ethiopia | ET | 9999 |
| Australia | AU | 9999 |
| Bahamas | BS | not specified |
| Bahrain | BH | 999 or 9999 |
| Peoples Rep. of Bangladesh | BD | 9999 |
| Barbados | BB | BB99999 |
| Belarus | BY | 999999 |
| Belgium | BE | 9999 |
| Belize | BZ | not specified |
| Benin | BJ | not specified |
| Bermuda | BM | ZZ 99 |
| Occupied Palestinian Territory | PS | not specified |
| Bhutan | BT | not specified |
| Venezuela | VE | 9999 |
| Bonaire, Saint Eustatius, Saba | BQ | not specified |
| Bosnia and Herzegovina | BA | 99999 |
| Botswana | BW | not specified |
| Bouvet Island | BV | not specified |
| Brazil | BR | 99999-999 |
| British Indian Ocean Territory | IO | Z9 9ZZ Z99 9ZZ ZZ9 9ZZ ZZ99 9ZZ Z9Z 9ZZ ZZ9Z 9ZZ |
| British Virgin Islands | VG | ZZ9999 |
| Brunei Darussalam | BN | ZZ9999 |
| Bulgara | BG | 9999 |
| Burkina Faso | BF | 99 or not specified |
| Burundi | BI | not specified |
| Ceuta | XC | not specified |
| Chile | CL | 999-9999 or 9999999 |
| Cook Islands | CK | 9999 |
| Costa Rica | CR | 99999 |
| Curacao | CW | not specified |
| Denmark | DK | 9999 |
| Dem. People's Rep. of Korea | KP | not specified |
| Democratic Republic Congo | CD | not specified |
| Federal Rep. of Germany | DE | 99999 |
| Dominica | DM | not specified |
| Dominican Republic | DO | 99999 |
| Dschibuti | DJ | not specified |
| Ecuador | EC | 999999 |
| El Salvador | SV | 9999 |
| Ivory Coast | CI | not specified |
| Eritrea | ER | not specified |
| Estonia | EE | 99999 |
| European Union | EU | not specified |
| Falkland Islands | FK | ZZZZ 9ZZ |
| Faröer | FO | ZZ999 |
| Republic of Fiji | FJ | not specified |
| Finland | FI | 99999 |
| Federated States of Micronesia | FM | ZZ 99999 |
| France | FR | 99999 |
| French Polynesia | PF | 99999 |
| French Southern Territories | TF | 99999 |
| French-Guayana | GF | 99999 |
| Gabon | GA | not specified |
| Gambia | GM | not specified |
| Georgien | GE | 9999 |
| Ghana | GH | not specified |
| Gibraltar | GI | not specified |
| Grenada | GD | not specified |
| Greece | GR | (999 99)|(99999) |
| Greenland | GL | 9999 |
| Guadeloupe | GP | 99999 |
| Guam | GU | ZZ 99999 or 99999 |
| Guatemala | GT | 99999 |
| Guernsey | GG | not specified |
| Guinea | GN | not specified |
| Guinea-Bissau | GW | 9999 |
| Guyana | GY | not specified |
| Haiti | HT | ZZ9999 |
| Heard Is. & McDonald Islands | HM | 9999 |
| Vatican City | VA | 99999 |
| High Seas | QP | not specified |
| Honduras | HN | ZZ9999 or ZZ99999 |
| Hong Kong, China | HK | not specified |
| India | IN | 999999 |
| Indonesia | ID | 99999 |
| Iraq | IQ | 99999 |
| Iran | IR | 9999999999 |
| Ireland | IE | not specified |
| Iceland | IS | 999 |
| Isle of Man | IM | not specified |
| Israel | IL | 99999 or 9999999 |
| Italia | IT | 99999 |
| Jamaica | JM | not specified |
| Japan | JP | 999-9999 |
| Jersey | JE | not specified |
| Jordan | JO | 99999 |
| Cayman Islands | KY | ZZ9-9999 |
| Cambodia | KH | (99999)|(999999) |
| Cameroon | CM | not specified |
| Canada | CA | Z9Z 9Z9 |
| Cape Verde | CV | 9999 |
| Kazakhstan | KZ | 999999 |
| Quatar | QA | not specified |
| Kenya | KE | 99999 |
| Kyrgyzstan | KG | 999999 |
| Republic of Kiribati | KI | not specified |
| US Minor Outlying Islands | UM | 99999-9999 |
| Cocos Islands | CC | 9999 |
| Colombia | CO | 999999 |
| Comoros | KM | not specified |
| Congo | CG | not specified |
| Kosovo | XK | not specified |
| Croatia | HR | 99999 or HR99999 or HR-99999 |
| Cuba | CU | 99999 |
| Kuwait | KW | 99999 |
| Laos | LA | 99999 |
| Lesotho | LS | 999 |
| Latvia | LV | LV-9999 or 9999 |
| Lebanon | LB | 9999 9999 |
| Liberia | LR | 9999 |
| Libya | LY | not specified |
| Liechtenstein | LI | 9999 |
| Lithuania | LT | LT-99999 or 99999 |
| Luxembourg | LU | 9999 |
| Macau, China | MO | not specified |
| Madagascar | MG | 999 |
| Malawi | MW | not specified |
| Malaysia | MY | 99999 |
| Republic of Maldives | MV | 99999 |
| Mali | ML | not specified |
| Malta | MT | ZZZ 9999 |
| Marocco | MA | 99999 |
| Marshall Islands | MH | ZZ99999 |
| Martinique | MQ | 99999 |
| Mauretania | MR | not specified |
| Mauritius | MU | not specified |
| Mayotte | YT | 99999 |
| Melilla | XL | not specified |
| Mexico | MX | 99999 |
| Monaco | MC | not specified |
| Mongolian People's Republic | MN | 99999 |
| Montenegro | ME | 99999 |
| Montserrat | MS | not specified |
| Mozambique | MZ | 9999 |
| Union of Myanmar | MM | 99999 |
| Republic of Naur | NR | not specified |
| Kingdom of Nepal | NP | 99999 |
| New Caledonia | NC | 99999 |
| New Zealand | NZ | 9999 |
| Nicaragua | NI | 999-999-9 or 99999 |
| The Netherlands | NL | 9999 ZZ or 9999ZZ |
| Niger | NE | 9999 |
| Fereral Republic of Nigeria | NG | 999999 |
| Niue | NU | 9999 |
| Northern Mariana Islands | MP | ZZ99999 |
| The F.Y.R. of Macedonia | MK | 9999 |
| Norfolk Island | NF | 9999 |
| Norway | NO | 9999 |
| Sultanate of Oman | OM | 999 |
| Austria | AT | 9999 |
| Pakistan | PK | 99999 |
| Palau | PW | ZZ99999 |
| Panama | PA | not specified |
| Papua-Neuguinea | PG | 999 |
| Paraguay | PY | 9999 |
| Peru | PE | 99999 |
| Philippinen | PH | 9999 |
| Pitcairn Islands | PN | ZZZZ 9ZZ |
| Bolivia | BO | not specified |
| Poland | PL | 99-999 |
| Portugal | PT | 9999-999 |
| Puerto Rico | PR | 99999 or PR99999 |
| Réunion | RE | 99999 |
| Republic of Yemen | YE | not specified |
| Republic of Korea | KR | 999-999 or 99999 |
| Republic of Moldova | MD | MD-9999 or 9999 |
| Republic of Namibia | NA | not specified |
| Republik of South Africa | ZA | 9999 |
| Ruanda | RW | not specified |
| Romania | RO | 999999 |
| Russian Federation | RU | 999999 |
| State of Solomon Islands | SB | not specified |
| Zambia | ZM | 99999 |
| Samoa | WS | not specified |
| San Marino | SM | 99999 |
| São Tomé & Príncipe | ST | not specified |
| Saudi-Arabia | SA | 99999 |
| Sweden | SE | 999 99 or ZZ-999 99 |
| Switzerland | CH | 9999 |
| Senegal | SN | 99999 |
| Serbia | RS | 99999 |
| Serbia and Montenegro | CS | not specified |
| Seychelles | SC | not specified |
| Sierra Leone | SL | not specified |
| Zimbabwe | ZW | not specified |
| Republic of Singapore | SG | 999999 |
| Slovak Republic | SK | 999 99 |
| Slowenia | SI | SI-9999 or 9999 |
| Somalia | SO | not specified |
| Spain | ES | 99999 |
| Spitsbergen and Jan Mayen | SJ | not specified |
| Dem.Soc.Rep. of Sri Lanka | LK | 99999 |
| St. Barthélemy | BL | 99999 |
| St. Helena | SH | ZZZZ 9ZZ |
| St. Kitts und Nevis | KN | not specified |
| St. Lucia | LC | not specified |
| Sint Maarten | SX | 99999 |
| St. Pierre and Miquelon | PM | 99999 |
| St. Vincent & the Grenadines | VC | not specified |
| Sudan | SD | 99999 |
| S. Georgia & S. Sandwich Islands | GS | ZZZZ 9ZZ |
| South Sudan | SS | not specified |
| Suriname | SR | not specified |
| Swaziland | SZ | Z999 |
| Syrian Arab Republic | SY | not specified |
| Tajikistan | TJ | 999999 |
| Taiwan | TW | 999 or 999 99 or 99999 or 999 999 or 999999 |
| United Republic of Tanzania | TZ | not specified |
| Kingdom of Thailand | TH | 99999 |
| Timor-Leste | TL | not specified |
| Togo | TG | not specified |
| Tokelau | TK | 9999 |
| Tonga | TO | not specified |
| Trinidad ans Tobago | TT | not specified |
| Tschad | TD | not specified |
| Czech Republic | CZ | 999 99 |
| Tunisia | TN | 9999 |
| Turkey | TR | 99999 |
| Turkmenistan | TM | 999999 |
| Turks and Caicos Islands | TC | ZZZZ 9ZZ |
| Tuvalu | TV | not specified |
| Uganda | UG | not specified |
| Ukraine | UA | 99999 |
| Hungary | HU | 9999 |
| Uruguay | UY | 99999 |
| Uzbekistan | UZ | 999999 |
| Vanuatu | VU | not specified |
| Vereinigte Arabische Emirate | AE | not specified |
| United States Of America | US | 99999 |
| United Kingdom | GB | Z9 9ZZ Z99 9ZZ ZZ9 9ZZ ZZ99 9ZZ Z9Z 9ZZ ZZ9Z 9ZZ |
| Vietnam | VN | 999999 |
| People's Republic of China | CN | 999999 |
| Wallis and Futuna Islands | WF | 99999 |
| Christmas Island | CX | 9999 |
| Western Sahara | EH | not specified |
| Central African Republic | CF | not specified |
| Cyprus | CY | 9999 |
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