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Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
The alphabetic country codes were first included in ISO 3166 in 1974, and the numeric country codes were first included in 1981. The country codes have been published as ISO 3166-1 since 1997, when ISO 3166 was expanded into three parts, with ISO 3166-2 defining codes for subdivisions and ISO 3166-3 defining codes for former countries. [1] As a ...
ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes. ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division, with the advantage of script ...
The United Nations uses a combination of ISO 3166-1 alpha-2 and alpha-3 codes, along with codes that pre-date the creation of ISO 3166, for international vehicle registration codes, which are codes used to identify the issuing country of a vehicle registration plate; some of these codes are currently indeterminately reserved in ISO 3166-1.
The FIPS standard includes both the codes for independent countries (similar but often incompatible with the ISO 3166-1 alpha-2 standard) and the codes for top-level subdivision of the countries (similar to but usually incompatible with the ISO 3166-2 standard). The ISO 3166 codes are used by the United Nations and for Internet top-level ...
ISO 3166-2:RE is the entry for Réunion in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1. Currently no ISO 3166-2 codes are defined in the entry for ...
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International Civil Aviation Organization: XR1 Region 1 (RR 5.3) XR2 Region 2 (RR 5.4) XR3 Region 3 (RR 5.5) XRY Antarctic Region (RR AP 26/5.2) XSC ex SCG Serbia and Montenegro: XSD ex Republic of the Sudan before 14 July 2011 → SDN + SSD XSP Spratly Islands: XSU ex URS Soviet Union → RUS + … XUN United Nations: XWB West Bank: XWM