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ISO 3166-1 alpha-2 – two-letter country codes which are also used to create the ISO 3166-2 country subdivision codes and the Internet country code top-level domains. 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.
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.
It defines three sets of country codes: [1] ISO 3166-1 alpha-2 – two-letter country codes which are used most prominently for the Internet's country code top-level domains (with a few exceptions). ISO 3166-1 alpha-3 – three-letter country codes which allow a better visual association between the codes and the country names than the alpha-2 ...
The following alpha-2 codes can be user-assigned: AA, QM to QZ, XA to XZ, and ZZ. [21] For example: The International Standard Recording Code (ISRC) uses QM as a second country code for the United States, as it ran out of three-character registrant codes within the US prefix. It also uses ZZ for some registrants assigned directly. [22]
ISO 3166-1 alpha-2: two-letter code; ISO 3166-1 alpha-3: three-letter code; ISO 3166-1 numeric: three-digit code; The two-letter codes are used as the basis for other codes and applications, for example, for ISO 4217 currency codes; with deviations, for country code top-level domain names (ccTLDs) on the Internet: list of Internet TLDs.
This is a listing of lists of country codes: List of ISO country codes (ISO 3166) ITU country code (International Telecommunication Union) List of country calling codes E.164; Mobile country code E.212; Maritime identification digits; List of ITU letter codes (radiocommunication division) UIC country code (International Union of Railways) List ...
Highlighted rows indicate those entries in which the three-letter codes differ from column to column. The last column indicates the number of codes present followed by letters to indicate which codes are present (O for Olympic, F for FIFA, and I for ISO) and dashes when a code is absent; capital letters indicate codes which match; lower case ...
Two-letter country codes are used to represent countries and states (often both widely recognized and not) as a code of two letters. ISO 3166-1 alpha-2 is the main set of two-letter country codes that is currently used. This standard set of codes is a part of ISO 3166-1, also maintains a list of three-letter codes for countries (ISO 3166-1 ...