Some common uses of ISO country codes include international mail, as top-level domain names e. ISO — Codes for the representation of names of countries and their subdivisions — Part 1: Country code sets the country codes. It establishes for each country an alphabetic 2-character alpha-2 code, an alphabetic 3-character alpha-3 code, and a three-digit numeric numeric-3 code. This document is intended for use in any application requiring the expression of current country names in coded form.
Please note that ISO does not define the names of countries. ISO — Codes for the representation of names of countries and their subdivisions — Part 2: Country subdivision code compiles codes for representing the names of principal administrative divisions of countries and territories included in ISO The numeric country code is assigned by the UN.
As a general rule, the ISO Maintenance Agency does not assign official country code elements to other geopolitical areas or countries that are not member states of the UN.
To be considered, some criteria, amongst others, include that the area be physically separated from its parent country and outside its territorial waters. Even if all criteria are met, the ISO Maintenance Agency may decide not to assign a code element, for example, due to the very limited number of official alpha-2 code elements available.
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