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.co is the Internet country code top-level domain assigned to Colombia.. It is administered by .CO Internet S.A.S., [4] a subsidiary of Neustar since 2014. As of July 10, 2010, there were no registration restrictions on second-level .co domains; any individual or entity in the world can register a .co domain.
A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code. All ASCII ccTLD identifiers are two letters long, and all two-letter top-level domains are ccTLDs.
In a number of countries, .co (an abbreviation of commercial) is used as a second-level domain in the Domain Name System used to route internet traffic. Domain registrants register second-level domains of the form .co.xx, where xx is the country code top level domain (e.g., .co.uk in the U.K. and .co.jp in Japan).
The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted. See the ISO 3166-3 standard for former country codes.
.co (second-level domain), the Internet second-level domain meaning "commercial".co, the Internet country code top-level domain (ccTLD) for Colombia; Commitment ordering (CO), a concurrency control technique for databases; Telephone exchange, or central office (CO)
They are the most widely used of the country codes published by ISO (the others being alpha-3 and numeric), and are used most prominently for the Internet's country code top-level domains (with a few exceptions). They are also used as country identifiers extending the postal code when appropriate within the international postal system for paper ...
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 .
The postal abbreviation is the same as the ISO 3166-2 subdivision code for each of the fifty states. These codes do not overlap with the 13 Canadian subnational postal abbreviations . The code for Nebraska changed from NB to NE in November 1969 to avoid a conflict with New Brunswick. [ 4 ]