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Country code top-level domain

A country code top-level domain ( ccTLD ) is an [Internet] [top-level domain] generally used or reserved for a [country] (a sovereign state or a [dependent territory] ).

All ccTLD identifiers are two letters long, and all two-letter top-level domains are ccTLDs. Creation and delegation of ccTLDs is performed by the [Internet Assigned Numbers Authority] (IANA)
as described in RFC 1591, corresponding to [ISO 3166-1] [alpha-2] [country codes] with few exceptions explained below.

Delegation and management
The IANA (currently contracted to [ICANN] ) is responsible for determining an appropriate trustee for each ccTLD. Administration and control is then delegated to that trustee, which is responsible for the policies and operation of the domain. The current delegation can be determined from [IANA's list of ccTLDs] . Individual ccTLDs may have varying requirements and fees for registering [subdomains] . There may be a local presence requirement (for instance, citizenship or other connection to the ccTLD), as for example the [Canadian] ( [ca] ) and [German] ( [de] ) domains, or registration may be open.

Relation to ISO 3166-1
Unused ISO 3166-1 codes
Almost all current ISO 3166-1 codes have been assigned and do exist in DNS.
However, some of these are effectively unused. In particular, the ccTLDs for the Norwegian dependency [Bouvet Island] ( [bv] ) and the designation [Svalbard and Jan Mayen] ( [sj] ) do exist in DNS, but no subdomains have been assigned, and it is [Norid] policy not to assign any at present. Two [French] territories, [bl] ( [Saint Barthélemy] ) and [mf] ( [Saint Martin] ), await local assignment by France's government.

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