Country code second-level domain

A country code second-level domain is a second-level domain to a country code top-level domain.[citation needed] Such a domain may be reserved by a domain name registry for the registration of third-level domains, or assigned to a third party as a subdomain.

Many country code domain registries implement domain name classes at the second level underneath their ccTLD, such as are present in the original generic top-level domains com, net, and org, which were intended for commercial entities, network operators, and non-profit organizations, respectively.

Many countries implement additional classes. For example, the United Kingdom (.uk) uses co.uk for commercial purposes and ac.uk for academic registrants. Brazil (.br) has a high number of predefined second-level domains, 140 as of 2021; they range from com.br for commercial activities and vet.br for veterinarians to wiki.br for wikis (see .br ยง Second-level domains).[1]


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