Second-level domain

From Biocrawler, the free encyclopedia.

In the Domain Name System (DNS) hierarchy, a second-level domain is a domain that is directly below a top-level domain (TLD). For example, in www.district125.k12.il.us, il is the second-level domain of the us TLD.

Second-level domains commonly refer to the organization that registered the domain name with a domain name registrar or ccTLD registrar. Some TLDs introduce a second-level hierarchy that indicates the type of organization registered under it. For example, in the .uk TLD a college or other academic institution would register under .ac.uk, while companies would register under .co.uk.

See also

• Top-level domain
• Subdomain
• Country code top-level domain
• Single-letter second-level domains

Wikipedia (http://en.wikipedia.org/wiki/Main_Page) Second-level_domain (http://en.wikipedia.org/wiki/Second-level_domain) version history (http://en.wikipedia.org/w/index.php?title=Second-level_domain&action=history) GNU Free Documentation Lizenz (http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License) CC-by-sa (http://creativecommons.org/licenses/by-sa/2.5/)

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