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Second-level domain

Domaining Guide

Second-level domain

Home | Up | Single-letter second-level domains


In the Domain Name System (DNS) hierarchy, a second-level domain (SLD) is a domain that is directly below a top-level domain (TLD). For example, in wikipedia.org, wikipedia is the second-level domain of the .org TLD.

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

See also


Home | Up | Top-level domain | Country code top-level domain | Generic top-level domain | Sponsored top-level domain | List of Internet top-level domains | Proposed top-level domain | Pseudo top-level domain | Second-level domain

Domaining Guide, made by MultiMedia | Websites for sale

This guide is licensed under the GNU Free Documentation License. It uses material from the Wikipedia.


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