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Second-level domain

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, example is the second-level domain of the .com 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 [ccSLD] , while companies would register under

See also
- [Country code second-level domain]
- [Single-letter second-level domains]
- [Domain Name System]
- [Top-level domain]
- [Country code top-level domain]
- [Subdomain] (including "third-level domain" etcetera)

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