From Wikipedia, the free encyclopedia
|In the Domain Name
System (DNS) hierarchy, a subdomain is a domain that
is part of a larger domain. For example, "example.com" is a subdomain
of the "com" top-level domain (TLD) while "www.example.com"
is a subdomain in the domain "example.com". In fact,
the "com" TLD is a subdomain of the root domain,
".". This hierarchical organisation is similar to that in a
filesystem; something is a subdomain if it could be equated to a
folder, and a record within that subdomain to a file. Note,
though, that DNS names are written in descending hierarchy
right-to-left, where filesystems are written left-to-right.
Relative to a subdomain, the larger domain that it is a part of is its parent domain, or alternately superdomain (the former term appears to be preferred by the IETF).
Note that "subdomain" expresses relative dependence, not absolute dependence: for example, wikipedia.org comprises a subdomain of the org domain, and en.wikipedia.org comprises a subdomain of the domain wikipedia.org. In theory, this subdivision can go down to 127 levels deep, and each DNS label can contain up to 63 characters, as long as the whole domain name does not exceed a total length of 255 characters. But in practice some domain registries have shorter limits than that.
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