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A top-level domain (TLD) is the last part of a domain name, such as .com, .net, .org.

TLDs for web development

Many developers use a TLD for local domains for development. .dev is often used for this, but was registered in 2015 by Google [1]. In 2017, Google enabled HSTS for all .dev domains [2] meaning it will not allow to work over HTTP any more.

RFC 2606 explicitly reserves .test, .example, and .invalid [3]. There is a draft specification for .localhost.

Database of available TLDs

The IANA manages the authoritative list of TLDs on their website: the Root Zone Database. Every domain has its own Delegation Record that is linked to and can be checked. If you would like to know who owns .cat you can check its Delegation Record.

See Also