Network - Top Level Domain (Tld) - Suffix

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1 - About

Top Level Domain are the domain at the highest level in the hierarchical Domain Name System of the internet network.

As a domain name is a hierarchy of name separated by a point, it is the last part of the fully qualified domain name.

It's also known as the public suffix (one under which Internet users can (or historically could) directly register names.
Some examples of public suffixes are .com, .co.uk

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3 - Example

in the domain name www.example.com, the top-level domain is com.

4 - List

5 - Reserved top-level domains

RFC 6761 reserves the following four top-level domain names to avoid confusion and conflict. Any such reserved usage of those TLDs should not occur in production networks that utilize the global domain name system:

  • example: reserved for use in examples
  • invalid: reserved for use in obviously invalid domain names
  • localhost: reserved to avoid conflict with the traditional use of localhost as a hostname
  • test: reserved for use in tests

6 - Documentation / Reference