Sep 14, 2018

Reserved DNS names

Reserved DNS names

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

In addition, RFC 6762 reserves the use of .local for link-local host names that can be resolved via the Multicast DNS name resolution protocol.

Example.com, example.net, example.org, and example.edu are second-level domain names reserved for documentation purposes and examples of the use of domain names.