[oftenwrong]

IANA also reserves TLDs like '.test' and '.example' as well as some IDN equivalents.

https://www.rfc-editor.org/rfc/rfc2606.html

https://www.iana.org/domains/reserved

[colmmacc]

There are also documentation and example IP prefixes! 192.0.2.0/24 and 2001:db8::/32.

[santiagobasulto]

And .local, right?

[lioeters]

Actually, no. According to RFC 2606 - Reserved Top Level DNS Names, the following four domain names are reserved:

  .test
  .example
  .invalid
  .localhost