Or .internal if you do setup your own DNS servers.
.internal is reserved by ICANN, but there is no IETF RFC ('just' a draft (for now)):
* https://en.wikipedia.org/wiki/Top-level_domain#Reserved_doma...
* https://en.wikipedia.org/wiki/Special-use_domain_name
* https://en.wikipedia.org/wiki/.internal
* https://datatracker.ietf.org/doc/html/draft-davies-internal-...
Not sure how important that is.
alt Hacker News
.internal is reserved by ICANN, but there is no IETF RFC ('just' a draft (for now)):
* https://en.wikipedia.org/wiki/Top-level_domain#Reserved_doma...
* https://en.wikipedia.org/wiki/Special-use_domain_name
* https://en.wikipedia.org/wiki/.internal
* https://datatracker.ietf.org/doc/html/draft-davies-internal-...
Not sure how important that is.