RFC 8375: Special-Use Domain 'home.arpa.' is supposed to be used for this.
It would be awesome if Ubiquity will actually follow this RFC too. The Amplifi product line from Ubiquity have `.lan` support but no `home.arpa`.
[0]: https://amplifi.com/
RFCs were originally formalization of what was being used in practice, home.arpa was chosen apparently for reasons of beauracratic convenience rather than what would best serve existing users, who all would prefer .lan and continue to do so since that was published in 2018
That's nice and all, but OpenWrt (and its use of .lan) predates this particular RFC by a rough 14 years.
I hope the gTLD application gets struck down.
But what if my LAN is in the garage?
Internal. is also an valid option. I moved everything there about a year ago
and most people dont use it because its an incredibly poor name.