https://www.theregister.com/2024/08/08/dot_internal_ratified/
Vint Cerf revealed Google already uses the string, as do plenty of others
The Internet Corporation for Assigned Names and Numbers (ICANN) has agreed to reserve the .internal top-level domain so it can become the equivalent to using the 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 IPv4 address blocks for internal networks.
Those blocks are reserved for private use by the Internet Assigned Numbers Authority, which requires they never appear on the public internet…
