krb5_set_default_realm(3) on Linux
The text 22cf95533184, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it. The page shows this text now.
default and host realm read and manipulation routines