distrib.pats(5) on Linux
The text 98ad6ad0ba47, as Debian 13 (Trixie), Debian 10 (Buster), Debian 5.0 (Lenny), Debian 3.1 (Sarge), Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo) shipped it.
default values for Usenet Distribution header