zserv(8) on Linux
The text 9a6656d157c1, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it. The page shows this text now.
CERNLIB server program for transferring ZEBRA formatted files