dummy_server(8) on Linux
The text 36dd0a91f3d0, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it. The page shows this text now.
A simple server that binds to a user-specified port and does nothing