stone(1) on Linux
The text 2239d9efc74d, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it. The page shows this text now.
a simple TCP/IP packet repeater
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-d -
-f -
-l -
-n -
-u -
-z