mactelnetd(1) on Linux
The text 9d2c466336f5, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
Telnet daemon for MAC-address connections
Flags it lists
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-h -
-n -
-v