dns2tcpc(1) on Linux
The text 76ff661e6724, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
A tunneling tool that encapsulate TCP traffic over DNS.
Flags it lists
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-c -
-e -
-h -
-k -
-l -
-r