ldns-testns(1) on Linux
The text bdd29701c2b4, 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.
simple fake nameserver tool
Flags it lists
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-6 -
-f -
-p -
-r -
-v