nsd(8) on Linux
The text 6803fbdfcb04, as Debian 11 (Bullseye) shipped it.
Name Server Daemon (NSD) version 4.3.5.
Flags it lists
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-4 -
-6 -
-I -
-N -
-P -
-V -
-a -
-c -
-d -
-f -
-h -
-i -
-l -
-n -
-p -
-s -
-t -
-u -
-v