nsd(8) on OpenBSD
The text ad6792cd6b8f, as OpenBSD 6.9 shipped it.
Name Server Daemon (NSD) version 4.3.6.
Flags it lists
-
-4 -
-6 -
-I -
-N -
-P -
-V -
-a -
-c -
-d -
-f -
-h -
-i -
-l -
-n -
-p -
-s -
-t -
-u -
-v