unbound-host(1) on Linux
The text 661d5cff44a3, as Debian 10 (Buster) shipped it.
unbound DNS lookup utility
Flags it lists
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-4 -
-6 -
-C -
-D -
-F -
-c -
-d -
-f -
-h -
-r -
-t -
-v -
-y