unbound-host(1) on Linux
The text b50769d32a53, as Debian 9 (Stretch) shipped it.
unbound DNS lookup utility
Flags it lists
-
-4 -
-6 -
-C -
-D -
-F -
-c -
-d -
-f -
-h -
-r -
-t -
-v -
-y