dnssec-verify(8) on macOS
The text 64e4df294b5c, as macOS 10.13.3, macOS 10.13.2, macOS 10.13.1, macOS 10.13 shipped it.
DNSSEC zone verification tool
Flags it lists
-
-I -
-V -
-c -
-o -
-v -
-x -
-z