ndp(8) on macOS
The text 8cf3cfa9c2b3, as Mac OS X 10.7.5, Mac OS X 10.7.4, Mac OS X 10.7.3, Mac OS X 10.7.2, Mac OS X 10.7.1, Mac OS X 10.7 shipped it.
control/diagnose IPv6 neighbor discovery protocol
Flags it lists
-
-A -
-H -
-P -
-R -
-a -
-c -
-d -
-f -
-l -
-n -
-p -
-r -
-s -
-t