nc(1) on macOS
The text af65b383908b, as Mac OS X 10.8.5, Mac OS X 10.8.4, Mac OS X 10.8.3, Mac OS X 10.8.2, Mac OS X 10.8.1, Mac OS X 10.8 shipped it.
arbitrary TCP and UDP connections and listens
Flags it lists
-
-4 -
-6 -
-A -
-C -
-D -
-U -
-X -
-b -
-c -
-d -
-h -
-i -
-k -
-l -
-n -
-p -
-r -
-s -
-t -
-u -
-v -
-w -
-z