arp(8) on macOS
The text d4e454c62e50, 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.
address resolution display and control
Flags it lists
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-a -
-d -
-f -
-i -
-l -
-n