whois(1) on FreeBSD
The text 571990c5506b, as FreeBSD 11.0-RELEASE shipped it.
Internet domain name and network number directory service
Flags it lists
-
-A -
-I -
-P -
-Q -
-R -
-S -
-a -
-b -
-c -
-f -
-g -
-h -
-i -
-k -
-l -
-m -
-p -
-r