python-cymruwhois(1) on Linux
The text 50a481320c19, as Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.
program to lookup ip addresses using the cymru whois service
Flags it lists
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--cache -
--delim -
--fields -
--help -
--no-cache -
-c -
-d -
-f -
-h -
-n