216.73.217.121
-- unable to reverse lookup 216.73.217.121: lookup 121.217.73.216.in-addr.arpa. on [fd:43::a]:53: server misbehaving

### Whois
[Querying whois.iana.org:43 '216.73.217.121']
[Querying whois.iana.org:43 'domain 216.73.217.121']
[whois.iana.org]
% IANA WHOIS server
% for more information on IANA, visit http://www.iana.org
%
% Error: Invalid query domain 216.73.217.121