Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '198.212.50.0'
+147
ERRNo PTR record availible DNS server 'pdns71.ultradns.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.50.212.198.in-addr.arpa'.