Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '91.227.75.0'
+610
ERRNo PTR record availible DNS server 'rirns.arin.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.75.227.91.in-addr.arpa'.