Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '81.52.188.0'
+473
ERRNo PTR record availible DNS server 'ns6.oleane.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.188.52.81.in-addr.arpa'.