Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '81.18.192.0'
+436
ERRNo PTR record availible DNS server 'ns1.upc.biz' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.192.18.81.in-addr.arpa'.