Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '81.90.143.0'
+240
ERRNo PTR record availible DNS server 'ns-52.awsdns-06.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.143.90.81.in-addr.arpa'.