Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '216.52.17.0'
+222
ERRNo PTR record availible DNS server 'ns-b.pnap.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.17.52.216.in-addr.arpa'.