Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '8.3.72.0'
+116
ERRNo PTR record availible DNS server 'ns1.level3.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.72.3.8.in-addr.arpa'.