Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '72.1.32.0'
+219
ERRNo PTR record availible DNS server 'ns1.tierra.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.32.1.72.in-addr.arpa'.