Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '72.20.140.0'
+191
ERRNo PTR record availible DNS server 'ns1.pslightwave.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.140.20.72.in-addr.arpa'.