Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '72.151.16.0'
+354
ERRNo PTR record availible DNS server 'ns10b.attdns.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.16.151.72.in-addr.arpa'.