Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '74.172.240.0'
+237
ERRNo PTR record availible DNS server 'ns10a.attdns.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.240.172.74.in-addr.arpa'.