Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '74.247.224.0'
+338
ERRNo PTR record availible DNS server 'ns10b.attdns.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.224.247.74.in-addr.arpa'.