Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '72.90.128.0'
+216
ERRNo PTR record availible DNS server 'ns5.verizon.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.128.90.72.in-addr.arpa'.