Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '68.131.0.0'
+135
ERRNo PTR record availible DNS server 'ns6.verizon.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.131.68.in-addr.arpa'.