Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '23.154.104.0'
+135
ERRNo PTR record availible DNS server 'z.arin.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.104.154.23.in-addr.arpa'.