Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '23.141.168.0'
+228
ERRNo PTR record availible DNS server 'r.arin.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.168.141.23.in-addr.arpa'.