Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '23.231.84.0'
+365
ERRNo PTR record availible DNS server 'rdns1.serverhubdns.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.84.231.23.in-addr.arpa'.