Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '23.249.215.0'
+111
ERRNo PTR record availible DNS server 'x3.amazonaws.org' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.215.249.23.in-addr.arpa'.