Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '18.34.72.0'
+312
ERRNo PTR record availible DNS server 'z.arin.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.72.34.18.in-addr.arpa'.