Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '136.18.19.0'
+220
ERRNo PTR record availible DNS server 'z.arin.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.19.18.136.in-addr.arpa'.