Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '144.220.39.0'
+207
ERRNo PTR record availible DNS server 'x2.amazonaws.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.39.220.144.in-addr.arpa'.