Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '144.220.37.0'
+117
ERRNo PTR record availible DNS server 'x3.amazonaws.org' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.37.220.144.in-addr.arpa'.