Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '3.172.3.0'
+432
ERRNo PTR record availible DNS server 'x3.amazonaws.org' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.3.172.3.in-addr.arpa'.