Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '54.240.216.0'
+139
ERRNo PTR record availible DNS server 'x1.amazonaws.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.216.240.54.in-addr.arpa'.