Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '99.83.80.0'
+768
ERRNo PTR record availible DNS server 'x3.amazonaws.org' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.80.83.99.in-addr.arpa'.