Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '91.198.117.0'
+226
ERRNo PTR record availible DNS server 'ns-659.awsdns-18.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.117.198.91.in-addr.arpa'.