Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '91.225.226.0'
+291
ERRNo PTR record availible DNS server 'pri.authdns.ripe.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.226.225.91.in-addr.arpa'.