Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '198.44.181.0'
+306
ERRNo PTR record availible DNS server 'arin.authdns.ripe.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.181.44.198.in-addr.arpa'.