Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '219.121.160.0'
+788
ERRNo PTR record availible DNS server 'dns0.hi-ho.ne.jp' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.160.121.219.in-addr.arpa'.