Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '220.208.192.0'
+1.000
ERRNo PTR record availible DNS server 'dns1.hi-ho.ne.jp' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.192.208.220.in-addr.arpa'.