Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '121.200.200.0'
+093
ERRNo PTR record availible DNS server 'apnic.authdns.ripe.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.200.200.121.in-addr.arpa'.