Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '210.128.0.0'
+512
ERRNo PTR record availible DNS server 'dns-b.iij.ad.jp' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.128.210.in-addr.arpa'.