Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '202.251.0.0'
+777
ERRNo PTR record availible DNS server 'dns-b.iij.ad.jp' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.251.202.in-addr.arpa'.