Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2001:300::'
+347
ERRNo PTR record availible DNS server 'dns0.iij.ad.jp' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.1.0.0.2.ip6.arpa'.