Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2001:240::'
+697
ERRNo PTR record availible DNS server 'ns7.iij.ad.jp' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.2.0.1.0.0.2.ip6.arpa'.