Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2001:1620::'
+1.410
ERRNo PTR record availible DNS server 'ns2.init7.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.6.1.1.0.0.2.ip6.arpa'.