Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2406:da68:8000::'
+330
ERRNo PTR record availible DNS server 'x4.amazonaws.org' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.8.6.a.d.6.0.4.2.ip6.arpa'.