Unable to find any PTR-records for the specified domain/ip :(
Log
+001
Resolving PTR record of '2804:8f8::'
+413
ERRNo PTR record availible DNS server 'AUTH25.NS.GIN.NTT.NET' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.f.8.0.4.0.8.2.ip6.arpa'.