Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2620:121:5071::'
+167
ERRNo PTR record availible DNS server 'r.arin.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.7.0.5.1.2.1.0.0.2.6.2.ip6.arpa'.