Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2606:f4c0:6180::'
+250
ERRNo PTR record availible DNS server 'u.arin.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.1.6.0.c.4.f.6.0.6.2.ip6.arpa'.