Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2a06:5901:8100::'
+313
ERRNo PTR record availible DNS server 'ns1.isp.sky.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.8.1.0.9.5.6.0.a.2.ip6.arpa'.