Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2001:4f8:11::'
+287
ERRNo PTR record availible DNS server 'ns1.isc.org' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.1.0.0.8.f.4.0.1.0.0.2.ip6.arpa'.