Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2a05:d000:6000::'
+398
ERRNo PTR record availible DNS server 'pdns1.ultradns.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.6.0.0.0.d.5.0.a.2.ip6.arpa'.