Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2a01:8840:12::'
+353
ERRNo PTR record availible DNS server 'ns1.hkg1.afilias-nst.info' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.1.0.0.0.4.8.8.1.0.a.2.ip6.arpa'.