Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2600:9000:1e42::'
+287
ERRNo PTR record availible DNS server 'pdns1.ultradns.net' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.4.e.1.0.0.0.9.0.0.6.2.ip6.arpa'.