Unable to find any PTR-records for the specified domain/ip :(
Log
+000
Resolving PTR record of '2c0f:ef78:3::'
+365
ERRNo PTR record availible DNS server 'd.ns.facebook.com' raised an NotExistentDomain error, while beeing queried for PTR-records on domain '0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0.8.7.f.e.f.0.c.2.ip6.arpa'.