We pick m.root-servers.net, one of the 13 root servers (1), and ask it about 3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.e.0.0.c.7.6.0.1.0.0.2.ip6.arpa and learn that ip6.arpa is delegated to six name servers (2), so we ask b.ip6-servers.arpa where we learn that 6.0.1.0.0.2.ip6.arpa is delegated to six name servers, including sns-pb.isc.org (3), so we ask that one and get the following answer:
Authoritative answer
ANSWER for 3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.e.0.0.c.7.6.0.1.0.0.2.ip6.arpa.