We pick m.root-servers.net, one of the 13 root servers (1), and ask it about 63.196.in-addr.arpa and learn that in-addr.arpa is delegated to six name servers (2), so we ask c.in-addr-servers.arpa where we learn that 196.in-addr.arpa is delegated to seven name servers, including ns2.lacnic.net (3), so we ask that one and get the following answer: