We pick m.root-servers.net, one of the 13 root servers (1), and ask it about yahhoo.fr and learn that fr is delegated to five name servers (2), so we ask g.ext.nic.fr where we learn that yahhoo.fr is delegated to five name servers, including ns3.yahoo.com (3), so we ask that one and get the following answer:
Yahhoo.fr is a domain controlled by five domain name servers at yahoo.com. All five of them are on different IP networks. Incoming mail for yahhoo.fr is handled by one mail server also at yahoo.com. We are missing the IP:s of one server: nomail.yahoo.com.
