We pick g.root-servers.net, one of the 13 root servers (1), and ask it about belfiore.fr and learn that fr is delegated to five name servers (2), so we ask g.ext.nic.fr where we learn that belfiore.fr is delegated to two name servers, including ns1.amen.fr (3), so we ask that one and get the following answer:
Belfiore.fr is a domain controlled by two domain name servers at amen.fr. Both are on the same IP network. Incoming mail for belfiore.fr is handled by two mail servers at google.com and belfiore.fr having a total of 22 IP numbers. There are five duplicated IP numbers. Some of them are on the same IP network. Belfiore.fr has one IP number (81.88.57.68), but the reverse is ?.
The two name servers ns2 and paris.amen.fr together
About one in six of the several thousand of domains that use name server group 2 point only to the IP number 81.88.48.95 (example: kaophonictribu.com and eec-fr.com ).