We pick m.root-servers.net, one of the 13 root servers (1), and ask it about j.bb9.fr and learn that fr is delegated to five name servers (2), so we ask g.ext.nic.fr where we learn that bb9.fr is delegated to two name servers, including m.bb9.fr (3), so we ask that one and get the following answer:
J.bb9.fr is a domain controlled by two domain name servers at bb9.fr. Both are on the same IP network. Incoming mail for j.bb9.fr is handled by two mail servers also at bb9.fr. Both are on the same IP network. J.bb9.fr has one IP number (78.242.115.26), which is the same as for bb9.fr. J.bb9.fr also has a corresponding reverse pointer.
J.bb9.fr is hosted on a server in Lexy, B2, France.
The name server m.bb9.fr
All of the about twenty domains that use the name server m.bb9.fr use the two name servers j and m.bb9.fr together, hereafter referred to as "name server group 1".
The mail server mxm.bb9.fr
All of the about twenty domains that use the mail server mxm.bb9.fr use the two mail servers mxj and mxm.bb9.fr together.
The IP number 78.242.115.26
All of the seven host names that point to the IP number 78.242.115.26 point only to that ip number.
The two name servers j and m.bb9.fr together
Three quarter of the about twenty domains that use name server group 1 point only to the IP number 78.242.115.163.
