We pick d.root-servers.net, one of the 13 root servers (1), and ask it about domain.vn and learn that vn is delegated to seven name servers (2), so we ask vn.cctld.authdns.ripe.net where we learn that domain.vn is delegated to three name servers, including dns2.vnnic.vn (3), so we ask that one and get the following answer:
Domain.vn is a domain controlled by three domain name servers at vnnic.vn having a total of five IP numbers. Two of them are on the same IP network. Domain.vn has one IP number (203.119.8.85), but the reverse is tenmientiengviet.vn.
The three name servers dns1, dns2 and dns3.vnnic.vn together
Three of the about twenty domains that use name server group 1 point to the three IP numbers 2001:dc8:0:2::83, 2001:dc8:0:2::84 and 203.119.8.85 together, hereafter referred to as "IP group 1". Worth noting is that three of the host names that point to IP group 1 use name server group 1.
