DNS delegation of a.zxy.jp updated: Jun 18, 2013 10:39:06 PM
Delegation
step
query
auth
servers
1
a.zxy.jp.
.
(g,j,c,m,h,d,e,i,l,b,f,k,a).root-servers.net.
2
a.zxy.jp.
jp.
(e,g,b,a,d,c,f).dns.jp.
3
a.zxy.jp.
zxy.jp.
(ns).zxy.jp.
4
a.zxy.jp.
a.zxy.jp.
(ns1,ns2).a.zxy.jp.
We pick g.root-servers.net, one of the 13 root servers (1), and ask it about a.zxy.jp and learn that jp is delegated to seven name servers (2), so we ask e.dns.jp where we learn that zxy.jp is delegated to one name server, including ns.zxy.jp (3), so we ask that one and learn that a.zxy.jp is delegated to two name servers (4), so we ask ns1.a.zxy.jp and get the following answer:
All of the three domains that use the name server ns1.a.zxy.jp use the two name servers ns1 and ns2.a.zxy.jp together, hereafter referred to as "name server group 1".
The name server ns2.a.zxy.jp
All of the three domains that use the name server ns2.a.zxy.jp use name server group 1.
The IP number 115.187.64.10
All of the two host names that point to the IP number 115.187.64.10 point only to that ip number (example: ns2.i.zxy.jp ).
The IP number 115.187.64.2
All of the two host names that point to the IP number 115.187.64.2 point only to that ip number (example: ns1.i.zxy.jp ).