DNS delegation of sina100.com updated: May 26, 2013 3:58:18 AM
Delegation
step
query
auth
servers
1
sina100.com.
.
(i,g,c,l,h,f,e,b,m,d,k,j,a).root-servers.net.
2
sina100.com.
com.
(m,g,h,f,b,j,k,l,e,i,d,a,c).gtld-servers.net.
3
sina100.com.
sina100.com.
(ns3,ns1,ns2).sina.com.cn.
We pick i.root-servers.net, one of the 13 root servers (1), and ask it about sina100.com and learn that com is delegated to 13 name servers (2), so we ask m.gtld-servers.net where we learn that sina100.com is delegated to three name servers, including ns3.sina.com.cn (3), so we ask that one and get the following answer:
Sina100.com is a domain controlled by three domain name servers at sina.com.cn. All three of them are on different IP networks. Incoming mail for sina100.com is handled by one mail server at sina100.com themselves.
There are about seventy domains that use the primary name server ns1.sina.com.cn.
Half of those use name server group 1 (example: sinahk.net, sinaimg.com.cn and weibo.com.cn ). Worth noting is that three quarter of the domains that use name server group 1 use the primary name server ns1.sina.com.cn.
One quarter of them use the four name servers ns1, ns2, ns3 and ns4.sina.com.cn together, hereafter referred to as "name server group 2", (example: weibo.com, kandian.com and twgame.com.cn ). Worth noting is that most of the domains that use name server group 2 use the primary name server ns1.sina.com.cn.
The six name servers ns1.sina.com, ns2.sina.com, ns1.sina.com.cn, ns2.sina.com.cn, ns3.sina.com.cn a…
