We pick d.root-servers.net, one of the 13 root servers (1), and ask it about sohu.com.cn and learn that cn is delegated to six name servers (2), so we ask ns.cernet.net where we learn that sohu.com.cn is delegated to three name servers, including dns.sohu.com (3), so we ask that one and get the following answer:
Three of them use the four name servers dns, ns1, ns2 and ns4.sohu.com together, hereafter referred to as "name server group 2", (example: sohu.com and sohu.org ).
The IP number 61.135.181.176
There are about sixty host names that point to the IP number 61.135.181.176.
The three name servers dns, ns1 and ns2.sohu.com together
Eight of the 15 domains that use name server group 1 point to IP group 1. Worth noting is that eight of the host names that point to IP group 1 use name server group 1.
The two IP numbers 61.135.181.175 and 61.135.181.176 together
There are about fifty host names that point to IP group 1.
Eight of those use name server group 1. Worth noting is that eight of the domains that use name server group 1 point to IP group 1.
Three of them use name server group 2. Worth noting is that all of the domains that use name server group 2 point to IP group 1.
The four name servers dns, ns1, ns2 and ns4.sohu.com together
All of the three domains that use name server group 2 point to IP group 1. Worth noting is that three of the host names that point to IP group 1 use name server group 2.
