We pick k.root-servers.net, one of the 13 root servers (1), and ask it about yahoo.cn and learn that cn is delegated to six name servers (2), so we ask ns.cernet.net where we learn that yahoo.cn is delegated to two name servers, including ns8.yahoo.com (3), so we ask that one and get the following answer:
There are six host names that point to the IP number 202.165.102.205.
All of those point only to that ip number (example: .yahoo.com.cn ).
Four of them use the two name servers ns8 and ns9.yahoo.com together, hereafter referred to as "name server group 1".
The two name servers ns8 and ns9.yahoo.com together
There are four domains that use name server group 1.
All of those point only to the IP number 202.165.102.205. Worth noting is that four of the host names that point only to the IP number 202.165.102.205 use name server group 1.
Two of them use only the mail server mx1.mail.cnb.yahoo.com. Worth noting is that all of the domains that only use the mail server mx1.mail.cnb.yahoo.com use name server group 1.
The name server ns8.yahoo.com
There are nine domains that use the name server ns8.yahoo.com.
Four of the six host names that point only to the IP number 202.165.102.205 use name server group 1. Worth noting is that all of the domains that use name server group 1 point only to the IP number 202.165.102.205.
The 14 name servers ns8.yahoo.com, dns.hinet.net, 168.95.1.1, 61.64.127.1, 168.95.192.1, 61.64.127.2…
All of those use name server group 1. Worth noting is that two of the domains that use name server group 1 use only the mail server mx1.mail.cnb.yahoo.com.
