We pick j.root-servers.net, one of the 13 root servers (1), and ask it about hotmail.com.my and learn that my is delegated to seven name servers (2), so we ask ns5.jaring.my where we learn that com.my is delegated to five name servers, including ns5.jaring.my (3), so we ask that one and learn that hotmail.com.my is delegated to three name servers (4), so we ask ns2.msft.net and get the following answer:
Hotmail.com.my is a domain controlled by five domain name servers at msft.net having a total of ten IP numbers. Some of them are on the same IP network. Incoming mail for hotmail.com.my is handled by four mail servers at hotmail.com having a total of twelve IP numbers. There are 36 duplicated IP numbers. All twelve of them are on the same IP network. Hotmail.com.my has four IP numbers (65.55.143.16, 65.55.143.17, 65.55.129.173, 65.55.129.171). All four of them are on the same IP network.
The four IP numbers 65.55.129.171, 65.55.129.173, 65.55.143.16 and 65.55.143.17 together
Four of the eight host names that point to IP group 1 use the three name servers ns2, ns3 and ns4.msft.net together (but neither ns1 nor ns5.msft.net ).
The four mail servers mx1, mx2, mx3 and mx4.hotmail.com together
There are more than two hundred domains that use mail server group 1.
