We pick a.root-servers.net, one of the 13 root servers (1), and ask it about upcoming.org and learn that org is delegated to six name servers (2), so we ask b2.org.afilias-nst.org where we learn that upcoming.org is delegated to four name servers, including ns3.yahoo.com (3), so we ask that one and get the following answer:
Upcoming.org is a domain controlled by four domain name servers at yahoo.com. All four of them are on different IP networks. Incoming mail for upcoming.org is handled by four mail servers also at yahoo.com. Some of them are on the same IP network. Upcoming.org has two IP numbers (68.180.206.184, 98.139.102.145). Both are on different IP networks.
The two IP numbers 68.180.206.184 and 98.139.102.145 together
There are several thousand of host names that point to the two IP numbers 68.180.206.184 and 98.139.102.145 together, hereafter referred to as "IP group 1".
Most of them use the five name servers ns1, ns2, ns3, ns4 and ns5.yahoo.com together, hereafter referred to as "name server group 1", (example: moyahoo.com, yohool.com and yahoobst.net ). Worth noting is that two thirds of the domains that use name server group 1 point to IP group 1.
The IP number 98.139.102.145
There are several thousand of host names that point to the IP number 98.139.102.145.