We pick j.root-servers.net, one of the 13 root servers (1), and ask it about gogle.org and learn that org is delegated to six name servers (2), so we ask a0.org.afilias-nst.info where we learn that gogle.org is delegated to two name servers, including ns2.sedoparking.com (3), so we ask that one and get the following answer:
Gogle.org is a domain controlled by two domain name servers at sedoparking.com having a total of six IP numbers. Two of them are on the same IP network. Gogle.org has one IP number (82.98.86.169).
All of the millions of domains that use the primary name server ns1.sedoparking.com use name server group 1 (example: rotten.biz, kupv.com and waragai.com ). Worth noting is that a third of the domains that use name server group 1 use the primary name server ns1.sedoparking.com.
The two name servers ns1 and ns2.sedoparking.com together
There are millions of domains that use name server group 1.