We pick m.root-servers.net, one of the 13 root servers (1), and ask it about hkirc.net.hk and learn that hk is delegated to ten name servers (2), so we ask z.hkirc.net.hk where we learn that hkirc.net.hk is delegated to six name servers, including z.hkirc.net.hk (3), so we ask that one and get the following answer:
Hkirc.net.hk is a domain controlled by six domain name servers at hkdnr.hk, hkirc.net.hk and pch.net having a total of ten IP numbers. Some of them are on the same IP network. Incoming mail for hkirc.net.hk is handled by one mail server at hkirc.hk having a total of two IP numbers. Both are on the same IP network.
Most of the several hundred of domains that use the name server ns6.hkirc.net.hk use the two name servers ns5 and ns6.hkirc.net.hk together, hereafter referred to as "name server group 1", (example: 0u.hk, 12.hk and 2222.hk ).