We pick h.root-servers.net, one of the 13 root servers (1), and ask it about co.id and learn that id is delegated to four name servers (2), so we ask ns1.indo.net.id where we learn that co.id is delegated to eight name servers, including c.dns.id (3), so we ask that one and get the following answer:
Co.id is a domain controlled by eight domain name servers at ns1.id, net.id and dns.id having a total of eleven IP numbers. All eleven of them are on different IP networks.
Ten of the 13 domains that use the name server g.dns.id use the seven name servers a, b, c, d, e, f and g.dns.id together (example: sch.id, or.id and desa.id ).
The name server ns1.id
There are about twenty domains that use the name server ns1.id.