ns1.audns.net.au has one IP number , which also has a corresponding reverse pointer. au, sa.au, nt.au, id.au, wa.au and at least 40 other hosts use this as a nameserver. audns.net.au is a domain controlled by nine nameservers. All of them are on different IP networks. Incoming mail for audns.net.au is handled by two mailservers at auda.org.au. They are on different IP networks. ns1.audns.net.au is hosted on a server in Australia.