ns3.aarnet.net.au has one IP number , which also has a corresponding reverse pointer. csiro.au, vpac.org, ntu.edu.au, ecu.edu.au, pfc.org.au and at least 90 other hosts use this as a nameserver. aarnet.net.au is a domain controlled by three nameservers at aarnet.net.au themselves. All of them are on the same IP network. Incoming mail for aarnet.net.au is handled by two mailservers having a total of five IP numbers. There are five duplicated IP numbers. Some of them are on the same IP network. aarnet.net.au has one IP number. ns3.aarnet.net.au is hosted on a server in Australia.