ns1.optus.net.au has one IP number , which also has a corresponding reverse pointer. ns2.console.com.au cnames to this hostname. ns1.optus.com.au and dns0.optus.net.au point to the same IP. mincom.com, oktedi.com, mbf.com.au, ing.com.au, ac3.edu.au and at least 100 other hosts use this as a nameserver. optus.net.au is delegated to two nameservers, however one delegated nameserver is missing in the zone and one other nameserver is listed instead. All nameservers are at optus.net.au themselves. Two nameservers have the same IP number. They are on the same IP network. Incoming mail for optus.net.au is handled by four mailservers at optus.com.au. Some of them are on the same IP network. optus.net.au has one IP number. ns1.optus.net.au is hosted on a server in Australia.