A domain name ending in .au signifies that the person or organisation using it has a connection to Australia.

com.au

For commercial entities, such as companies (with an ABN or ACN as registered through ASIC), and businesses (registered with state governments).

net.au

For commercial entities, such as companies (with an ABN/ACN as registered through ASIC), and businesses (registered with state governments).

org.au

For charities and non-profit organisations.

.au

.au direct names – e.g. auda.au –  are open to anyone with a connection to Australia.

ans.au

For incorporated associations, political parties, trade unions, sporting and special interest clubs.

id.au

For individuals who are Australian citizens or residents.