The registry holds the database of domain names and operates the computers that make domain names visible on the Internet. The registry does not have direct contact with registrants. The registry for com.au, net.au, org.au, asn.au, edu.au, gov.au and id.au is AusRegistry.
Registrars issue domain name licences to registrants. They decide whether or not your domain name application meets the policy rules. Registrars have direct access to the registry so that they can process new registrations and renewals, as well as update registrant contact details in the database. Registrars in the .au domain space are accredited and licensed by auDA.
Resellers are businesses that provide domain name registration services to the public but are not accredited registrars. Resellers buy .au domain names and manage domain name records for their customers through an interface with an accredited .au registrar. Resellers do not have direct access to the .au registry.