General
- Extension
- .com.au
- Type
- Second-level extension
- Meaning
- Second-level zone under .au (Australia)
- Parent extension
- .au
- Registry
- .au Domain Administration (auDA)
- Registry website
- www.auda.org.au/domains/au-domains
- Registered since
- 5 March 1986 (.au)
Properties
- DNSSEC in the root zone
- .au: yes
- Name servers
- .au: 5 (5 with IPv6)
- WHOIS server
- whois.auda.org.au
- RDAP server
- rdap.cctld.au/rdap
- At 1blu
- on request via kissdomain
Registration conditions
- Who may register?
- Only businesses with a connection to Australia, e.g. with an ABN, ACN, ARBN or Australian trademark.
- Allocation
- The name must match the registrant: company or personal name, its abbreviation, an Australian trademark or a product or service offered. Otherwise first come, first served.
- Length
- At least 2 characters.
- Characters
- a–z, 0–9 and hyphen. No hyphen at the beginning or end, not in positions 3 and 4.
- Term
- 1 to 5 years. Eligibility is checked at registration and renewal.
- Registrant data
- Proxy and privacy services are not permitted.
Sources: auDA: .au Domain Administration Rules: Licensing · auDA: com.au domain names · IANA Root Zone Database: .au · As of 25 October 2026