As part of the .au direct domain registration process, an identity validation check will be conducted, for which you will need to quote the following ID documents as per your residence situation in Australia:
- Australian citizenship document / permanent residency visa grant document
- Australian passport / overseas passport (if you are a permanent resident)
- Latest utility bill (with current address)
Other documents that can substitute a passport:
Australian birth certificate / Australian drivers' licence / Australian photo ID card
Note: The ID document you quote should list your full legal name and date of birth. Your latest utility bill will be used to validate your current residential address in Australia.