Check if a domain name is available.
.com.au, .au and .com — in seconds.
Enter your business name or an idea and we'll check availability across the main Australian extensions, live from the registry. Found the one you want? Register it in a couple of clicks.
This free domain name checker tells you whether a domain is available to register or already taken. Type a plain word — like your business name — and we check it across .com.au, .au, .com and .net.au at once, so you can see every extension that's free in one go. Enter a full domain and we'll check just that one. Each result comes straight from the authoritative registry in real time, so it's accurate to the second, not a stale cache. When a domain is available you can register it immediately through Stack2, with WHOIS privacy and auto-renew included on every domain.
Picking the right domain name.
.com.au vs .au
.com.au is the traditional, most-recognised Australian business domain. .au is the newer, shorter option launched in 2022. Both signal you're a local business — many brands register both to protect the name.
Australian eligibility
To register a .com.au or .au you need an ABN, ACN, or a registered Australian trademark. Stack2 runs the eligibility check as part of registration, so there are no surprises at checkout.
What's included
Every domain registered with Stack2 comes with WHOIS privacy and auto-renew included — and DNS or transfer questions are handled by the engineers who run the platform, not a bot.
Domain checker questions, answered.
Type your business name or idea into the checker above. If you enter a plain word we check it across the main Australian extensions — .com.au, .au, .com and .net.au — and show which are free. Enter a full domain like yourbusiness.com.au and we check just that one.
The checker queries the live registry for any extension you enter, including .com.au, .au, .com, .net.au, .org.au and international extensions. Search a plain word and we check the four most common Australian business extensions automatically.
Yes — completely free, with no account and no rate limits. It queries the authoritative registry for each domain in real time, so the availability result is current, not cached.
Yes. Any available domain has a Register button that opens the Stack2 portal with the domain pre-filled. See our domain registration page for pricing and what's included on every domain.
More free tools.
Website X-Ray
A live scan across SSL, performance, security headers, DNS and email protection — translated into plain English as it runs.
Scan a websiteWHOIS Lookup
Look up who registered a domain, when it expires, its status, and its nameservers — straight from the registry.
Run a WHOIS lookupDNS Lookup
Query all DNS records for any domain — A, AAAA, CNAME, MX, TXT, NS, SOA, SPF, DMARC and more.
Run a lookupSSL Certificate Check
Check the SSL certificate for any domain — expiry date, issuer, SANs, and chain validity.
Check a certificateQR Code Generator
Turn any link or text into a scannable QR code — black-on-white or white-on-black, free to download.
Generate a QR codeAll Tools
See every free tool we've built for web professionals — no account, no rate limits.
View all tools