For most Australian businesses selling overseas, the best domain extension is two of them: keep your .com.au as home for Australian customers and add the matching .com for everyone else. If the .com is taken, .co and .io work, but each comes with trade-offs you should accept knowingly. The right mix depends on where your customers are, not on what’s fashionable.
Key takeaways
- Google treats .com.au as a strong signal that a site targets Australia. It treats .co and .io as generic, like .com.
- .com is still the default people type. If you use .co, some visitors and emails will end up at the .com by habit.
- .io’s long-term future is less certain since the UK agreed to hand the Chagos Islands to Mauritius.
- Running .com.au and .com together is common. The simplest setup points one at the other.
Which domain extension is best for a business going global?
It depends on who you sell to. A plumber in Ipswich and a software company with customers in Texas need different answers. Here’s how the common options compare:
| Extension | How Google treats it | Best for | Watch for |
|---|---|---|---|
| .com.au | Targets Australia | Businesses whose customers are mainly Australian | Needs an ABN, ACN or trade mark, kept active |
| .au | Targets Australia | A shorter Australian address | Mostly bought to protect a .com.au |
| .com | Generic, no country | Exporters, online services, international brands | Good names are hard to find |
| .co | Generic, no country | Start-ups when the .com is taken | People type .com by mistake |
| .io | Generic, no country | Tech and software products | Uncertain long-term future |
For a fuller look at the Australian options, our guide to .com.au, .net.au and .au covers who can register each one.
Does a .com.au hurt you overseas?
For search, it can. Google calls a country-code domain like .com.au a “strong signal” that a site targets that country (Google Search Central). That helps you in Australia. It works against you if most of your buyers are in the UK or the US.
Trust works the same way. auDA’s research says 8 in 10 Australian consumers are more likely to trust Australian businesses with a .au website (auDA). An American buyer has no such habit. To them, .com looks local and .com.au looks foreign.
So a .com.au is an asset at home and a mild handicap abroad. That’s why many exporters keep both.
Is .com still worth chasing?
Usually, yes. It’s by far the largest extension, with 166.6 million registrations at the end of June 2026, out of 401.6 million across all extensions (DN Journal, reporting Verisign). That size is why it’s the default people type, and also why short names are scarce.
If your exact name is taken as a .com, try a small addition before switching extension. “getacme.com”, “acmeaustralia.com” or “acmetools.com” often beat “acme.co” for real-world use. Run a domain name search across several versions before you decide.
.co vs .com: what’s the catch?
.co is Colombia’s country code, but Google treats it as generic, so it won’t tie your site to Colombia. It’s on the same Google list as .io, .ai and .me. Search isn’t the problem. Habit is.
People type “.com” without thinking. In our experience, a business on .co will see some visitors land on someone else’s .com, and some customer emails go there too. If the .com owner is a competitor, or sets up a catch-all inbox, that’s a real leak. If you choose .co, try to buy the .com later, or at least know who owns it.
Is a .io domain safe for a long-term business?
.io belongs to the British Indian Ocean Territory, the Chagos Islands. In October 2024, the UK and Mauritius announced a treaty to transfer sovereignty of the islands to Mauritius (The Register).
ICANN’s view is that this doesn’t automatically end .io. If the “IO” code were ever removed from the international country code list, a retirement process would begin, with five years to phase the domain out, possibly longer (ICANN). That’s a lot of notice, but it isn’t zero risk.
For a tech product that may rebrand anyway, .io is still a reasonable choice. For a business you plan to run for twenty years, we’d lean towards a .com or .com.au as the main address.
How do you run .com.au and .com together?
There are three common setups. Google’s guidance supports all of them, as long as each version is clear about who it’s for.
- One site, one main address. Pick the address for your biggest market. Point the other domain at it with a permanent redirect. This is the simplest option and suits most small businesses.
- Two sites, one per market. Run .com.au for Australians and .com for everyone else, each with its own prices, shipping and contact details. Link the matching pages with hreflang tags, so Google shows the right one to the right person.
- One .com site with regional sections. Use folders such as /au/ and /us/. It’s easy to maintain, but Google says visitors may not recognise the targeting from the URL alone.
Whichever you choose, don’t redirect visitors automatically based on their location. Google warns that this can stop people and its crawler from seeing every version (Google Search Central). Offer a clear country switcher instead.
Which other extensions should you register?
You don’t need dozens. A sensible set for an exporter is the .com.au, the .au direct and the .com, all pointing to your main site. Add a country domain only when you actually trade there, because some, like .com.au, have their own eligibility rules (auDA).
Our guide to defensive domain registration covers misspellings and which extras are worth the renewal fees. Whatever you buy, register it in your business’s name, not a staff member’s or your web designer’s.
How we help with domains here and overseas
You can register your domain with WMS, including .com.au at $80 + GST for two years. Our .com and international domains sit in the same account, so renewals and DNS live in one place. If you’re setting up separate sites for different markets, our design and marketing from the Next Level Creative family can plan the structure and the hreflang setup with you.
Frequently asked questions
Is .com or .com.au better for SEO in Australia?
For Australian searches, .com.au has an edge because Google treats it as a strong signal that the site targets Australia. A .com can still rank well here with Australian content and links. For customers overseas, a .com usually works better.
Does Google treat .co as a Colombian domain?
No. Google lists .co among the country codes it treats as generic, along with .io, .ai, .me and .tv. A .co site isn’t targeted to Colombia, so you can use it anywhere. The main drawback is people typing .com by habit.
Will .io domains stop working?
Not suddenly. ICANN says that if the IO code were removed from the international list, a retirement process with about five years’ notice would begin. When ICANN wrote that in November 2024, the code was still on the list. It’s a long-term risk to weigh, not an immediate one.
Can I point my .com and .com.au to the same website?
Yes. Choose one as the main address and set the other to redirect to it permanently. Don’t show the same site at both addresses without a redirect, because search engines then have to guess which version to show.
Do I need an Australian business to register a .com?
No. Anyone can register a .com. You do need an ABN, ACN, ARBN or Australian trade mark for a .com.au, and you must keep that eligibility for as long as you hold the name.
Sources
- Managing multi-regional and multilingual sites, Google Search Central
- .au Product Guide 2026, auDA
- Verisign Q2 2026 Domain Name Industry Brief coverage, DN Journal, 24 July 2026
- The .io domain isn’t going anywhere anytime soon amid treaty, The Register, 10 October 2024
- The Chagos Archipelago and the .io domain, ICANN, 14 November 2024
- com.au and net.au rule changes, auDA