Icon: .io domain extension nTLD

Register a .io domain now

Showcase your creativity with a .io domain name

Enter at least on character

Why register a .io domain?

Not only popular with tech startups

Although the .io domain names have been around as early as 1997, it is still less occupied than other generic and extremely popular top-level domains (TLDs). TLDs with the .io code are an attractive option amongst the tech and startup scene and this is largely due to the fact that the letters stand for input/output within the industry.

Input/output represents the fundamental concept of computers: every input results in an output. Businesses, companies and individuals alike can benefit from the creative freedom of choosing their favored TLD name; a meaningful, unique and concise name may be what it takes to position your business ahead of the competition.

Register your domain name right now
Graphical display: Transferring a domain to IONOS

What does the .io domain ending stand for?

Despite its popularity amongst the tech industry, where the .io domain meaning is commonly known as an abbreviation for input/output, the .io domain name in fact stands for the British Indian Ocean Territory. As with all domain names, each country or territory is assigned its own two-letter country code. Other country code top-level domains (ccTLDs) include, for example, .ca for Canada and .co.uk for the United Kingdom.In recent years, it is not only the tech and startup industry that has been taking advantage of the catchy domain, but also brands or words that are complemented by the .io domain name such as www.aud.io or wwww.mustach.io. This has naturally resulted in fewer businesses actually operating in the British Indian Ocean Territory availing of this specific domain name. It has therefore become less of a representation of the British Indian Ocean, and more of a generic TLD.

Not just a domain name

Register your domain with IONOS and benefit from our comprehensive features.

Email icon that looks like an envelope


A professional email address (for example: me@mycompany.ca) connected to your domain with 2 GB of mailbox space to start. Upgrade anytime for more space.

Icon with a shield and a blue checkmark


For reliable protection of your website visitors and to increase your ranking on Google, one Wildcard SSL Certificate is included per contract.

Domain icon showing linked subdomains

10,000 subdomains

Up to 10,000 subdomains to customize and structure your website, for example: news.mycompany.ca.

Icon with a socket and plug

Easy setup

One-click activation makes it easy to connect your domain with email, hosting, or social media profiles.

Icon with a security shield and padlock

Domain lock

The domain transfer lock ensures your domain cannot be transferred by unauthorized third parties.

Technical support icon

24/7 customer support

Our professional, knowledgeable support team is always available for help and advice, 24/7.

Your personal consultant

At IONOS, you have a dedicated contact person for personalized advice, tips to boost your online success, and technical support. Reach them via phone, chat and email, all at no cost to you as an IONOS customer.

.io domain


Yes, you can easily move an existing .io domain name from another provider to IONOS at any time. This can be done in three simple steps; you can find out how to do this here. Further extensive information about domains and domain relocation is available in the IONOS help center. Our customer support will also be happy to answer your questions on the phone at any time.

Contact us