What Is a .io Domain?
A .io domain is the country code TLD (ccTLD) assigned to the British Indian Ocean Territory. In practice, .io has become the go-to domain extension for tech startups, developer tools, and SaaS products. The association with "I/O" (input/output) in computing, combined with good name availability, made it a natural fit for the tech world.
Who uses .io domains:
- Developer tools and APIs (GitHub Pages was early to adopt)
- SaaS platforms and B2B software
- Open-source projects
- Game development (agar.io popularized browser games on
.io) - Tech startups that want credibility without paying
.comaftermarket prices
Search .io domains to check availability and pricing.
.io Pricing and Registration
.io domains typically cost $32–80/year depending on the registrar. Unlike some TLDs, .io has no registry-level premium pricing — all standard names cost the same base rate.
Registration details:
- Open to anyone worldwide, no restrictions
- Available through most major registrars (Namecheap, Porkbun, Cloudflare, GoDaddy)
- Standard 1-year minimum registration
- Renewal pricing usually matches registration pricing
Compare registrar pricing before buying — differences of $15–30 are common for .io domains.
.io and SEO
Google treats .io as a generic TLD, not a country-specific domain. This means:
- Your
.iosite won't be geo-targeted to the British Indian Ocean Territory .ioranks globally just like.com- No inherent SEO advantage or disadvantage versus other extensions
- Domain authority and content quality matter far more than the extension
.io vs. Other Tech Extensions
| Extension | Best For | Typical Price | Perception |
|---|---|---|---|
.io | General tech, dev tools, SaaS | $32–80/year | Established tech credibility |
.ai | AI/ML companies | $80–140/year | AI-focused, premium |
.dev | Developers, portfolios | $12–20/year | Developer-specific |
.app | Software applications | $12–20/year | App-focused, requires HTTPS |
.com | Everything | $10–18/year | Universal trust |
The .io Future Question
In 2024, the UK announced plans to transfer sovereignty of the Chagos Islands (the British Indian Ocean Territory) to Mauritius. Since ccTLDs are tied to ISO country codes, this raised questions about .io's future.
What we know:
- Any political transition would take years
- The
.ioregistry has stated domains remain stable - ICANN has historically handled ccTLD transitions gradually (
.sufor the Soviet Union still exists decades later) - Millions of active
.iodomains create strong incentive to maintain the extension
For domain buyers, .io remains a safe choice. The extension has too much commercial value and too many active users to disappear abruptly.
When to Choose .io
Good fit:
- Tech startups where
.comisn't available or affordable - Developer tools, APIs, and infrastructure products
- SaaS platforms targeting technical audiences
- Open-source projects and documentation sites
Not ideal:
- Non-tech businesses (a bakery on
.iowould be confusing) - Targeting non-technical consumers who expect
.com - If the
.comis available and affordable —.comis still the default for mainstream recognition
Search for .io domains or browse all available extensions to compare options.
Frequently Asked Questions
What does .io stand for?
The .io extension is the country code for the British Indian Ocean Territory. In the tech world, it's associated with "I/O" (input/output), a fundamental computing concept. This coincidence helped .io become the default domain for tech startups and developer tools.
Is .io good for SEO?
Google treats .io as a generic TLD, not a country-specific one. Your .io site won't be geo-targeted to the British Indian Ocean Territory and ranks globally like .com. Content quality and domain authority matter far more than the extension.
Is .io going away?
Despite concerns about the UK transferring sovereignty of the Chagos Islands, .io is stable. Any transition would take years, and the extension has too much commercial value and too many active users to disappear abruptly. ICANN has historically handled ccTLD transitions gradually.
How much does a .io domain cost?
Standard .io registration costs $32–80/year depending on the registrar. There's no registry-level premium pricing — all standard names cost the same base rate. Compare registrar pricing before buying.
Is .io or .ai better for a tech startup?
Use .ai if your product is specifically about artificial intelligence — it provides targeted AI branding at $80–140/year. Use .io for general tech products, developer tools, or SaaS — it's cheaper ($32–80/year) and has broad tech credibility without AI-specific meaning.