.io has been the default "we're a tech startup" TLD for over a decade. Short, memorable, meaningful to developers (input/output), and often available when .com isn't. Companies like Intercom, Notion, and dozens of unicorns started their lives on .io. But 2025 changed the picture. The UK signed a treaty transferring sovereignty of the Chagos Islands (the territorial foundation of .io) to Mauritius. If the ISO 3166 standard drops "IO" as a country code, ICANN's retirement policy would trigger a minimum five-year phaseout. Most industry observers expect .io to survive — but "most" isn't "all," and the market has priced in some risk.
Key Facts About .io
- Registry operator: Internet Computer Bureau (owned by Identity Digital)
- Launched: 1997
- Total registrations: ~1.6 million
- Best for: B2B developer tools, dev-focused SaaS, technical infrastructure
- Our scoring engine multiplier: 15% of the equivalent .com value
The Chagos situation in 60 seconds
.io is the country-code TLD (ccTLD) for the British Indian Ocean Territory (BIOT), a cluster of 58 islands in the Indian Ocean. In October 2024, the UK announced it would transfer sovereignty to Mauritius. The treaty was signed May 22, 2025. The term "British Indian Ocean Territory" is absent from the new treaty — a notable detail.
If ISO 3166-1 removes "IO" as a country code (this is a separate decision by the ISO body, not ICANN), ICANN's community-developed retirement policy triggers a minimum five-year phaseout. Historical precedent suggests this could stretch much longer. The .su (Soviet Union) domain is still active 34 years after the USSR dissolved.
For a full breakdown, see our dedicated .io risk analysis.
What the market is doing
Sedo and other brokers have noted a causal relationship between the .ai surge and the cooling of .io premium sales. Buyers who previously might have paid $50,000+ for a short brandable .io are now either choosing .ai or waiting. But six-figure .io sales still happened throughout 2025, and the extension continues to attract serious end-user buyers.
Our multiplier
Our scoring engine currently values .io at 15% of the equivalent .com — down from pre-2024 levels when we used 20–25%. This reflects the measurable market discount without writing the extension off.
What's your .io domain worth?
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Appraise a Domain →Notable .io Sales
| Domain | Sale Price | Year |
|---|---|---|
| Chat.io | $700,000 | 2014 |
| Fit.io | $160,000 | 2015 |
| Auto.io | $150,000 | 2022 |
| Pro.io | $75,000 | 2020 |
| Data.io | $60,000 | 2019 |
| DHI.io | $8,999 | 2025 |
Pros and Cons
Advantages
- Short and clean — two characters post-dot
- Strong tech/developer audience recognition
- Often available when .com equivalent is taken
- Meaningful double meaning (input/output)
- SEO-neutral per Google guidance
- Still a healthy aftermarket for premium short names
Drawbacks
- Chagos Islands sovereignty transfer creates governance uncertainty
- ICANN 5-year phaseout could trigger if ISO 3166 drops 'IO' code
- Premium sales cooling as buyers pivot to .ai
- Non-technical users don't recognize it
- 3-5x more expensive than .com
- Market sentiment has softened noticeably since late 2024
Where to Register .io
Pricing varies significantly across registrars. The numbers below are typical current market rates — always check the registrar's site for current offers, especially renewal pricing.
| Registrar | First Year | Renewal | |
|---|---|---|---|
| Spaceship Recommended | $29.08 | $42.98 | Register |
| GoDaddy | $44.99 | $54.99 | Register |
| Namecheap | $32.98 | $44.98 | Register |
| Dynadot | $27.99 | $39.99 | Register |
Frequently Asked Questions
Is .io going away?
Not immediately. Even in the worst-case scenario (ISO 3166 removes the IO code), ICANN's retirement policy requires a minimum five-year phaseout. Historical precedent suggests these processes often stretch far longer.
Should I switch from .io to another TLD?
For mission-critical production domains, secure a .com backup as a defensive move, but don't rush to migrate. The SEO and brand damage from a migration typically exceeds the risk of keeping .io.
How much does a .io domain cost?
Registration ranges from $27 to $55 per year depending on registrar. Some registrars raised prices in 2024-2025 citing uncertainty; others held flat.
Is .io good for SEO?
Yes — Google has confirmed repeatedly that non-.com TLDs face no inherent SEO penalty. Ranking is based on site quality, not extension.
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