.io ccTLD
The .io domain is the country-code top-level domain (ccTLD) for the British Indian Ocean Territory. Though originally assigned to a remote territory with no permanent population, it has become one of the most popular domain extensions among technology startups, developers, and SaaS companies due to its association with 'I/O' (input/output) in computing. It is widely used for tech brands, APIs, open-source tools, and multiplayer browser games known as '.io games'.
Individuals and organizations worldwide may register second-level .io domains. No residency or local presence is required. Third-level domains (e.g., xyz.com.io) are restricted to inhabitants of the British Indian Ocean Territory — though none exist. Domain names may not contain sexual or illegal content and must follow standard character rules (alphanumeric, hyphens only, 3–63 characters).
.io Domain Overview
The .io extension is a country-code top-level domain (ccTLD) in the Domain Name System (DNS). It is managed by Internet Computer Bureau Limited. .io was introduced in 1997. Registration prices start from USD 28.12 - 64.29.
Registration Info
Price range based on 3 registrars. Actual prices may vary.
Security Features
- DNSSEC
- CAA Record Support
Where to Register a .io Domain — Price Comparison
Compare .io domain registration and renewal prices across 3 registrars. Prices are in USD and updated daily.
| Registrar | Registration | Renewal | Transfer |
|---|---|---|---|
| porkbun Cheapest | $28.12 | $51.80 | $51.80 |
| dynadot | $28.89 | $53.50 | $53.50 |
| resellerclub | $64.29 | $76.49 | $64.29 |
Prices checked April 7, 2026. Prices exclude ICANN fees where applicable and may vary by registrar promotions or contract terms.
What Is the History of .io?
The .io domain was delegated by IANA to British entrepreneur Paul Kane in 1997 under the Internet Computer Bureau. Kane managed it privately until 2017, when he sold the company to Afilias for $70.17 million. In 2020, Afilias was acquired by Donuts. The British government has repeatedly stated it receives no revenue from .io domain sales, despite claims by Kane that profits supported the territory. In 2021, an international tribunal ruled the UK has no sovereignty over the Chagos Archipelago, casting legal uncertainty on the domain’s future. The UK disputes the ruling, and no changes have been made to domain administration.
Did you know?
The .io TLD serves a specific purpose in the domain ecosystem, providing users with clear context about the websites using this extension.
What Is .io Used For?
The .io TLD is commonly used for the following purposes:
Technology startups and SaaS companies
Developer tools and APIs
Open-source projects
Browser-based multiplayer games (.io games)
Short, memorable domain hacks
Popular Websites
How Do I Register a .io Domain?
Eligibility
No geographic or residency requirements. Domain names must be 3–63 characters, use only alphanumeric characters and hyphens (not starting/ending with hyphens or containing consecutive hyphens). No unlawful or pornographic content permitted.
Open Registration
The .io TLD is available for registration through accredited domain registrars.
Registration Process
- Choose an accredited domain registrar that offers .io domains
- Check domain availability using the registrar's search tool
- Complete the registration process and provide required information
- Pay the registration fee (typically USD 28.12 - 64.29)
- Manage your domain settings through your registrar's control panel
.io vs Related Domain Extensions
How does .io compare to similar top-level domains? This comparison covers pricing, type, and availability to help choose the right domain extension.
View the full TLD Directory to browse all 1,900+ top-level domains with pricing, registration density analysis, and DNSSEC adoption rates.
Frequently Asked Questions
How Is This .io Data Compiled?
DNS Checker maintains a comprehensive TLD directory covering all 1,900+ active top-level domains. The data on this page combines multiple authoritative sources to provide information not found in standard TLD listings.
Zone File Analysis
Domain registration counts and density analysis are computed daily from TLD zone files, providing accurate registration statistics rather than estimates.
DNSSEC Adoption Tracking
DNSSEC deployment percentages are measured by scanning actual DNS records across all registered domains in each TLD zone.
Registrar Price Monitoring
Registration, renewal, and transfer prices are checked hourly across multiple accredited registrars and compared automatically.
Provider Market Share
DNS provider distribution is calculated from nameserver records, showing which hosting providers serve the most domains in each TLD.
Use DNS Checker tools to inspect any .io domain: run a full DNS health check, check DNS propagation, look up WHOIS records, or verify email authentication.
Disclaimer: The information on this page is sourced from IANA, ICANN, and respective registry operator publications, then structured and formatted with the assistance of AI. While accuracy is a priority, details such as pricing, registration requirements, and policies may change. Always verify with the official registry or an accredited registrar before making registration decisions.