Comprehensive information about all top-level domains (TLDs) including generic, country code, and brand-specific domains.
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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).
Price range based on 3 registrars. Actual prices may vary.
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.
The .io TLD serves a specific purpose in the domain ecosystem, providing users with clear context about the websites using this extension.
The .io TLD is commonly used for the following purposes:
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.
The .io TLD is available for registration through accredited domain registrars.
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 I strive for accuracy, details such as pricing, registration requirements, and policies may change. Always verify with the official registry or an accredited registrar before making registration decisions.