The history and development of the .io domain

Introduction

.io is a country-code top-level domain for the British Indian Ocean Territory. IANA records September 16, 1997 as the registration date and lists Internet Computer Bureau Limited as the ccTLD manager.IANA delegation record Under the general model described by RFC 1591, two-letter country-code domains are organized by an administrator for the relevant country or territory.RFC 1591

Name and original use

.io began as the two-letter country-code namespace assigned to the British Indian Ocean Territory. IANA classifies it as a country-code top-level domain and dates its delegation record to September 16, 1997.IANA delegation record RFC 1591

Development timeline

Date	Event
March 1994	RFC 1591 described the administrative model for two-letter country-code domains.RFC 1591
September 16, 1997	IANA’s delegation record dates .io to this day.IANA delegation record
2021	NIC.IO’s FAQ, whose copyright notice identifies the 1997–2021 registry operator, describes Internet Computer Bureau as the .IO country-code manager and registry operator.NIC.IO FAQ
2026	IANA’s current delegation record continues to list Internet Computer Bureau Limited as the ccTLD manager.IANA delegation record

Registry and policy changes

IANA lists Internet Computer Bureau Limited as the .io ccTLD manager and points to NIC.IO for registration services.IANA delegation record NIC.IO’s FAQ likewise identifies Internet Computer Bureau Ltd as manager and registry operator for .IO, .AC and .SH.NIC.IO FAQ

The registry’s published rules state that a nameserver does not have to be physically located in the British Indian Ocean Territory.NIC.IO domain rules Its FAQ also states that .IO domains are issued on a first-come, first-served basis.NIC.IO FAQ

Use and market development

Although .io is a country-code domain, its published rules do not require nameservers to be located in the territory, and registrations are issued on a first-come, first-served basis.NIC.IO domain rules NIC.IO FAQ Its administrative classification does not prescribe how a registrant uses or presents a domain name.

Related suffixes and concepts

.io’s country-code classification supplies the administrative context for the territory named in its IANA record.IANA delegation record That classification does not determine how a registrant chooses to use a domain name.