Internationalised Domain Names (IDN)
type: TechArticle
description: IDNs let domain names contain non-ASCII characters. They are encoded as Punycode on the wire and rendered as Unicode in the browser, subject to anti-spoofing rules.
language: en
is part of: Web Specification Studio
author: Web Specification Studio
publisher: Web Specification Studio
license: https://creativecommons.org/licenses/by/4.0/
date modified: 2026-05-29T18:54:03.000Z
citation: RFC 5891 — IDNA 2008: Protocol
  type: CreativeWork
  publisher: IETF
citation: RFC 5890 — IDNA 2008: Definitions and Document Framework
  type: CreativeWork
  publisher: IETF
citation: Unicode TR #46 — Unicode IDNA Compatibility Processing
  type: CreativeWork
  publisher: Unicode
citation: Chromium — IDN in Google Chrome
  type: CreativeWork
  publisher: Chromium project

Web Specification Studio
type: WebSite

Web Specification Studio
type: Organization

breadcrumb
type: BreadcrumbList
item list element: Home
  type: ListItem
  position: 1
  item: https://webspecification.com/
item list element: Spec
  type: ListItem
  position: 2
  item: https://webspecification.com/spec/
item list element: Internationalisation
  type: ListItem
  position: 3
  item: https://webspecification.com/spec/i18n/
item list element: Internationalised Domain Names (IDN)
  type: ListItem
  position: 4
  item: https://webspecification.com/spec/i18n/idn-support/