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UA Day

Held annually and organized by the community-led Universal Acceptance Steering Group (UASG) and ICANN, UA Day was established as a means to rally local, regional, and global stakeholders to spread awareness and encourage UA adoption through a mix of virtual, in-person, and hybrid informational and training sessions.

The first UA Day was held on 28 March 2023 and marked the first time a diverse set of technical and language communities, companies, governments, and Domain Name System (DNS) industry stakeholders mobilized to champion UA and a multilingual Internet on a global scale.

UA Day events are open to all relevant organizations and professionals, including ICANN Regional At-Large Organizations, At-Large Structures, Supporting Organizations and Advisory Committees, government officials, international organizations, technology experts, open-source communities, standards bodies, email service providers, software and technology developers, web hosting platforms, academics, DNS industry professionals, and language communities.

To learn more about UA Day and for upcoming information on UA Day in 2024, visit

UA Day Resources

UA Day resources including presentations, training materials, and videos are available here. For more UA training materials, visit the UA training page.

UA Day messages from leaders in the APAC region are available here.

UA Day 2024 Events Schedule

Click here for a schedule of UA Day 2024 events.

UA Day 2023 Recaps

The UA Day Recap Report provides participation figures from the first UA Day held in 2023. View and download the report below.

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Domain Name System
Internationalized Domain Name ,IDN,"IDNs are domain names that include characters used in the local representation of languages that are not written with the twenty-six letters of the basic Latin alphabet ""a-z"". An IDN can contain Latin letters with diacritical marks, as required by many European languages, or may consist of characters from non-Latin scripts such as Arabic or Chinese. Many languages also use other types of digits than the European ""0-9"". The basic Latin alphabet together with the European-Arabic digits are, for the purpose of domain names, termed ""ASCII characters"" (ASCII = American Standard Code for Information Interchange). These are also included in the broader range of ""Unicode characters"" that provides the basis for IDNs. The ""hostname rule"" requires that all domain names of the type under consideration here are stored in the DNS using only the ASCII characters listed above, with the one further addition of the hyphen ""-"". The Unicode form of an IDN therefore requires special encoding before it is entered into the DNS. The following terminology is used when distinguishing between these forms: A domain name consists of a series of ""labels"" (separated by ""dots""). The ASCII form of an IDN label is termed an ""A-label"". All operations defined in the DNS protocol use A-labels exclusively. The Unicode form, which a user expects to be displayed, is termed a ""U-label"". The difference may be illustrated with the Hindi word for ""test"" — परीका — appearing here as a U-label would (in the Devanagari script). A special form of ""ASCII compatible encoding"" (abbreviated ACE) is applied to this to produce the corresponding A-label: xn--11b5bs1di. A domain name that only includes ASCII letters, digits, and hyphens is termed an ""LDH label"". Although the definitions of A-labels and LDH-labels overlap, a name consisting exclusively of LDH labels, such as"""" is not an IDN."