RFC 9839 · PROPOSED STANDARD · 2025
SUN · 14 JUN 2026
Unicode Character Repertoire Subsets
Overview
RFC 9839, “Unicode Character Repertoire Subsets”, is a Proposed Standard document published in August 2025 by T. Bray, P. Hoffman. The canonical text is published by the RFC Editor.
Abstract
This document discusses subsets of the Unicode character repertoire for use in protocols and data formats and specifies three subsets recommended for use in IETF specifications.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
Read this RFC
The canonical text of RFC 9839 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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