RFC 4645 · INFORMATIONAL · 2006
SUN · 14 JUN 2026
Initial Language Subtag Registry
Overview
RFC 4645, “Initial Language Subtag Registry”, is an Informational document published in September 2006 by D. Ewell. The canonical text is published by the RFC Editor.
Abstract
This memo defined the initial contents of the IANA Language Subtag Registry for use in forming tags for the identification of languages. Since the contents of this memo only served as a starting point for the registry, its actual contents have been removed before publication to avoid confusion. This memo provides information for the Internet community.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
Read this RFC
The canonical text of RFC 4645 is hosted at rfc-editor.org. Available in TXT,HTML.
Other RFCs from 2006
- RFC 4644 Network News Transfer Protocol Extension for Streaming Feeds
- RFC 4646 Tags for Identifying Languages
- RFC 4643 Network News Transfer Protocol Extension for Authentication
- RFC 4647 Matching of Language Tags
- RFC 4642 Using Transport Layer Security with Network News Transfer Protocol
- RFC 4648 The Base16, Base32, and Base64 Data Encodings
- RFC 4641 DNSSEC Operational Practices
- RFC 4649 Dynamic Host Configuration Protocol for IPv6 Relay Agent Remote-ID Option