RFC 4193 · PROPOSED STANDARD · 2005
SUN · 14 JUN 2026
Unique Local IPv6 Unicast Addresses
Overview
RFC 4193, “Unique Local IPv6 Unicast Addresses”, is a Proposed Standard document published in October 2005 by R. Hinden, B. Haberman. The canonical text is published by the RFC Editor.
Abstract
This document defines an IPv6 unicast address format that is globally unique and is intended for local communications, usually inside of a site. These addresses are not expected to be routable on the global Internet. [STANDARDS-TRACK]
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 4193 is hosted at rfc-editor.org. Available in TXT,HTML.
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- RFC 4191 Default Router Preferences and More-Specific Routes
- RFC 4195 A Uniform Resource Name Namespace for the TV-Anytime Forum
- RFC 4190 Framework for Supporting Emergency Telecommunications Service in IP Telephony
- RFC 4196 The SEED Cipher Algorithm and Its Use with IPsec
- RFC 4189 Requirements for End-to-Middle Security for the Session Initiation Protocol
- RFC 4197 Requirements for Edge-to-Edge Emulation of Time Division Multiplexed Circuits over Packet Switching Networks