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An IPv6 Aggregatable Global Unicast Address Format (RFC2374) Disclosure Number: IPCOM000002946D
Original Publication Date: 1998-Jul-01
Included in the Prior Art Database: 2019-Feb-15
Document File: 12 page(s) / 16K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Hinden: AUTHOR [+2]

Related Documents

10.17487/RFC2374: DOI


This document defines an IPv6 aggregatable global unicast address format for use in the Internet. [STANDARDS-TRACK]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 14% of the total text.

Network Working Group R. Hinden Request for Comments: 2374 Nokia Obsoletes: 2073 M. O’Dell Category: Standards Track UUNET S. Deering Cisco July 1998

An IPv6 Aggregatable Global Unicast Address Format

Status of this Memo

This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1998). All Rights Reserved.

1.0 Introduction

This document defines an IPv6 aggregatable global unicast address format for use in the Internet. The address format defined in this document is consistent with the IPv6 Protocol [IPV6] and the "IPv6 Addressing Architecture" [ARCH]. It is designed to facilitate scalable Internet routing.

This documented replaces RFC 2073, "An IPv6 Provider-Based Unicast Address Format". RFC 2073 will become historic. The Aggregatable Global Unicast Address Format is an improvement over RFC 2073 in a number of areas. The major changes include removal of the registry bits because they are not needed for route aggregation, support of EUI-64 based interface identifiers, support of provider and exchange based aggregation, separation of public and site topology, and new aggregation based terminology.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC 2119].

Hinden, et. al. Standards Track [Page 1]

RFC 2374 IPv6 Global Unicast Address Format July 1998

2.0 Overview of the IPv6 Address

IPv6 addresses are 128-bit identifiers for interfaces and sets of interfaces. There are three types of addresses: Unicast, Anycast, and Multicast. This document defines a specific type of Unicast address.

In this document, fields in addresses are given specific names, for example "subnet". When this name is used with the term "ID" (for "identifier") after the name (e.g., "subnet ID"), it refers to the contents of the named field. When it is used with the term "prefix" (e.g. "subnet prefix") it refers to all of the addressing bits to the left of and including this field.

IPv6 unicast addresses are designed assuming that the Internet routing system makes forwarding decisions based on a "longest prefix match" algorithm on arbitrary bit boundaries and does not have any knowledge of the internal structure of IPv6 addresses. The structure in IPv6 addresses is for assignment and allocation. The only exception to this is the distinction made between unicast and multicast addresses.

The specific type of an IPv6 address is indicated by the leading bits in the address. The variable-length field comprising these leading bits is called the Format Prefix (FP).

This document defines an address format for the 001 (binary) Fo...