RFC 3531 · INFORMATIONAL · 2003

A Flexible Method for Managing the Assignment of Bits of an IPv6 Address Block

Overview

RFC 3531, “A Flexible Method for Managing the Assignment of Bits of an IPv6 Address Block”, is an Informational document published in April 2003 by M. Blanchet. The canonical text is published by the RFC Editor.

Abstract

This document proposes a method to manage the assignment of bits of an IPv6 address block or range. When an organisation needs to make an address plan for its subnets or when an ISP needs to make an address plan for its customers, this method enables the organisation to postpone the final decision on the number of bits to partition in the address space they have. It does it by keeping the bits around the borders of the partition to be free as long as possible. This scheme is applicable to any bits addressing scheme using bits with partitions in the space, but its first intended use is for IPv6. It is a generalization of RFC 1219 and can be used for IPv6 assignments. This memo provides information for the Internet community.

Abstract as published in the RFC, via rfc-editor.org.

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 3531 is hosted at rfc-editor.org. Available in TXT,HTML.

Other RFCs from 2003

Who Is Online

In total there are 55 users online: 0 registered, 47 guests and 8 bots.

Most users ever online was 1,226 on 13 Jun 2026, 3:56 am.

Bots: AhrefsBot Applebot Baiduspider Bingbot Majestic Other Bot SemrushBot Sogou

Users active in the past 15 minutes. Total registered members: 354