1. Introduction

1. Introduction

This memo discusses the strategy for address assignment of the

existing 32-bit IPv4 address space with a view toward conserving the

address space and limiting the growth rate of global routing state.

This document obsoletes the original CIDR spec [RFC1519], with

changes made both to clarify the concepts it introduced and, after

more than twelve years, to update the Internet community on the

results of deploying the technology described.

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