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An Appeal to the Internet Community to Return Unused IP Networks (Prefixes) to the IANA (RFC1917)

IP.com Disclosure Number: IPCOM000004158D
Original Publication Date: 1996-Feb-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 9 page(s) / 22K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Nesser: AUTHOR

Abstract

This document is an appeal to the Internet community to return unused address space, i.e. any block of consecutive IP prefixes, to the Internet Assigned Numbers Authority (IANA) or any of the delegated registries, for reapportionment. Similarly an appeal is issued to providers to return unused prefixes which fall outside their customary address blocks to the IANA for reapportionment.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 13% of the total text.

Network Working Group P. Nesser II

Request for Comments: 1917 Nesser & Nesser Consulting

BCP: 4 February 1996

Category: Best Current Practice

An Appeal to the Internet Community to Return

Unused IP Networks (Prefixes) to the IANA

Status of this Memo

This document specifies an Internet Best Current Practices for the

Internet Community, and requests discussion and suggestions for

improvements. Distribution of this memo is unlimited.

Abstract

This document is an appeal to the Internet community to return unused

address space, i.e. any block of consecutive IP prefixes, to the

Internet Assigned Numbers Authority (IANA) or any of the delegated

registries, for reapportionment. Similarly an appeal is issued to

providers to return unused prefixes which fall outside their

customary address blocks to the IANA for reapportionment.

1. Background

The Internet of today is a dramatically different network than the

original designers ever envisioned. It is the largest public data

network in the world, and continues to grow at an exponential rate

which doubles all major operational parameters every nine months. A

common metaphor in engineering is that every time a problem increases

in size by an order of magnitude, it becomes a new problem. This

adage has been true over the lifetime of the Internet.

The Internet is currently faced with two major operational problems

(amoung others). The first is the eventual exhaustion of the IPv4

address space and the second is the ability to route packets between

the large number of individual networks that make up the Internet.

The first problem is simply one of supply. There are only 2^32 IPv4

addresses available. The lifetime of that space is proportional to

the efficiency of its allocation and utilization. The second problem

is mainly a capacity problem. If the number of routes exceeds the

current capacity of the core Internet routers, some routes will be

dropped and sections of the Internet will no longer be able to

communicate with each other. The two problems are coupled and the

dominant one has, and will, change over time.

The initial design of IP had all addresses the same, eight bits of

network number and twenty four bits of host number. The expectation

was of a few, large, global networks. During the first spurts of

growth, especially with the invention of LAN technologies, it became

obvious that this assumption was wrong and the separation of the

address space into three classes (Class A for a few huge networks;

Class B for more, smaller networks; and Class C for those really

small LANs, with lots of network numbers) was implemented. Soon

subnets were added so sites with many small LANs could appear as a

single network to others, the first step at limiting routing table

size. And finally, CIDR was i...