Address Allocation for Private Internets Status of this Memo. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited. 1. Introduction

Use caution when setting filters to exclude these private address ranges. In some cases, Regional Internet Registries (RIRs) have issued adjacent address space to their customers and that space is in use on the global Internet. In August 2012, ARIN began allocating "172" address space to internet service, wireless, and content providers RFC1597: Address Allocation for Private Internets, RFC1627: Network 10 Considered Harmful (Some Practices Shouldn't be Codified) PDF eReader This document describes address allocation for private internets. The allocation permits full network layer connectivity among all hosts inside an enterprise as well as among all public hosts of different enterprises. The cost of using private internet address space is the potentially costly effort to renumber hosts and networks between public IPv4 address exhaustion is the depletion of the pool of unallocated IPv4 addresses.Because the original Internet architecture had fewer than 4.3 billion addresses available, depletion has been anticipated since the late 1980s, when the Internet started experiencing dramatic growth. This depletion is one of the reasons for the development and deployment of its successor protocol, IPv6. RFC 1918 : Address Allocation for Private Internets St´ephane Bortzmeyer Premiere r` edaction de cet article le 1 novembre 2007´ Private addresses restrict a network so that its hosts only have partial Internet connectivity. Where full Internet connectivity is needed, unique, public addresses should be used. For a detailed description of "Address Allocation for Private Internets" and the actual ranges of addresses set aside for that purpose, please refer to RFC 1918 11. Private address space. RFC 1918 Address Allocation for Private Internets describes the use of 'private address space' for the operation of private IP networks. IANA has reserved the following three blocks of IPv4 address space for private networks: 10.0.0.0 - 10.255.255.255 (10/8) 172.16.. - 172.31.255.255 (172.16/12)

RFC1597: Address Allocation for Private Internets, RFC1627: Network 10 Considered Harmful (Some Practices Shouldn't be Codified) PDF eReader

Private network Used for local communications within a private network. 100.64.0.0/10 100.64.0.0–100.127.255.255 4 194 304: Private network Shared address space for communications between a service provider and its subscribers when using a carrier-grade NAT. 127.0.0.0/8 127.0.0.0–127.255.255.255 16 777 216: Host

Address Allocation for Private Internets Status of this Memo. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind. Distribution of this memo is unlimited. 1. Introduction

This document describes address allocation for private internets. The allocation permits full network layer connectivity among all hosts inside an enterprise as well as among all public hosts of different enterprises. The cost of using private internet address space is the potentially costly effort to renumber hosts and networks between public This document describes address allocation for private internets. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements. For the definition of Status, see RFC 2026. Private use of other reserved addresses. Despite official warnings, historically some organizations have used other parts of the reserved IP addresses for their internal networks. [citation needed] RFC documents. RFC 1918 - Address Allocation for Private Internets