Please Whitelist This Site?

I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)

If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.

If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.

Thanks for your understanding!

Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide


NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The Book is Here... and Now On Sale!

Enjoy The TCP/IP Guide? Get the complete PDF!
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Internet Layer (OSI Network Layer) Protocols
           9  Internet Protocol (IP/IPv4, IPng/IPv6) and IP-Related Protocols (IP NAT, IPSec, Mobile IP)
                9  Internet Protocol Version 6 (IPv6) / IP Next Generation (IPng)
                     9  IPv6 Addressing

Previous Topic/Section
IPv6 Interface Identifiers and Physical Address Mapping
Previous Page
Pages in Current Topic/Section
1
23
Next Page
IPv6/IPv4 Address Embedding
Next Topic/Section

IPv6 Special Addresses: Reserved, Private (Link-Local / Site-Local), Unspecified and Loopback
(Page 1 of 3)

Just as certain IPv4 address ranges are designated for reserved, private and other “unusual” addresses, a small part of the monstrous IPv6 address space has been set aside for special addresses. The purpose of these addresses and address blocks is to provide addresses for special requirements and private use in IPv6 networks. The nice thing about IPv6, of course, is that even relatively small pieces of it are still enormous, so setting aside 0.1% of the address space for a particular use still generally yields more addresses than anyone will ever need.

Special IPv6 Address Types

There are four basic types of "special" IPv6 addresses: reserved, private, loopback and unspecified.

Reserved Addresses

A portion of the address space is set aside as reserved for various uses by the IETF, both present and future. Unlike IPv4, which has many small reserved blocks in various locations in the address space, in IPv6 the reserved block is at the “top” of the address space: the ones starting with “0000 0000” (or 00 for the first hexadecimal octet). This represents 1/256th of the total address space. Some of the special addresses below come from this block. IPv4 address embedding is also done within this reserved address area.

Note: Note that reserved addresses are not the same as unassigned addresses. The latter term just refers to blocks whose use has not yet been determined.



Previous Topic/Section
IPv6 Interface Identifiers and Physical Address Mapping
Previous Page
Pages in Current Topic/Section
1
23
Next Page
IPv6/IPv4 Address Embedding
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.