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