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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

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IPv6 Address and Address Notation and Prefix Representation
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IPv6 Global Unicast Address Format
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IPv6 Address Space Allocation
(Page 2 of 3)

Current IPv6 Address Space Allocation Plans

The allocation of different parts of the address space still is done based on particular patterns of the first three to ten bits of the address, to allow certain categories to have more addresses than others. The elimination of the specific term denoting this is intended to convey that these bits should not be given “special attention”.

Table 60 shows the allocations of the IPv6 address space, and what fraction of the total address space each represents:


Table 60: IPv6 Address Space Allocations

Leading Bits

Fraction of Total IPv6 Address Space

Allocation

0000 0000

1/256

Unassigned (Includes special addresses such as the Unspecified and Loopback addresses)

0000 0001

1/256

Unassigned

0000 001

1/128

Reserved for NSAP Address Allocation

0000 01

1/64

Unassigned

0000 1

1/32

Unassigned

0001

1/16

Unassigned

001

1/8

Global Unicast Addresses

010

1/8

Unassigned

011

1/8

Unassigned

100

1/8

Unassigned

101

1/8

Unassigned

110

1/8

Unassigned

1110

1/16

Unassigned

1111 0

1/32

Unassigned

1111 10

1/64

Unassigned

1111 110

1/128

Unassigned

1111 1110 0

1/512

Unassigned

1111 1110 10

1/1024

Link-Local Unicast Addresses

1111 1110 11

1/1024

Site-Local Unicast Addresses

1111 1111

1/256

Multicast Addresses


This is more complicated than the IPv4 “classful” scheme because there are so many more categories and they range greatly in size, however, most of them are unassigned at the present time.


Previous Topic/Section
IPv6 Address and Address Notation and Prefix Representation
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Pages in Current Topic/Section
1
2
3
Next Page
IPv6 Global Unicast Address Format
Next Topic/Section

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