IPv6

IPv6#

Reference data for IPv6 ranges, broadcast addresses, and prefix allocations. Useful when the operator pivots into IPv6-enabled segments or carves up subnets for tooling.

Broadcast addresses#

Address

Description

ff01::2

Node-Local Routers

ff02::1

Link-Local Nodes

ff02::2

Link-Local Routers

ff05::1

Site-Local Nodes

ff05::2

Site-Local Routers

Allocation milestones#

Sub

Equivalent to

/104

One IPv4 Internet (IPv4 /8)

/64

Standard end-user allocation

/48

Standard business allocation

/32

Standard ISP allocation

Bit mapping#

Address text form is eight 16-bit groups, XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX. Each character carries four bits, so the prefix length lines up at fixed offsets in the textual address.

XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX
                                    ||128
                                    |124
                                   120
                                  116
                               |112
                              |108
                             |104
                           100
                          96
                         92
                        88
                      84
                    |80
                   |76
                  72
                 68
               64
              60
             56
           52
          48
         44
        40
       36
     32
    28

Size table#

A full prefix-to-count table appears in the source handbook (pages 100-103). Key reference points:

Prefix

Addresses

/128

1

/64

18,446,744,073,709,551,616

/48

1,208,925,819,614,629,174,706,176

/32

79,228,162,514,264,337,593,543,950,336

/8

1,329,227,995,784,915,872,903,807,060,280,344,576

References#

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