Structure Of An Ipv6 Address - Siemens SCALANCE XM-400 Configuration Manual

2.6.6

Structure of an IPv6 address

IPv6 address format - notation
IPv6 addresses consist of 8 fields each with four-character hexadecimal numbers (128 bits in
total). The fields are separated by a colon.
Example:
fd00:0000:0000:ffff:02d1:7d01:0000:8f21
Rules / simplifications:
● If one or more fields have the value 0, a shortened notation is possible.
The address fd00:0000:0000:ffff:02d1:7d01:0000:8f21 can also be shortened and written
as follows:
fd00::ffff:02d1:7d01:0000:8f21
To ensure uniqueness, this shortened form can only be used once within the entire
address.
● Leading zeros within a field can be omitted.
The address fd00:0000:0000:ffff:02d1:7d01:0000:8f21 can also be shortened and written
as follows:
fd00::ffff:2d1:7d01:0000:8f21
● Decimal notation with periods
The last 2 fields or 4 bytes can be written in the normal decimal notation with periods.
Example: The IPv6 address fd00::ffff.125.1.0.1 is equivalent to fd00::ffff:7d01:1
Structure of the IPv6 address
The IPv6 protocol distinguishes three types of address: Unicast , anycast and multicast. The
following section describes the structure of the global unicast addresses.
IPv6 prefix
Global prefix:
n bits
Assigned address
range
The prefix for the link local address is always fe80:0000:0000:0000. The prefix is shortened
and noted as follows: fe80::
SCALANCE XM-400/XR-500 Command Line Interface (CLI)
Configuration Manual, 06/2016, C79000-G8976-C252-11
Subnet ID
m bits
Description of the location, also
subnet prefix or subnet
2.6 Interface identifiers and addresses
Suffix
Interface ID
128 - n - m bits
Unique assignment of the host in the net-
work.
The ID is generated from the MAC ad-
dress.
Description
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