Web-based Configuration Guide Network Settings
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4.17.2 IPv6 Basic
1. IPv6 Address Format
IPv6 increases the length of the address from 32 bits in IPv4 to 128 bits, and therefore
has a larger address space than IPv4.
The basic format of an IPv6 address is X:X:X:X:X:X:X:X. The 128-bit IPv6 address is
divided into eight 16-bit sections that are separated by colons (:), and 16 bits in each
section are represented by four hexadecimal characters (0–9 and A–F). Each X represents
a 4-character hexadecimal number.
For example: 2001:ABCD:1234:5678:AAAA:BBBB:1200:2100, 800:0:0:0:0:0:0:1,
1080:0:0:0:8:800:200C:417A
The number 0 in the IPv6 address can be abbreviated as follows:
The starting 0s can be omitted. For example,
2001:00CD:0034:0078:000A:000B:1200:2100 can be written as
2001:CD:34:78:A:B:1200:2100.
Consecutive 0s can be replaced by two colons (::). For example, 800:0:0:0:0:0:0:1 can be
written as 800::1. Consecutive 0s can be replaced by two colons only when the 16-bit
section contains all 0s, and the two colons can only appear once in the address.
2. IPv6 Prefix
An IPv6 address consists of two parts:
Network prefix: It contains n bits, and is equivalent to the network ID in an IPv4
address.
Interface identifier: It contains (128 - n) bits, and is equivalent to the host ID in an IPv4
address.
The length of the network prefix is separated from the IPv6 address by a slash (/). For
example, 12AB::CD30:0:0:0:0/60 indicates that the length of the prefix used for routing in
the address is 60 bits.
3. Special IPv6 Address
There are also some special IPv6 addresses, for example:
fe80::/8 is a link local address, and equivalent to 169.254.0.0/16 in IPv4.
fc00::/7 is a local address, and similar to 10.0.0.0/8, 172.16.0.0/16, or 192.168.0.0/16 in
IPv4.
ff00::/12 is a multicast address, and similar to 224.0.0.0/8 in IPv4.
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