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An IPv6 (Dual) address combines an IPv6 and an IPv4 address and has the following
format:
y : y : y : y : y : y : x . x . x . x
. The IPv6 portion of the address
(indicated with y's) is always at the beginning, followed by the IPv4 portion (indicated with
x's).
•
In the IPv6 portion of the address,
y
is called a
segment
and can be any hexadecimal
value between 0 and FFFF. The segments are separated by colons - not periods. The
IPv6 portion of the address must have six segments but there is a short form notation
for segments that are zero.
•
In the IPv4 portion of the address
x
is called an
octet
and must be a decimal value
between 0 and 255. The octets are separated by periods. The IPv4 portion of the
address must contain three periods and four octets.
Examples of valid IPv6 (Dual) addresses:
•
2001 : db8: 3333 : 4444 : 5555 : 6666 : 1 . 2 . 3 . 4
•
: : 11 . 22 . 33 . 44
(implies all six IPv6 segments are zero)
•
2001 : db8: : 123 . 123 . 123 . 123
(implies that the last four IPv6 segments
are zero)
•
: : 1234 : 5678 : 91 . 123 . 4 . 56
(implies that the first four IPv6 segments
are zero)
•
: : 1234 : 5678 : 1 . 2 . 3 . 4
(implies that the first four IPv6 segments are
zero)
•
2001 : db8: : 1234 : 5678 : 5 . 6 . 7 . 8
(implies that the middle two IPv6
segments are zero)
•
Subnet masks (IPv4) and prefix lengths (IPv6)
This topic defines subnet masks and prefixes.
Parent topic:
Subnet masks (IPv4) and prefix lengths (IPv6)
This topic defines subnet masks and prefixes.
