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XVIII CIDR and IPv6
The text representation of IPv6 addresses
in CIDR is just as seen previously in the way IP(v4) addresses prefixes
are written. The notation is Ipv6 Addresses/prefix length.
![[spacer]](1p.gif)  CIDR Prefix Lengths in IPv6
CIDR prefix lengths are written in decimal (Base 10)
An example of this for an IPv6 address with a 60-bit subnet mask (network prefix) would be:
12AB:0000:0000:CD30:0000:0000:0000:0000:/60
OR
12AB::CD30:0:0:0:0/60
OR
12AB0:0:CD30::/60
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Study the above example and you can
see that the rule of placing at least one zero per 16 bit address, using
the syntax of ::, is used only once per IP address. Also, note
that the prefix length (subnet mask) listed after the IP address
with a /number, is listed in decimal, not hexadecimal.
It is assumed by now you have a basic
understanding of how quickly numeric permutations grow quickly in Base
2 math, and explode with possibilities with Base 16 (hexadecimal) math.
The transition to Ipv6 will provide the Internet with many thousands
of unique-IP numbers, for every square meter of the planet known as
Earth.
Another driving need in TCP/IP beyond
increasing the number of available IP addresses is also covered in Ipv6.
We touch on quality of Service briefly in the next section.
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