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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.

 CIDR Prefix Lengths in IPv6CIDR 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:/60OR12AB::CD30:0:0:0:0/60OR12AB0:0:CD30::/60

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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