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XVII IPv6
(Page 3 of 4)
IPv6 Zero Compression
Suppose an existing IP address was
to be converted to IPv6. For this purpose, a special syntax was created
to compress the zeros. That syntax is :: to indicate multiple
groups of 16 bits of zeros.
 IPv6 Address Format
An IPv6 IP address contains 8 16-bit hexadecimal values, separated by the colon (:)
Contrast the IPv6 examples above with the current IP address listed next.
127.0.0.1
192.168.0.1
An IPv4 address must consist of numbers ranging from 0 to 255, arranged in four groups separated by the period (.) character.
In IPv6, you are not required to write the leading zeros in an individual field (between the colons). However; there must be at least one numeral in every field, except as noted next.
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![[spacer]](1p.gif)  Using :: to Abbreviate an Address
The :: syntax can only appear once in an Ipv6 address, and can also be used to compress the leading and/or trailing zeros in an address.
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The way it works is that the system
counts the number of fields that ARE present in the written address,
and subtracts that number from the maximum number of fields in an Ipv6
address (8), and automatically inserts the proper number of 0 fields
in place of the ::.
Examples of using the :: look like
this;
FF01:0:0:0:0:0:0:101 is
represented by FF01::101
0:0:0:0:0:0:0:1 is represented
by ::1
0:0:0:0:0:0:0:0 is represented
by ::
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