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The site prefix, the subnet ID, and the interface ID are the three elements of an IPv6 address. The position of the bits within the address distinguishes these three components.

An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits The groups are separated by colons (:). An example of an IPv6 address is: 2001:0db8:85a3:0000:0000:8a2e:0370:7334. The standards provide flexibility in the representation of IPv6 addresses.

An IPv6 address is 128 bits long and is divided into eight 16-bit fields, each separated by a colon. In contrast to IPv4 addresses, which use dotted-decimal format, each field must include a hexadecimal number. The x's in the following diagram indicate hexadecimal numbers.

An IPv6 address is 128 bits long and divided into eight groups, each of which is 16 bits long. The groups are separated by colons and each is expressed as four hexadecimal digits. The network and node components of an IPv6 address are separated.

There must be six segments in the IPv6 section of the address, but there is a short form notation for segments that are zero. The octet in the IPv4 component of the address must be a decimal number between 0 and 255.

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