brolz.blogg.se - Ipv6 address compression rules

The basic relationship table of binary, decimal, and hexadecimal is following. If we convert one hextet into binary it should be 16 bits, for example, we have a hextet “0000” it is equal to 0000000000000000 (16 time 0s) and hextet “ FFFF” is equal to 1111111111111111 (16 tim1 1s).

So each “x” is a single hextet, 16 bits or four hexadecimal digits. The preferred format for writing an IPv6 address is x: x: x: x: x: x: x: x, where each “x” is the group of four hexadecimal digits and each group contains 16 bits. The address can be written both lowercase or in uppercase. For example, 2001:db8::1 is preferred over 2001:DB8::1.The length of IPv6 addresses are 128 bits and represented as eight groups of four hexadecimal digits each, each group representing 16 bits.

Hexadecimal digits are expressed as lower-case letters.

If there are multiple longest runs of all-zero fields, then it is the leftmost that is compressed. The longest sequence of consecutive all-zero fields is replaced with double-colon.

Representations are shortened as much as possible.

"::" is not used to shorten just a single 0 field.

For example, 2001:0db8::0001 is rendered as 2001:db8::1, though any all-zero field that is explicitly presented is rendered as 0.

Leading zeros in each 16-bit field are suppressed.

To mitigate these problems, a canonical format is defined for rendering IPv6 addresses in text: However, this also complicates several common operations: searching for a specific address in a text file or stream, and comparing two addresses to determine their equivalence.

In an attempt to simplify IPv6 addresses, the standards provide flexibility in their representation. This calculator will compress or decompress an IPv6 address.