IPv6 Address Format

1. IPv6 Address Format
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2.  Unlike IPv4, which uses a dotted-decimal format with each
byte ranges from 0 to 255, IPv6 uses eight groups of four
hexadecimal digits separated by colons.
For example, this is a valid IPv6 address:
 2340:0023:AABA:0A01:0055:5054:9ABC:ABB0

3. Hex Binary Hex Binary
0 0000 8 1000
1 0001 9 1001
2 0010 A 1010
3 0011 B 1011
4 0100 C 1100
5 0101 D 1101
6 0110 E 1110
7 0111 F 1111

4.  IPv6 address shortening
 The IPv6 address given above looks daunting, right? Well,
there are two conventions that can help you shorten what
must be typed for an IP address:
1. a leading zero can be omitted
For example, the address mentioned above
(2340:0023:AABA:0A01:0055:5054:9ABC:ABB0) could be
shorten to2340:23:AABA:A01:55:5054:9ABC:ABB0

5. 2. successive fields of zeroes can be represented as two
colons (::)
For
example, 2340:0000:0000:0000:0455:0000:AAAB:1121 can
be written as2340::0455:0000:AAAB:1121
 NOTE – you can shorten an address this way only for one
such occurrence. The reason is obvious – if you had more
than occurrence of double colon you wouldn't know how
many sets of zeroes were being omitted from each part.

6. Here is a couple of more examples that can help you
grasp the concept:
 Long version: 1454:0045:0000:0000:4140:0141:0055:ABBB
Shortened version: 1454:45::4140:141:55:ABBB
 Long
version: 0000:0000:0001:AAAA:BBBC:A222:BBBA:0001
Shortened version: ::1:AAAA:BBBC:A222:BBBA:1