Build from 8x four-digit HEX number
1111:2222:3333:4444:5555:6666:7777:8888

2^128 Numbers 54'525'952 Numbers / m2 earth surface. As they are split in ranges for different purpose the real number is much less.

Global

001 T TTTTT TTTTT TTTTT : RRRR RRRR NNNN NNNN : NNNN -NNNN : SSSS - SSSS : IIII - : : : - IIII 

001 = FP
T = TLA ID
R = Reserve
N = NLA ID
S = SLA ID
I = Interface ID

Link-Local (FE80:…)

Is about what APIPA is in IPv4

1111 1110 1000 0000 : 0 : 0 : 0 :  : IIII - : : : - IIII 

FE80:: Interface ID

Site-Local (FE60:…)

Is equal to IPv4 Privat ranges

1111 1110 0110 0000: 0 : 0: SSSS SSSS SSSS SSSS : 0 : IIII - : : - IIII 

FE60:0:0:Site:0:Interface ID

Special

0:0:0:0:0:0:0:0:0 = :: = 0:0:0:0

0:0:0:0:0:0:0:0:1 = ::1 = 127.0.0.1 = loopback interface

0000 001 …… NSAP Address map 0000 010 …… IPX Address map

Construct (FF…)

xxxx xxxx FFFF SSSS : Group ID X = FP = 1111 1111 = FF F= Flag S = Scope

Scope

0 = Reserve 1 = Node-local Scope 2 = Link-Local Scope 5 = Site-Local Scope 8 = Organization-Local Scope e = Global Scope f = Reserved

Example

FE80::6b:28c:16D2:c97  = Host IPv6 Address
FF02::     1:FF00:0 /104 = to process all Link-local hosts of the last 24 Bit Hosts
FF02::     1:FFD2:C97  = Corresponding solicited-node Address

Bit net mask help

16:32:48:64:80:96  :  100 104 108 112  :   116 120 124 128

They are currently only assigned to routers

IPv4 Mapped Address (0:0:0:0..)

The following address would be encapsulated in IPv4 and sent o the destination using IPv4 0:0:0:0:0:0:W:X:Y:Z W:X:Y:Z = IPv4

Teredo (2001:0:…)

2001:0:TTTT:TTTT:FFFF:UUUU:IIII:IIII 2001:0: = Teredo Prefix T = Teredo Server IP F = Flag U = UDP Port I = Host IP XOR converted To get the contained Host IP

1. Xor the IP Part
0123456789ABCDEF     Hex in Teredo Number
to
FEDCBA9876543210      Xor Result

F5 FF:9B FE  = IP in Teredo string
0A 00:64 01  = converted XOR in HEX
10.0.100.1   = IP Number Dezimal

F5.. .... = 10...
53.. .... = 172...
3F57 .... = 192.168..
5601 .... = 169.254..