18.1.3 Format prefix in the addresses
A 128-bit IPv6 address is divided into subfields. The first bits are called the address format prefix and identify the type of the IPv6 address. The following figure shows an example of an address format prefix.
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![[Figure Data]](./GRAPHICS/ZU315040.GIF)
The following table describes the types of address format prefixes.
|
Prefix (binary) |
Assignment |
|---|---|
|
0000 0000 |
Unassigned |
|
0000 0001 |
Unassigned |
|
0000 001 |
Unassigned |
|
0000 010 |
Unassigned |
|
0000 011 |
Unassigned |
|
0000 1 |
Unassigned |
|
0001 |
Unassigned |
|
001 |
Aggregation-possible global unicast addresses |
|
010 |
Unassigned |
|
011 |
Unassigned |
|
100 |
Unassigned |
|
101 |
Unassigned |
|
110 |
Unassigned |
|
1110 |
Unassigned |
|
1111 0 |
Unassigned |
|
1111 10 |
Unassigned |
|
1111 110 |
Unique Unicast Address |
|
1111 1110 0 |
Unassigned |
|
1111 1110 10 |
Link-local unicast addresses |
|
1111 1110 11 |
Unassigned |
|
1111 1111 |
Multicast addresses |