The first few bits of an IPv6 address which tell a host what kind of address it is.
| 0000 0000 | Used for things like IPv6 compatible IPv4, loopback and unspecified addresses (1/256th of the address space) |
| 001 | Aggregatable Global Unicast Addresses (1/8 of the address space) |
| 1111 1110 10 | Link-Local Unicast Addresses (1/2024 of the address space) |
| 1111 1110 11 | Site-Local Unicast Addresses (1/2024 of the address space) |
| 1111 1111 | Multicast Addresses (1/256 of the address space) |
Almost all the other address space is unallocated or reserved.
See [IPv6Addressing?] for more information.
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