| Value | Defined by | Name | Description | References |
|---|---|---|---|---|
| ::/8 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| 100::/8 | IANA | Reserved by IETF | 0100::/64 reserved for Discard-Only Address Block RFC 6666. Complete registration details are found in IPv6: Special-Purpose Address Registry. |
RFC 3513, RFC 4291, RFC 6666 |
| 200::/7 | IANA | Reserved by IETF | Deprecated as of December 2004 RFC 4048. Formerly an OSI NSAP-mapped prefix set RFC 4548. |
RFC 4048, RFC 4548 |
| 400::/6 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| 800::/5 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| 1000::/4 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| 2000::/3 | IANA | Global Unicast | The IPv6 Unicast space encompasses the entire IPv6 address range with the exception of ff00::/8, per RFC 4291. IANA unicast address assignments are currently limited to the IPv6 unicast address range of 2000::/3. IANA assignments from this block are registered in IPv6: Global Unicast Address Assignments. |
RFC 3513, RFC 4291 |
| 4000::/3 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| 6000::/3 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| 8000::/3 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| a000::/3 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| c000::/3 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| e000::/4 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| f000::/5 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| f800::/6 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| fc00::/7 | IANA | Unique Local Unicast | For complete registration details, see IPv6: Special-Purpose Address Registry. | RFC 4193 |
| fe00::/9 | IANA | Reserved by IETF | - | RFC 3513, RFC 4291 |
| fe80::/10 | IANA | Link-Scoped Unicast | Reserved by protocol. For authoritative registration, see IPv6: Special-Purpose Address Registry. | RFC 3513, RFC 4291 |
| fec0::/10 | IANA | Reserved by IETF | Deprecated by RFC 3879 in September 2004. Formerly a Site-Local scoped address prefix. | RFC 3879 |
| ff00::/8 | IANA | Multicast | IANA assignments from this block are registered in ipv6-multicast-addresses. | RFC 3513, RFC 4291 |