The IPv6 address management function was formally delegated to IANA in December 1995 [RFC1881]. The registration procedure was confirmed with the IETF Chair in March 2010.
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The IPv6 address management function was formally delegated to IANA in December 1995 [RFC1881]. The registration procedure was confirmed with the IETF Chair in March 2010.
IESG Approval
| IPv6 Prefix | Allocation | Reference | Notes |
|---|---|---|---|
| 0000::/8 | Reserved by IETF | [RFC4291] | [1] [2] [3] [4] [5] [6] |
| 0100::/8 | Reserved by IETF | [RFC4291] | 0100::/64 reserved for Discard-Only Address Block [RFC6666]. Complete registration details are found in [IANA registry iana-ipv6-special-registry]. |
| 0200::/7 | Reserved by IETF | [RFC4048] | Deprecated as of December 2004 [RFC4048]. Formerly an OSI NSAP-mapped prefix set [RFC4548]. |
| 0400::/6 | Reserved by IETF | [RFC4291] | |
| 0800::/5 | Reserved by IETF | [RFC4291] | |
| 1000::/4 | Reserved by IETF | [RFC4291] | |
| 2000::/3 | Global Unicast | [RFC4291] | The IPv6 Unicast space encompasses the entire IPv6 address range with the exception of ff00::/8, per [RFC4291]. IANA unicast address assignments are currently limited to the IPv6 unicast address range of 2000::/3. IANA assignments from this block are registered in [IANA registry ipv6-unicast-address-assignments]. [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] |
| 4000::/3 | Reserved by IETF | [RFC4291] | |
| 6000::/3 | Reserved by IETF | [RFC4291] | |
| 8000::/3 | Reserved by IETF | [RFC4291] | |
| a000::/3 | Reserved by IETF | [RFC4291] | |
| c000::/3 | Reserved by IETF | [RFC4291] | |
| e000::/4 | Reserved by IETF | [RFC4291] | |
| f000::/5 | Reserved by IETF | [RFC4291] | |
| f800::/6 | Reserved by IETF | [RFC4291] | |
| fc00::/7 | Unique Local Unicast | [RFC4193] | For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| fe00::/9 | Reserved by IETF | [RFC4291] | |
| fe80::/10 | Link-Scoped Unicast | [RFC4291] | Reserved by protocol. For authoritative registration, see [IANA registry iana-ipv6-special-registry]. |
| fec0::/10 | Reserved by IETF | [RFC3879] | Deprecated by [RFC3879] in September 2004. Formerly a Site-Local scoped address prefix. |
| ff00::/8 | Multicast | [RFC4291] | IANA assignments from this block are registered in [IANA registry ipv6-multicast-addresses]. |
| [1] |
::1/128 reserved for Loopback Address [RFC4291]. Reserved by protocol. For authoritative registration, see [IANA registry iana-ipv6-special-registry]. |
| [2] |
::/128 reserved for Unspecified Address [RFC4291]. Reserved by protocol. For authoritative registration, see [IANA registry iana-ipv6-special-registry]. |
| [3] |
::ffff:0:0/96 reserved for IPv4-mapped Address [RFC4291]. Reserved by protocol. For authoritative registration, see [IANA registry iana-ipv6-special-registry]. |
| [4] |
0000::/96 deprecated by [RFC4291]. Formerly defined as the "IPv4-compatible IPv6 address" prefix. |
| [5] |
The "Well Known Prefix" 64:ff9b::/96 is used in an algorithmic mapping between IPv4 to IPv6 addresses [RFC6052]. |
| [6] |
64:ff9b:1::/48 reserved for Local-Use IPv4/IPv6 Translation [RFC8215]. |
| [7] |
2001:0000::/23 reserved for IETF Protocol Assignments [RFC2928]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| [8] |
2001:0000::/32 reserved for TEREDO [RFC4380]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| [9] |
2001:0002::/48 reserved for Benchmarking [RFC5180][RFC Errata 1752]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| [10] |
2001:3::/32 reserved for AMT [RFC7450]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| [11] |
2001:4:112::/48 reserved for AS112-v6 [RFC7535]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| [12] |
2001:5::/32 reserved for EID Space for LISP [RFC7954]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| [13] |
2001:10::/28 deprecated (formerly ORCHID) [RFC4843]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| [14] |
2001:20::/28 reserved for ORCHIDv2 [RFC7343]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| [15] |
2001:db8::/32 reserved for Documentation [RFC3849]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |
| [16] |
2002::/16 reserved for 6to4 [RFC3056]. For complete registration details, see [IANA registry iana-ipv6-special-registry]. |