Internet Protocol version 6 (IPv6) Global Unicast Allocations 2006-01-10 2025-10-09 IETF Review Address prefixes listed in the Special-Purpose Address Registry are not guaranteed routability in any particular local or global context. The IPv4 and IPv6 Special-Purpose Address Registries maintain the following information regarding each entry: o Address Block - A block of IPv4 or IPv6 addresses that has been registered for a special purpose. o Name - A descriptive name for the special-purpose address block. o RFC - The RFC through which the special-purpose address block was requested. o Allocation Date - The date upon which the special-purpose address block was allocated. o Termination Date - The date upon which the allocation is to be terminated. This field is applicable for limited-use allocations only. o Source - A boolean value indicating whether an address from the allocated special-purpose address block is valid when used as the source address of an IP datagram that transits two devices. o Destination - A boolean value indicating whether an address from the allocated special-purpose address block is valid when used as the destination address of an IP datagram that transits two devices. o Forwardable - A boolean value indicating whether a router may forward an IP datagram whose destination address is drawn from the allocated special-purpose address block between external interfaces. o Globally Reachable - A boolean value indicating whether an IP datagram whose destination address is drawn from the allocated special-purpose address block is forwardable beyond a specified administrative domain. o Reserved-by-Protocol - A boolean value indicating whether the special-purpose address block is reserved by IP, itself. This value is "TRUE" if the RFC that created the special-purpose address block requires all compliant IP implementations to behave in a special way when processing packets either to or from addresses contained by the address block. If the value of "Destination" is FALSE, the values of "Forwardable" and "Globally Reachable" must also be false. IANA IPv6 Special-Purpose Address Registry (pursuant to IESG decision)

::1/128

Loopback Address 2006-02 False False False False True

::/128

Unspecified Address 2006-02 True False False False True

::ffff:0:0/96

IPv4-mapped Address 2006-02 False False False False True

64:ff9b::/96

IPv4-IPv6 Translat. 2010-10 True True True True False

64:ff9b:1::/48

IPv4-IPv6 Translat. 2017-06 True True True False False

100::/64

Discard-Only Address Block 2012-06 True True True False False

100:0:0:1::/64

Dummy IPv6 Prefix 2025-04 True False False False False

2001::/23

IETF Protocol Assignments 2000-09 False False False False False

2001::/32

TEREDO 2006-01 True True True N/A False

2001:1::1/128

Port Control Protocol Anycast 2015-10 True True True True False

2001:1::2/128

Traversal Using Relays around NAT Anycast 2017-02 True True True True False

2001:1::3/128

DNS-SD Service Registration Protocol Anycast 2024-04 True True True True False

2001:2::/48

Benchmarking 2008-04 True True True False False

2001:3::/32

AMT 2014-12 True True True True False

2001:4:112::/48

AS112-v6 2014-12 True True True True False

2001:10::/28

Deprecated (previously ORCHID) 2007-03 2014-03

2001:20::/28

ORCHIDv2 2014-07 True True True True False

2001:30::/28

Drone Remote ID Protocol Entity Tags (DETs) Prefix 2022-12 True True True True False

2001:db8::/32

Documentation 2004-07 False False False False False

2002::/16

6to4 2001-02 True True True N/A False

2620:4f:8000::/48

Direct Delegation AS112 Service 2011-05 True True True True False

3fff::/20

Documentation 2024-07 False False False False False

5f00::/16

Segment Routing (SRv6) SIDs 2024-04 True True True False False

fc00::/7

Unique-Local 2005-10 True True True False False

fe80::/10

Link-Local Unicast 2006-02 True True False False True Unless allowed by a more specific allocation. See Section 5 of for details. See for details. See for more details on the routability of Unique-Local addresses. The Unique-Local prefix is drawn from the IPv6 Global Unicast Address range, but is specified as not globally routed.