2012-06-20 The IPv6 address management function was formally delegated to IANA in December 1995 . The registration procedure was confirmed with the IETF Chair in March 2010. IESG Approval 0000::/8 Reserved by IETF 0100::/8 Reserved by IETF 0200::/7 Reserved by IETF 0400::/6 Reserved by IETF 0800::/5 Reserved by IETF 1000::/4 Reserved by IETF 2000::/3 Global Unicast 4000::/3 Reserved by IETF 6000::/3 Reserved by IETF 8000::/3 Reserved by IETF A000::/3 Reserved by IETF C000::/3 Reserved by IETF E000::/4 Reserved by IETF F000::/5 Reserved by IETF F800::/6 Reserved by IETF FC00::/7 Unique Local Unicast FE00::/9 Reserved by IETF FE80::/10 Link Local Unicast FEC0::/10 Reserved by IETF FF00::/8 Multicast The "unspecified address", the "loopback address", and the IPv6 Addresses with Embedded IPv4 Addresses are assigned out of the 0000::/8 address block. 0200::/7 was previously defined as an OSI NSAP-mapped prefix set . This definition has been deprecated as of December 2004 . The IPv6 Unicast space encompasses the entire IPv6 address range with the exception of FF00::/8. IANA unicast address assignments are currently limited to the IPv6 unicast address range of 2000::/3. IANA assignments from this block are registered in the IANA registry: . FEC0::/10 was previously defined as a Site-Local scoped address prefix. This definition has been deprecated as of September 2004 . 0000::/96 was previously defined as the "IPv4-compatible IPv6 address" prefix. This definition has been deprecated by . The "Well Known Prefix" 64:ff9b::/96 used in an algorithmic mapping between IPv4 to IPv6 addresses is defined out of the 0000::/8 address block, per . IANA assignments from this block are registered in the IPv6 Multicast Address Space Registry: . 0100::/64 is assigned as a Discard-Only Prefix for remote triggered blackhole routing as per .