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<registry xmlns="http://www.iana.org/assignments" id="ipv6-address-space">
  <title>Internet Protocol Version 6 Address Space</title>
  <updated>2019-09-13</updated>
  <note>The IPv6 address management function was formally delegated to
IANA in December 1995 <xref type="rfc" data="rfc1881"/>. The registration procedure
was confirmed with the IETF Chair in March 2010.

As stated in RFC3513, IANA should limit its allocation of IPv6-unicast 
address space to the range of addresses that start with binary value 001.
The rest of the global unicast address space (approximately 85% of the IPv6
address space) is reserved for future definition and use, and is not to be
assigned by IANA at this time.
        
While <xref type="rfc" data="rfc3513"/> was obsoleted by <xref type="rfc" data="rfc4291"/>,
the guidiance provided to IANA did not change regarding the allocation of IPv6 
unicast addresses.
        
  </note>
<registry id="ipv6-address-space-1">
  <registration_rule>IESG Approval</registration_rule>
  <record>
    <prefix>0000::/8</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes>
    <xref type="note" data="1"/>
    <xref type="note" data="2"/>
    <xref type="note" data="3"/>
    <xref type="note" data="4"/>
    <xref type="note" data="5"/>
    <xref type="note" data="6"/>
    </notes>
  </record>
  <record>
    <prefix>0100::/8</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes>0100::/64 reserved for Discard-Only Address Block <xref type="rfc" data="rfc6666"/>. 
Complete registration details are found in <xref type="registry" data="iana-ipv6-special-registry"/>.</notes>
  </record>
  <record>
    <prefix>0200::/7</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc4048"/>
    <notes>Deprecated as of December 2004 <xref type="rfc" data="rfc4048"/>. 
Formerly an OSI NSAP-mapped prefix set <xref type="rfc" data="rfc4548"/>.</notes>
  </record>
  <record>
    <prefix>0400::/6</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>0800::/5</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>1000::/4</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>2000::/3</prefix>
    <description>Global Unicast</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes>The IPv6 Unicast space encompasses the entire IPv6 address range 
with the exception of ff00::/8, per <xref type="rfc" data="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 <xref type="registry" data="ipv6-unicast-address-assignments"/>.
      <xref type="note" data="7"/>    
      <xref type="note" data="8"/>    
      <xref type="note" data="9"/>      
      <xref type="note" data="10"/>      
      <xref type="note" data="11"/>      
      <xref type="note" data="12"/>
      <xref type="note" data="13"/>
      <xref type="note" data="14"/>
      <xref type="note" data="15"/>
    </notes>
  </record>
  <record>
    <prefix>4000::/3</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>6000::/3</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>8000::/3</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>a000::/3</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>c000::/3</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>e000::/4</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>f000::/5</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>f800::/6</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>fc00::/7</prefix>
    <description>Unique Local Unicast</description>
    <xref type="rfc" data="rfc4193"/>
    <notes>For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</notes>
  </record>
  <record>
    <prefix>fe00::/9</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes/>
  </record>
  <record>
    <prefix>fe80::/10</prefix>
    <description>Link-Scoped Unicast</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes>Reserved by protocol. For authoritative registration, see <xref type="registry" data="iana-ipv6-special-registry"/>.</notes>
  </record>
  <record>
    <prefix>fec0::/10</prefix>
    <description>Reserved by IETF</description>
    <xref type="rfc" data="rfc3879"/>
    <notes>Deprecated by <xref type="rfc" data="rfc3879"/> in September 2004. Formerly a Site-Local scoped address prefix.</notes>
  </record>
  <record>
    <prefix>ff00::/8</prefix>
    <description>Multicast</description>
    <xref type="rfc" data="rfc3513"/><xref type="rfc" data="rfc4291"/>
    <notes>IANA assignments from this block are registered in <xref type="registry" data="ipv6-multicast-addresses"/>.</notes>
  </record>
  <footnote anchor="1">::1/128 reserved for Loopback Address <xref type="rfc" data="rfc4291"/>. 
Reserved by protocol. For authoritative registration, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>
  <footnote anchor="2">::/128 reserved for Unspecified Address <xref type="rfc" data="rfc4291"/>. 
Reserved by protocol. For authoritative registration, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>
  <footnote anchor="3">::ffff:0:0/96 reserved for IPv4-mapped Address <xref type="rfc" data="rfc4291"/>. 
Reserved by protocol. For authoritative registration, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>
  <footnote anchor="4">0::/96 deprecated by <xref type="rfc" data="rfc4291"/>. Formerly defined as the "IPv4-compatible IPv6 address" prefix.</footnote>
  <footnote anchor="5">The "Well Known Prefix" 64:ff9b::/96 is used in an algorithmic mapping between IPv4 to IPv6 addresses <xref type="rfc" data="rfc6052"/>.</footnote>  
  <footnote anchor="6">64:ff9b:1::/48 reserved for Local-Use IPv4/IPv6 Translation <xref type="rfc" data="rfc8215"/>.</footnote>
  <footnote anchor="7">2001:0::/23 reserved for IETF Protocol Assignments <xref type="rfc" data="rfc2928"/>. 
For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>  
  <footnote anchor="8">2001:0::/32 reserved for TEREDO <xref type="rfc" data="rfc4380"/>. 
For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>  
  <footnote anchor="9">2001:2::/48 reserved for Benchmarking <xref type="rfc" data="rfc5180"/><xref type="rfc-errata" data="1752"/>. 
For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>  
  <footnote anchor="10">2001:3::/32 reserved for AMT <xref type="rfc" data="rfc7450"/>. 
For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>  
  <footnote anchor="11">2001:4:112::/48 reserved for AS112-v6 <xref type="rfc" data="rfc7535"/>. 
For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>     
  <footnote anchor="12">2001:10::/28 deprecated (formerly ORCHID) <xref type="rfc" data="rfc4843"/>. 
For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>  
  <footnote anchor="13">2001:20::/28 reserved for ORCHIDv2 <xref type="rfc" data="rfc7343"/>.
For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>
  <footnote anchor="14">2001:db8::/32 reserved for Documentation <xref type="rfc" data="rfc3849"/>. 
For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>
  <footnote anchor="15">2002::/16 reserved for 6to4 <xref type="rfc" data="rfc3056"/>. 
For complete registration details, see <xref type="registry" data="iana-ipv6-special-registry"/>.</footnote>


  <people/>
</registry>
 </registry>