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<registry xmlns="http://www.iana.org/assignments" id="ipv6-anycast-addresses">
  <title>IPv6 Anycast Address Space</title>
  <updated>2025-10-09</updated>
  <registry id="ipv6-anycast-addresses-1">
    <title>IPv6 Anycast Address Space</title>
    <xref type="rfc" data="rfc4291"/>
    <xref type="rfc" data="rfc2526"/>
    <registration_rule>IESG Approval</registration_rule>
    <note>IPv6 anycast addresses are defined in "IP Version 6 Addressing
Architecture" <xref type="rfc" data="rfc4291"/>. <xref type="rfc" data="rfc2526"/> further defines a set of
reserved subnet anycast addresses. These are the highest 128
interface identifier values, within each subnet.  The syntax
and rules for assigning new IPv6 reserved subnet anycast addresses
are defined in <xref type="rfc" data="rfc2526"/>.  These addresses are assigned in descending
order.</note>
<note title="Formerly known as">Internet Protocol Version 6 (IPv6) Anycast Addresses</note>
    <record>
      <decimal>127</decimal>
      <hexadecimal>0x7F</hexadecimal>
      <description>Reserved</description>
    </record>
    <record>
      <decimal>126</decimal>
      <hexadecimal>0x7E</hexadecimal>
      <description>Mobile IPv6 Home-Agents anycast</description>
      <xref type="rfc" data="rfc2526"/>
      <note>Also see <xref type="rfc" data="rfc3775"/></note>
    </record>
    <record date="2014-05-16">
      <decimal>125</decimal>
      <hexadecimal>0x7D</hexadecimal>
      <description>IPv6 over GeoNetworking geographic anycast</description>
      <xref type="uri" data="http://www.etsi.org/deliver/etsi_en/302600_302699/3026360601/">ETSI EN 302 636-6-1</xref>
      <xref type="person" data="Martin_Arndt"/>
      <note>To be used for all published versions of <xref type="uri" data="http://www.etsi.org/deliver/etsi_en/302600_302699/3026360601/">ETSI EN 302 636-6-1</xref></note>
    </record>
    <record>
      <decimal>1-124</decimal>
      <hexadecimal>0x01-0x7D</hexadecimal>
      <description>Reserved</description>
    </record>
  </registry>
  
  <registry id="ipv6-anycast-addresses-2">
    <title>IPv6 Anycast Subnet-Router Anycast Address</title>
    <xref type="rfc" data="rfc4291"/>
    <registration_rule>IESG Approval</registration_rule>
    <record>
      <decimal>0</decimal>
      <hexadecimal>0x00</hexadecimal>
      <description>Subnet-Router Anycast Address</description>
      <xref type="rfc" data="rfc4291"/>
    </record>
  </registry>
  
  <people>
    <person id="Martin_Arndt">
      <name>Martin Arndt</name>
      <uri>mailto:Martin.Arndt&amp;etsi.org</uri>
      <updated>2014-05-16</updated>
    </person>
  </people>
</registry>
