CINXE.COM
Internet Protocol Version 6 (IPv6) Parameters
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:iana="http://www.iana.org/assignments"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <link rel="stylesheet" href="../_support/iana-registry.css" type="text/css" /> <script type="text/javascript" src="../_support/jquery.js"></script> <script type="text/javascript" src="../_support/sort.js"></script> <title>Internet Protocol Version 6 (IPv6) Parameters</title> </head> <body> <header> <div> <a href="/"> <img src="https://www.iana.org/_img/2022/iana-logo-header.svg" alt="Internet Assigned Numbers Authority" /> </a> </div> </header> <article> <h1>Internet Protocol Version 6 (IPv6) Parameters</h1> <dl> <dt>Last Updated</dt> <dd>2024-12-20</dd> <dt>Available Formats</dt> <dd> <a class="altformat" href="ipv6-parameters.xml"><img src="/_img/icons/text-xml.png" /><br />XML</a> <a class="altformat" href="ipv6-parameters.xhtml"><img src="/_img/icons/text-html.png" /><br />HTML</a> <a class="altformat" href="ipv6-parameters.txt"><img src="/_img/icons/text-plain.png" /><br />Plain text</a> </dd> </dl> <p> <b>Registries included below</b> </p> <ul> <li> <a href="#ipv6-parameters-1">Next Header Types</a> </li> <li> <a href="#extension-header">IPv6 Extension Header Types</a> </li> <li> <a href="#ipv6-parameters-2">Destination Options and Hop-by-Hop Options</a> </li> <li> <a href="#ipv6-parameters-3">Routing Types</a> </li> <li> <a href="#rpl-option-tlv">RPL-option-TLV</a> </li> <li> <a href="#taggerId-types">TaggerId Types</a> </li> <li> <a href="#segment-routing-header-flags">Segment Routing Header Flags</a> </li> <li> <a href="#segment-routing-header-tlvs">Segment Routing Header TLVs</a> </li> </ul> <h2><a name="ipv6-parameters-1" id="ipv6-parameters-1"></a>Next Header Types</h2> <dl> <dt>Reference</dt> <dd>[<a href="https://www.iana.org/go/rfc8200">RFC8200</a>][<a href="https://www.iana.org/go/rfc2780">RFC2780</a>][<a href="https://www.iana.org/go/rfc7045">RFC7045</a>]</dd> <dt>Note</dt> <dd> <pre>This registry has been closed in favor of the IPv6 Extension Header Types registry, also located at [<a href="https://www.iana.org/assignments/ipv6-parameters">IANA registry <i>ipv6-parameters</i></a>]. </pre> </dd> </dl> <h2><a name="extension-header" id="extension-header"></a>IPv6 Extension Header Types</h2> <dl> <dt>Registration Procedure(s)</dt> <dd> <pre>Standards Action or IESG Approval</pre> </dd> <dt>Reference</dt> <dd>[<a href="https://www.iana.org/go/rfc2780">RFC2780</a>][<a href="https://www.iana.org/go/rfc5237">RFC5237</a>][<a href="https://www.iana.org/go/rfc7045">RFC7045</a>]</dd> <dt>Note</dt> <dd> <pre>The "IPv6 Extension Header" field in the Assigned Internet Protocol Numbers registry at [<a href="https://www.iana.org/assignments/protocol-numbers">IANA registry <i>protocol-numbers</i></a>] should be updated for any Protocol Number added to this registry. </pre> </dd> <dt>Note</dt> <dd> <pre>When a new code is assigned to an IPv6 Extension Header, the next available free bit in [<a href="https://www.iana.org/assignments/ipfix/ipfix.xhtml#ipfix-ipv6extensionheaders-bits">IPFIX ipv6ExtensionHeaders Bits</a>] is selected for this new Extension Header. [<a href="https://www.iana.org/assignments/ipfix/ipfix.xhtml#ipfix-ipv6extensionheaders-bits">IPFIX ipv6ExtensionHeaders Bits</a>] is updated accordingly. Modifications to existing registrations must be mirrored in [<a href="https://www.iana.org/assignments/ipfix/ipfix.xhtml#ipfix-ipv6extensionheaders-bits">IPFIX ipv6ExtensionHeaders Bits</a>]. </pre> </dd> <dt>Available Formats</dt> <dd> <a class="altformat" href="extension-header.csv"><img src="/_img/icons/text-csv.png" /><br />CSV</a> </dd> </dl> <table id="table-extension-header" class="sortable"> <thead> <tr> <th>Protocol Number</th> <th>Description</th> <th>Reference</th> </tr> </thead> <tbody> <tr> <td align="center">0</td> <td>IPv6 Hop-by-Hop Option</td> <td>[<a href="https://www.iana.org/go/rfc8200">RFC8200</a>]</td> </tr> <tr> <td align="center">43</td> <td>Routing Header for IPv6</td> <td>[<a href="https://www.iana.org/go/rfc8200">RFC8200</a>][<a href="https://www.iana.org/go/rfc5095">RFC5095</a>]</td> </tr> <tr> <td align="center">44</td> <td>Fragment Header for IPv6</td> <td>[<a href="https://www.iana.org/go/rfc8200">RFC8200</a>]</td> </tr> <tr> <td align="center">50</td> <td>Encapsulating Security Payload</td> <td>[<a href="https://www.iana.org/go/rfc4303">RFC4303</a>]</td> </tr> <tr> <td align="center">51</td> <td>Authentication Header</td> <td>[<a href="https://www.iana.org/go/rfc4302">RFC4302</a>]</td> </tr> <tr> <td align="center">60</td> <td>Destination Options for IPv6</td> <td>[<a href="https://www.iana.org/go/rfc8200">RFC8200</a>]</td> </tr> <tr> <td align="center">135</td> <td>Mobility Header</td> <td>[<a href="https://www.iana.org/go/rfc6275">RFC6275</a>]</td> </tr> <tr> <td align="center">139</td> <td>Host Identity Protocol</td> <td>[<a href="https://www.iana.org/go/rfc7401">RFC7401</a>]</td> </tr> <tr> <td align="center">140</td> <td>Shim6 Protocol</td> <td>[<a href="https://www.iana.org/go/rfc5533">RFC5533</a>]</td> </tr> <tr> <td align="center">253</td> <td>Use for experimentation and testing</td> <td>[<a href="https://www.iana.org/go/rfc3692">RFC3692</a>][<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">254</td> <td>Use for experimentation and testing</td> <td>[<a href="https://www.iana.org/go/rfc3692">RFC3692</a>][<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> </tbody> </table> <h2><a name="ipv6-parameters-2" id="ipv6-parameters-2"></a>Destination Options and Hop-by-Hop Options</h2> <dl> <dt>Registration Procedure(s)</dt> <dd> <pre>IESG Approval, IETF Review or Standards Action</pre> </dd> <dt>Reference</dt> <dd>[<a href="https://www.iana.org/go/rfc8200">RFC8200</a>][<a href="https://www.iana.org/go/rfc2780">RFC2780</a>][<a href="https://www.iana.org/go/rfc9673">RFC9673</a>]</dd> <dt>Note</dt> <dd> <pre>From [<a href="https://www.iana.org/go/rfc8200">RFC8200</a>] IPv6 Option Types are 8-bit values, structured as three subfields, are defined in Section 4.2 of [<a href="https://www.iana.org/go/rfc8200">RFC8200</a>]. Each distinct 8-bit Option Type identifies a different option, i.e., the high-order 3 bits are considered part of the option identification. However, it is recommended that Option Types be assigned with distinct values in the "rest" subfield, until and unless that 5-bit space becomes full. </pre> </dd> <dt>Available Formats</dt> <dd> <a class="altformat" href="ipv6-parameters-2.csv"><img src="/_img/icons/text-csv.png" /><br />CSV</a> </dd> </dl> <table id="table-ipv6-parameters-2" class="sortable"> <thead> <tr> <th rowspan="2">Hex Value</th> <th colspan="3">Binary Value</th> <th rowspan="2">Description</th> <th rowspan="2">Reference</th> </tr> <tr> <th>act</th> <th>chg</th> <th>rest</th> </tr> </thead> <tbody> <tr> <td align="center">0x00</td> <td align="center">00</td> <td align="center">0</td> <td align="center">00000</td> <td>Pad1</td> <td>[<a href="https://www.iana.org/go/rfc2460">RFC2460</a>]</td> </tr> <tr> <td align="center">0x01</td> <td align="center">00</td> <td align="center">0</td> <td align="center">00001</td> <td>PadN</td> <td>[<a href="https://www.iana.org/go/rfc2460">RFC2460</a>]</td> </tr> <tr> <td align="center">0xC2</td> <td align="center">11</td> <td align="center">0</td> <td align="center">00010</td> <td>Jumbo Payload</td> <td>[<a href="https://www.iana.org/go/rfc2675">RFC2675</a>]</td> </tr> <tr> <td align="center">0x23</td> <td align="center">00</td> <td align="center">1</td> <td align="center">00011</td> <td>RPL Option</td> <td>[<a href="https://www.iana.org/go/rfc9008">RFC9008</a>]</td> </tr> <tr> <td align="center">0x63</td> <td align="center">01</td> <td align="center">1</td> <td align="center">00011</td> <td>RPL Option (DEPRECATED)</td> <td>[<a href="https://www.iana.org/go/rfc6553">RFC6553</a>][<a href="https://www.iana.org/go/rfc9008">RFC9008</a>]</td> </tr> <tr> <td align="center">0x04</td> <td align="center">00</td> <td align="center">0</td> <td align="center">00100</td> <td>Tunnel Encapsulation Limit</td> <td>[<a href="https://www.iana.org/go/rfc2473">RFC2473</a>]</td> </tr> <tr> <td align="center">0x05</td> <td align="center">00</td> <td align="center">0</td> <td align="center">00101</td> <td>Router Alert</td> <td>[<a href="https://www.iana.org/go/rfc2711">RFC2711</a>]</td> </tr> <tr> <td align="center">0x26</td> <td align="center">00</td> <td align="center">1</td> <td align="center">00110</td> <td>Quick-Start</td> <td>[<a href="https://www.iana.org/go/rfc4782">RFC4782</a>][<a href="http://www.rfc-editor.org/errata_search.php?eid=2034">RFC Errata 2034</a>]</td> </tr> <tr> <td align="center">0x07</td> <td align="center">00</td> <td align="center">0</td> <td align="center">00111</td> <td>CALIPSO</td> <td>[<a href="https://www.iana.org/go/rfc5570">RFC5570</a>]</td> </tr> <tr> <td align="center">0x08</td> <td align="center">00</td> <td align="center">0</td> <td align="center">01000</td> <td>SMF_DPD</td> <td>[<a href="https://www.iana.org/go/rfc6621">RFC6621</a>]</td> </tr> <tr> <td align="center">0xC9</td> <td align="center">11</td> <td align="center">0</td> <td align="center">01001</td> <td>Home Address</td> <td>[<a href="https://www.iana.org/go/rfc6275">RFC6275</a>]</td> </tr> <tr> <td align="center">0x8A</td> <td align="center">10</td> <td align="center">0</td> <td align="center">01010</td> <td>Endpoint Identification (DEPRECATED)</td> <td>[[CHARLES LYNN]]</td> </tr> <tr> <td align="center">0x8B</td> <td align="center">10</td> <td align="center">0</td> <td align="center">01011</td> <td>ILNP Nonce</td> <td>[<a href="https://www.iana.org/go/rfc6744">RFC6744</a>]</td> </tr> <tr> <td align="center">0x8C</td> <td align="center">10</td> <td align="center">0</td> <td align="center">01100</td> <td>Line-Identification Option</td> <td>[<a href="https://www.iana.org/go/rfc6788">RFC6788</a>]</td> </tr> <tr> <td align="center">0x4D</td> <td align="center">01</td> <td align="center">0</td> <td align="center">01101</td> <td>Deprecated</td> <td>[<a href="https://www.iana.org/go/rfc7731">RFC7731</a>]</td> </tr> <tr> <td align="center">0x6D</td> <td align="center">01</td> <td align="center">1</td> <td align="center">01101</td> <td>MPL Option</td> <td>[<a href="https://www.iana.org/go/rfc7731">RFC7731</a>]</td> </tr> <tr> <td align="center">0xEE</td> <td align="center">11</td> <td align="center">1</td> <td align="center">01110</td> <td>IP_DFF</td> <td>[<a href="https://www.iana.org/go/rfc6971">RFC6971</a>]</td> </tr> <tr> <td align="center">0x0F</td> <td align="center">00</td> <td align="center">0</td> <td align="center">01111</td> <td>Performance and Diagnostic Metrics (PDM)</td> <td>[<a href="https://www.iana.org/go/rfc8250">RFC8250</a>]</td> </tr> <tr> <td align="center">0x30</td> <td align="center">00</td> <td align="center">1</td> <td align="center">10000</td> <td>Minimum Path MTU Hop-by-Hop Option</td> <td>[<a href="https://www.iana.org/go/rfc9268">RFC9268</a>]</td> </tr> <tr> <td align="center">0x11</td> <td align="center">00</td> <td align="center">0</td> <td align="center">10001</td> <td>IOAM Destination Option and IOAM Hop-by-Hop Option</td> <td>[<a href="https://www.iana.org/go/rfc9486">RFC9486</a>]</td> </tr> <tr> <td align="center">0x31</td> <td align="center">00</td> <td align="center">1</td> <td align="center">10001</td> <td>IOAM Destination Option and IOAM Hop-by-Hop Option</td> <td>[<a href="https://www.iana.org/go/rfc9486">RFC9486</a>]</td> </tr> <tr> <td align="center">0x12</td> <td align="center">00</td> <td align="center">0</td> <td align="center">10010</td> <td>AltMark</td> <td>[<a href="https://www.iana.org/go/rfc9343">RFC9343</a>]</td> </tr> <tr> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center">10011-11101</td> <td>Unassigned</td> <td></td> </tr> <tr> <td align="center">0x1E</td> <td align="center">00</td> <td align="center">0</td> <td align="center">11110</td> <td>RFC3692-style Experiment [1]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">0x3E</td> <td align="center">00</td> <td align="center">1</td> <td align="center">11110</td> <td>RFC3692-style Experiment [1]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">0x5E</td> <td align="center">01</td> <td align="center">0</td> <td align="center">11110</td> <td>RFC3692-style Experiment [1]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">0x7E</td> <td align="center">01</td> <td align="center">1</td> <td align="center">11110</td> <td>RFC3692-style Experiment [1]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">0x9E</td> <td align="center">10</td> <td align="center">0</td> <td align="center">11110</td> <td>RFC3692-style Experiment [1]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">0xBE</td> <td align="center">10</td> <td align="center">1</td> <td align="center">11110</td> <td>RFC3692-style Experiment [1]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">0xDE</td> <td align="center">11</td> <td align="center">0</td> <td align="center">11110</td> <td>RFC3692-style Experiment [1]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">0xFE</td> <td align="center">11</td> <td align="center">1</td> <td align="center">11110</td> <td>RFC3692-style Experiment [1]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center"></td> <td align="center"></td> <td align="center"></td> <td align="center">11111</td> <td>Unassigned</td> <td></td> </tr> </tbody> </table> <h2><a name="ipv6-parameters-3" id="ipv6-parameters-3"></a>Routing Types</h2> <dl> <dt>Registration Procedure(s)</dt> <dd> <pre>IETF Review or IESG Approval</pre> </dd> <dt>Reference</dt> <dd>[<a href="https://www.iana.org/go/rfc8200">RFC8200</a>][<a href="https://www.iana.org/go/rfc5871">RFC5871</a>]</dd> <dt>Note</dt> <dd> <pre>For Traffic Class related information, please see [<a href="https://www.iana.org/go/rfc2474">RFC2474</a>],[<a href="https://www.iana.org/go/rfc3168">RFC3168</a>], and [<a href="https://www.iana.org/assignments/dscp-registry">https://www.iana.org/assignments/dscp-registry</a>]. For IPv6 Router Alert Option Values, please see: [<a href="https://www.iana.org/assignments/ipv6-routeralert-values">https://www.iana.org/assignments/ipv6-routeralert-values</a>] </pre> </dd> <dt>Available Formats</dt> <dd> <a class="altformat" href="ipv6-parameters-3.csv"><img src="/_img/icons/text-csv.png" /><br />CSV</a> </dd> </dl> <table id="table-ipv6-parameters-3" class="sortable"> <thead> <tr> <th>Value</th> <th>Description</th> <th>Reference</th> </tr> </thead> <tbody> <tr> <td align="center">0</td> <td>Source Route (DEPRECATED)</td> <td>[<a href="https://www.iana.org/go/rfc2460">RFC2460</a>][<a href="https://www.iana.org/go/rfc5095">RFC5095</a>]</td> </tr> <tr> <td align="center">1</td> <td>Nimrod (DEPRECATED 2009-05-06)</td> <td></td> </tr> <tr> <td align="center">2</td> <td>Type 2 Routing Header</td> <td>[<a href="https://www.iana.org/go/rfc6275">RFC6275</a>]</td> </tr> <tr> <td align="center">3</td> <td>RPL Source Route Header</td> <td>[<a href="https://www.iana.org/go/rfc6554">RFC6554</a>]</td> </tr> <tr> <td align="center">4</td> <td>Segment Routing Header (SRH)</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">5</td> <td>CRH-16</td> <td>[<a href="https://www.iana.org/go/rfc9631">RFC9631</a>]</td> </tr> <tr> <td align="center">6</td> <td>CRH-32</td> <td>[<a href="https://www.iana.org/go/rfc9631">RFC9631</a>]</td> </tr> <tr> <td align="center">7-252</td> <td>Unassigned</td> <td></td> </tr> <tr> <td align="center">253</td> <td>RFC3692-style Experiment 1 [2]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">254</td> <td>RFC3692-style Experiment 2 [2]</td> <td>[<a href="https://www.iana.org/go/rfc4727">RFC4727</a>]</td> </tr> <tr> <td align="center">255</td> <td>Reserved</td> <td></td> </tr> </tbody> </table> <h2><a name="rpl-option-tlv" id="rpl-option-tlv"></a>RPL-option-TLV</h2> <dl> <dt>Registration Procedure(s)</dt> <dd> <pre>IETF Review</pre> </dd> <dt>Reference</dt> <dd>[<a href="https://www.iana.org/go/rfc6553">RFC6553</a>]</dd> <dt>Available Formats</dt> <dd> <a class="altformat" href="rpl-option-tlv.csv"><img src="/_img/icons/text-csv.png" /><br />CSV</a> </dd> </dl> <table id="table-rpl-option-tlv" class="sortable"> <thead> <tr> <th>Value</th> <th>Description</th> <th>Reference</th> </tr> </thead> <tbody> <tr> <td align="center">0-254</td> <td>Unassigned</td> <td></td> </tr> <tr> <td align="center">255</td> <td>Reserved</td> <td>[<a href="https://www.iana.org/go/rfc6553">RFC6553</a>]</td> </tr> </tbody> </table> <h2><a name="taggerId-types" id="taggerId-types"></a>TaggerId Types</h2> <dl> <dt>Registration Procedure(s)</dt> <dd> <pre>IETF Review</pre> </dd> <dt>Reference</dt> <dd>[<a href="https://www.iana.org/go/rfc6621">RFC6621</a>]</dd> <dt>Available Formats</dt> <dd> <a class="altformat" href="taggerId-types.csv"><img src="/_img/icons/text-csv.png" /><br />CSV</a> </dd> </dl> <table id="table-taggerId-types" class="sortable"> <thead> <tr> <th>Type</th> <th>Mnemonic</th> <th>Description</th> <th>Reference</th> </tr> </thead> <tbody> <tr> <td align="center">0</td> <td>NULL</td> <td>No TaggerId field is present</td> <td>[<a href="https://www.iana.org/go/rfc6621">RFC6621</a>]</td> </tr> <tr> <td align="center">1</td> <td>DEFAULT</td> <td>A TaggerId of non-specific context is present</td> <td>[<a href="https://www.iana.org/go/rfc6621">RFC6621</a>]</td> </tr> <tr> <td align="center">2</td> <td>IPv4</td> <td>A TaggerId representing an IPv4 address is present</td> <td>[<a href="https://www.iana.org/go/rfc6621">RFC6621</a>]</td> </tr> <tr> <td align="center">3</td> <td>IPv6</td> <td>A TaggerId representing an IPv6 address is present</td> <td>[<a href="https://www.iana.org/go/rfc6621">RFC6621</a>]</td> </tr> <tr> <td align="center">4-7</td> <td></td> <td>Unassigned</td> <td></td> </tr> </tbody> </table> <h2><a name="segment-routing-header-flags" id="segment-routing-header-flags"></a>Segment Routing Header Flags</h2> <dl> <dt>Registration Procedure(s)</dt> <dd> <pre>IETF Review</pre> </dd> <dt>Reference</dt> <dd>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</dd> <dt>Available Formats</dt> <dd> <a class="altformat" href="segment-routing-header-flags.csv"><img src="/_img/icons/text-csv.png" /><br />CSV</a> </dd> </dl> <table id="table-segment-routing-header-flags" class="sortable"> <thead> <tr> <th>Bit</th> <th>Description</th> <th>Reference</th> </tr> </thead> <tbody> <tr> <td align="center">0-1</td> <td>Unassigned</td> <td></td> </tr> <tr> <td align="center">2</td> <td>O-flag</td> <td>[<a href="https://www.iana.org/go/rfc9259">RFC9259</a>]</td> </tr> <tr> <td align="center">3-7</td> <td>Unassigned</td> <td></td> </tr> </tbody> </table> <h2><a name="segment-routing-header-tlvs" id="segment-routing-header-tlvs"></a>Segment Routing Header TLVs</h2> <dl> <dt>Registration Procedure(s)</dt> <dd> <pre>IETF Review</pre> </dd> <dt>Reference</dt> <dd>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>][<a href="http://www.rfc-editor.org/errata_search.php?eid=7081">RFC Errata 7081</a>]</dd> <dt>Note</dt> <dd> <pre>0-127: TLVs that do not change en route. 128-255: TLVs that may change en route. </pre> </dd> <dt>Available Formats</dt> <dd> <a class="altformat" href="segment-routing-header-tlvs.csv"><img src="/_img/icons/text-csv.png" /><br />CSV</a> </dd> </dl> <table id="table-segment-routing-header-tlvs" class="sortable"> <thead> <tr> <th>Value</th> <th>Description</th> <th>Reference</th> </tr> </thead> <tbody> <tr> <td align="center">0</td> <td>Pad1 TLV</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">1</td> <td>Reserved</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">2</td> <td>Reserved</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">3</td> <td>Reserved</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">4</td> <td>PadN TLV</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">5</td> <td>HMAC TLV</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">6</td> <td>Reserved</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">7-123</td> <td>Unassigned</td> <td></td> </tr> <tr> <td align="center">124-126</td> <td>Experimentation and Test</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">127</td> <td>Reserved</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">128-251</td> <td>Unassigned</td> <td></td> </tr> <tr> <td align="center">252-254</td> <td>Experimentation and Test</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> <tr> <td align="center">255</td> <td>Reserved</td> <td>[<a href="https://www.iana.org/go/rfc8754">RFC8754</a>]</td> </tr> </tbody> </table> <h1>Footnotes</h1> <table class="fn"> <tr> <td class="fn" valign="top"> <a name="note1" id="note1">[1]</a> </td> <td class="fn"> <pre>It is only appropriate to use these values in explicitly-configured experiments; they MUST NOT be shipped as defaults in implementations. See [<a href="https://www.iana.org/go/rfc3692">RFC3692</a>] for details.</pre> </td> </tr> <tr> <td class="fn" valign="top"> <a name="note2" id="note2">[2]</a> </td> <td class="fn"> <pre>It is only appropriate to use these values in explicitly-configured experiments; they MUST NOT be shipped as defaults in implementations. See [<a href="https://www.iana.org/go/rfc3692">RFC3692</a>] for details.</pre> </td> </tr> </table> </article> <footer> <div> <a href="https://www.iana.org/help/licensing-terms">Licensing Terms</a> </div> </footer> </body> </html>