IANA OUI Ethernet Numbers

Last Updated

• 2026-10-13

Note

This page has assignments by IANA as specified in RFC 9542 to be under the IANA OUI. For some information on IEEE 802 number assignments by the IEEE Registration Authority and how to contact that authority, see the IEEE 802 Numbers.

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IANA MAC ADDRESS BLOCK

Registration Procedure(s)

• See RFC 9542.

Expert(s)

• Donald Eastlake (primary), Juan Carlos Zuniga (secondary)

Reference

• RFC 9542: IANA Considerations and IETF Protocol and Documentation Usage for IEEE 802 Parameters

Note

IANA allocates addresses under the IANA OUI (00-00-5E) as explained in RFC 9542. Unicast addresses under the IANA OUI start with 00-00-5E, while multicast addresses under the IANA OUI start with 01-00-5E. In the lists below, these initial 3 bytes are omitted for brevity. As described in RFC 9542, 48-bit MAC addresses in the range 33-33-00-00-00-00 to 33-33-FF-FF-FF-FF are used for IPv6 multicast.

When the available space for either multicast or unicast EUI-48 identifiers under OUI 00-00-5E has been 90% or more exhausted, IANA should request an additional OUI from the IEEE Registration Authority for further IANA assignment use. The appointed Expert(s) should monitor for this condition and notify IANA.

IANA Unicast 48-bit MAC Addresses

Note

These values are prefixed with 00-00-5E. See Section 2.1.3 of RFC 9542.

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IANA Multicast 48-bit MAC Addresses

Note

These values are prefixed with 01-00-5E. See Section 2.1.3 of RFC 9542.

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• CSV

IANA 64-bit MAC Addresses

Note

These values are prefixed with 00-00-5E to form unicast MAC addresses, with 01-00-5E to form multicast MAC addresses, with 02-00-5E to form unicast modified EUI-64 addresses, and with 03-00-5E to form multicast modified EUI-64 addresses. See RFC 9542, particularly Section 2.2.2, for more details.

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The CFxxxx Series

Note

RFC 2153 described a method of using a "pseudo OUI" for certain purposes when there is no appropriate regular OUI assigned. The registry for these is on the PPP Parameters IANA web page. The CF series registry has been closed by RFC 5342. Please see Point-to-Point (PPP) Protocol Field Assignments.

SNAP Protocol Numbers

Registration Procedure(s)

• Expert Review

Expert(s)

• Donald Eastlake (primary), Juan Carlos Zuniga (secondary)

Reference

• RFC 9542: IANA Considerations and IETF Protocol and Documentation Usage for IEEE 802 Parameters

Note

The SNAP protocol number assignments use the IANA OUI. Values 0000 and FFFF require IESG Ratification as described in Section 5.1 of RFC 9542.

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• CSV

IANA Link Layer Discovery Protocol (LLDP) TLV Subtypes

Registration Procedure(s)

• Expert Review

Expert(s)

• Eliot Lear, Dan Romascanu

Reference

• RFC 8520: Manufacturer Usage Description Specification
• RFC 9542: IANA Considerations and IETF Protocol and Documentation Usage for IEEE 802 Parameters

Available Formats

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IANA PTP TLV Subtypes

Expert(s)

• Miroslav Lichvar, Karen O'Donoghue

Reference

• RFC 10030: Network Time Protocol (NTP) over the Precision Time Protocol (PTP)

Note

IEEE 1588-2019 (PTP version 2.1) defines several organization-specific TLVs. These values are the organizationSubType of TLVs having the IANA OUI (00-00-5E) as the organizationId.

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