IANA OUI Ethernet Numbers

Last Updated

2026-08-18

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 [IANA registry ieee-802-numbers].

  

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Registries Included Below

• IANA MAC ADDRESS BLOCK
  • IANA Unicast 48-bit MAC Addresses
  • IANA Multicast 48-bit MAC Addresses
  • IANA 64-bit MAC Addresses
• The CFxxxx Series
• SNAP Protocol Numbers
• IANA Link Layer Discovery Protocol (LLDP) TLV Subtypes
• IANA PTP TLV Subtypes

IANA MAC ADDRESS BLOCK

Registration Procedure(s)

See [RFC 9542].

Expert(s)

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

Reference

[RFC 9542]

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.  
    

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 [IANA registry ppp-numbers].

SNAP Protocol Numbers

Registration Procedure(s)

Expert Review

Expert(s)

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

Reference

[RFC 9542]

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].
    

Available Formats

CSV

IANA Link Layer Discovery Protocol (LLDP) TLV Subtypes

Registration Procedure(s)

Expert Review

Expert(s)

Eliot Lear, Dan Romascanu

Reference

[RFC 8520][RFC 9542]

Available Formats

CSV

IANA PTP TLV Subtypes

Expert(s)

Unassigned

Reference

[RFC 10030]

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.
    

Available Formats

CSV

Contact Information