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IANA OUI Ethernet Numbers
IANA OUI Ethernet Numbers
Last Updated
2025-07-22
Note
This page has assignments by IANA as specified in [RFC9542 ]
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 ].
Available Formats
Registries Included Below
Registration Procedure(s)
See [RFC9542 ].
Expert(s)
Donald Eastlake (primary), Juan Carlos Zuniga (secondary)
Reference
[RFC9542 ]
Note
IANA allocates addresses under the IANA OUI (00-00-5E) as explained in
[RFC9542 ]. 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 [RFC9542 ], 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.
Note
These values are prefixed with 00-00-5E. See Section 2.1.3 of
[RFC9542 ].
Available Formats
Range
Registration Procedures
Small to medium assignments of up to 65536 identifiers
Expert Review
Large assignments of 131072 or more identifiers
IESG Ratification, as defined in [RFC9542 ], Section 5.1
Assignment(s) in the 00-00-00 to 00-00-FF range
IESG Ratification, as defined in [RFC9542 ], Section 5.1
Addresses
Usage
Reference
00-00-00 to 00-00-FF
Reserved
[RFC9542 ]
00-01-00 to 00-01-FF
VRRP (Virtual Router Redundancy Protocol)
[RFC9568 ]
00-02-00 to 00-02-FF
VRRP IPv6 (Virtual Router Redundancy Protocol IPv6)
[RFC9568 ]
00-03-00 to 00-51-FF
Unassigned
00-52-00
PacketPWEthA
[RFC6658 ]
00-52-01
PacketPWEthB
[RFC6658 ]
00-52-02
BFD for VXLAN
[RFC8971 ]
00-52-03 to 00-52-12
Unassigned (small allocations)
00-52-13
Proxy Mobile IPv6
[RFC6543 ]
00-52-14 to 00-52-FF
Unassigned (small allocations)
00-53-00 to 00-53-FF
Documentation
[RFC9542 ]
00-54-00 to 90-00-FF
Unassigned
90-01-00
TRILL OAM
[RFC7455 ]
90-01-01 to 90-01-FF
Unassigned (small allocations requiring both unicast and multicast)
90-02-00 to FF-FF-FF
Unassigned
Note
These values are prefixed with 01-00-5E. See Section 2.1.3 of
[RFC9542 ].
Available Formats
Range
Registration Procedures
Small to medium assignments of up to 65536 identifiers
Expert Review
Large assignments of 131072 or more identifiers
IESG Ratification, as defined in [RFC9542 ], Section 5.1
Addresses
Usage
Reference
00-00-00 to 7F-FF-FF
IPv4 Multicast
[RFC1112 ]
80-00-00 to 8F-FF-FF
MPLS Multicast
[RFC5332 ]
90-00-00
MPLS-TP p2p
[RFC7213 ]
90-00-01
Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) Interfaces
[RFC7130 ]
90-00-02
AllL1MI-ISs
[RFC8202 ]
90-00-03
AllL2MI-ISs
[RFC8202 ]
90-00-04 to 90-00-FF
Unassigned (small allocations)
90-01-00
TRILL OAM
[RFC7455 ]
90-01-01 to 90-01-FF
Unassigned (small allocations requiring both unicast and multicast)
90-02-00 to 90-0F-FF
Unassigned
90-10-00 to 90-10-FF
Documentation
[RFC9542 ]
90-11-00 to FF-FF-FF
Unassigned
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 [RFC9542 ], particularly Section 2.2.2, for more details.
Available Formats
Range
Registration Procedures
Small to medium assignments of up to 268435456 identifiers
Expert Review
Assignments of any size, including blocks of 536870912 or more
IESG Ratification, as defined in [RFC9542 ], Section 5.1
Assignments from Reserved ranges
IESG Ratification, as defined in [RFC9542 ], Section 5.1
Addresses
Usage
Reference
00-00-00-00-00 to 0F-FF-FF-FF-FF
Reserved
[RFC9542 ]
10-00-00-00-00 to 10-00-00-00-FF
Documentation
[RFC9542 ]
10-00-00-01-00 to EF-FF-FF-FF-FF
Unassigned
FD-00-00-00-00 to FD-FF-FF-FF-FF
Reserved
[RFC9542 ]
FE-00-00-00-00 to FE-FF-FF-FF-FF
IPv4 Addr Holders
[RFC9542 ]
FF-00-00-00-00 to FF-FD-FF-FF-FF
Reserved
[RFC9542 ]
FF-FE-00-00-00 to FF-FE-FF-FF-FF
IANA EUI-48 Holders
[RFC9542 ]
FF-FF-00-00-00 to FF-FF-FF-FF-FF
Reserved
[RFC9542 ]
Note
[RFC2153 ] 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 [RFC5342 ].
Please see [IANA registry ppp-numbers ].
Value
Description
Reference
No registrations at this time.
Registration Procedure(s)
Expert Review
Expert(s)
Donald Eastlake (primary), Juan Carlos Zuniga (secondary)
Reference
[RFC9542 ]
Note
The SNAP protocol number assignments use the IANA OUI. Values 0000 and FFFF require
IESG Ratification as described in section 5.1 of [RFC9542 ].
Available Formats
Protocol Number (decimal)
Protocol Number (hex)
Description
References
0000
0000
reserved
[RFC9542 ]
0001
0001
MARS Data Messages (short form)
[RFC2022 ]
0002
0002
reserved for future NHRP use
[RFC2332 ]
0003
0003
MARS/NHRP Control Messages
[RFC2022 ][RFC2332 ]
0004
0004
MARS Data Messages (long form)
[RFC2022 ]
0005
0005
SCSP - Server Cache Sync Protocol
[RFC2334 ]
0006
0006
VRID - Virtual Router MAC Address
[S_Knight ]
0007
0007
L2TP
[RFC3070 ]
0008
0008
Virtual Private Network ID
[RFC2684 ]
0009-0065
0009-0041
Unassigned
0066
0042
Documentation Use
[RFC9542 ]
0067-65534
0043-FFFE
Unassigned
65535
FFFF
Reserved
[RFC9542 ]
Registration Procedure(s)
Expert Review
Expert(s)
Eliot Lear, Dan Romascanu
Reference
[RFC8520 ][RFC9542 ]
Available Formats
Value
Description
Reference
0
Reserved
[RFC9542 ]
1
the Manufacturer Usage Description (MUD) Uniform Resource Locator (URL)
[RFC8520 ]
2-41
Unassigned
42
Example for use in documentation
[RFC9542 ]
43-254
Unassigned
255
Reserved
[RFC9542 ]
Contact Information
