2025-11-25 This page has assignments by IANA as specified in 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 . Donald Eastlake (primary), Juan Carlos Zuniga (secondary) See . IANA allocates addresses under the IANA OUI (00-00-5E) as explained in . 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 , 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. These values are prefixed with 00-00-5E. See Section 2.1.3 of . Expert Review Small to medium assignments of up to 65536 identifiers IESG Ratification, as defined in , Section 5.1 Large assignments of 131072 or more identifiers IESG Ratification, as defined in , Section 5.1 Assignment(s) in the 00-00-00 to 00-00-FF range 00-00-00 to 00-00-FF Reserved 00-01-00 to 00-01-FF VRRP (Virtual Router Redundancy Protocol) 00-02-00 to 00-02-FF VRRP IPv6 (Virtual Router Redundancy Protocol IPv6) 00-03-00 to 00-51-FF Unassigned 00-52-00 PacketPWEthA 00-52-01 PacketPWEthB 00-52-02 BFD for VXLAN 00-52-03 to 00-52-12 Unassigned (small allocations) 00-52-13 Proxy Mobile IPv6 00-52-14 to 00-52-FF Unassigned (small allocations) 00-53-00 to 00-53-FF Documentation 00-54-00 to 90-00-FF Unassigned 90-01-00 TRILL OAM 90-01-01 to 90-01-FF Unassigned (small allocations requiring both unicast and multicast) 90-02-00 to FF-FF-FF Unassigned These values are prefixed with 01-00-5E. See Section 2.1.3 of . Expert Review Small to medium assignments of up to 65536 identifiers IESG Ratification, as defined in , Section 5.1 Large assignments of 131072 or more identifiers 00-00-00 to 7F-FF-FF IPv4 Multicast 80-00-00 to 8F-FF-FF MPLS Multicast 90-00-00 MPLS-TP p2p 90-00-01 Bidirectional Forwarding Detection (BFD) on Link Aggregation Group (LAG) Interfaces 90-00-02 AllL1MI-ISs 90-00-03 AllL2MI-ISs 90-00-04 to 90-00-FF Unassigned (small allocations) 90-01-00 TRILL OAM 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 90-11-00 to FF-FF-FF Unassigned 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 , particularly Section 2.2.2, for more details. Expert Review Small to medium assignments of up to 268435456 identifiers IESG Ratification, as defined in , Section 5.1 Assignments of any size, including blocks of 536870912 or more IESG Ratification, as defined in , Section 5.1 Assignments from Reserved ranges 00-00-00-00-00 to 0F-FF-FF-FF-FF Reserved 10-00-00-00-00 to 10-00-00-00-FF Documentation 10-00-00-01-00 to EF-FF-FF-FF-FF Unassigned FD-00-00-00-00 to FD-FF-FF-FF-FF Reserved FE-00-00-00-00 to FE-FF-FF-FF-FF IPv4 Addr Holders FF-00-00-00-00 to FF-FD-FF-FF-FF Reserved FF-FE-00-00-00 to FF-FE-FF-FF-FF IANA EUI-48 Holders FF-FF-00-00-00 to FF-FF-FF-FF-FF Reserved 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 . Please see . Donald Eastlake (primary), Juan Carlos Zuniga (secondary) Expert Review The SNAP protocol number assignments use the IANA OUI. Values 0000 and FFFF require IESG Ratification as described in section 5.1 of . 0000 0000 reserved 0001 0001 MARS Data Messages (short form) 0002 0002 reserved for future NHRP use 0003 0003 MARS/NHRP Control Messages 0004 0004 MARS Data Messages (long form) 0005 0005 SCSP - Server Cache Sync Protocol 0006 0006 VRID - Virtual Router MAC Address 0007 0007 L2TP 0008 0008 Virtual Private Network ID 0009-0065 0009-0041 Unassigned 0066 0042 Documentation Use 0067-65534 0043-FFFE Unassigned 65535 FFFF Reserved Expert Review Eliot Lear, Dan Romascanu 0 Reserved 1 the Manufacturer Usage Description (MUD) Uniform Resource Locator (URL) 2-41 Unassigned 42 Example for use in documentation 43-254 Unassigned 255 Reserved Unassigned 0-0xFFFF IETF Review 0x10000-0x7FFFFF Specification Required 0x800000-0xFFFFFE Experimental and Private Use 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. 0x0 Reserved 0x1 Network Time Protocol Message 0x2-0x7FFFFF Unassigned 0x800000-0xFFFFFE Reserved for Experimental and Private Use 0xFFFFFF Reserved S. Knight mailto:steven.knight&ascend.com 1997-11