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An organizationally unique identifier (OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization.. OUIs are purchased from the Institute of Electrical and Electronics Engineers (IEEE) Registration Authority by the assignee (IEEE term for the vendor, manufacturer, or other organization).
The [1] IEEE Registration Authority is the administrative body that is responsible for registering and administering organizationally unique identifiers (OUI) and other types of identifiers which are used in the computer and electronics industries (Individual Address Blocks (IAB), Manufacturer IDs, Standard Group MAC Addresses, Unique Registration Numbers (URN), EtherType values, etc.)
The IAB uses an OUI from the MA-L (MAC address block, large) registry, previously called the OUI registry. The term OUI is still in use, [6] but the IEEE Registration Authority does not administer them. An OUI is concatenated with 12 additional IEEE-provided bits (for a total of 36 bits), leaving only 12 bits for the organisation owning the IAB ...
"Original" IEEE formats are essentially a two-byte header followed by an embedded EUI-48 address (which contains the OUI). The first 2 bytes are either hex 10:00 or 2x:xx (where the x's are vendor-specified) followed by the 3-byte OUI and 3 bytes for a vendor-specified serial number.
IEEE Std 802 IEEE OUI Assignments: EIA: Electronics Industry Alliance Organization EIA: EIGRP: Enhanced Interior Gateway Routing Protocol Internet Layer Cisco Doc ID: 16406: EMAC: Ethernet Media Access Control Link Layer EOF: End Of Frame (HDLC, etc.) Link layer HDLC framing: ESS: Extended service set (Wi-Fi group) Wireless IEEE Std 802.11-2007 ...
According to IEEE Std 802.1AB, §9.6.1.3, "The Organizationally Unique Identifier shall contain the organization's OUI as defined in IEEE Std 802-2001." Each organization is responsible for managing its subtypes.
In contrast to other UUID versions, version-1 and -2 UUIDs based on MAC addresses from network cards rely for their uniqueness in part on an identifier issued by a central registration authority, namely the Organizationally Unique Identifier (OUI) part of the MAC address, which is issued by the IEEE to manufacturers of networking equipment. [14]
IEEE 802.11ba Wake-up Radio (WUR) Operation is an amendment to the IEEE 802.11 standard that enables energy-efficient operation for data reception without increasing latency. [83] The target active power consumption to receive a WUR packet is less than 1 milliwatt and supports data rates of 62.5 kbit/s and 250 kbit/s.