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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). Only assignment from ...
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.)
"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.
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 ...
OUI: Organization Unique Identifier Link and other layers IEEE OUI Assignments: PAP: Password authentication protocol Security RFC 1334 PAT: Port address translation Internet Layer RFC 1918 PaaS: Platform as a service Cloud Computing/Service Platform as a service: PC: Personal computer (host) Hardware PIM: Personal information manager Software ...
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.
The SNAP header consists of a 3-octet IEEE organizationally unique identifier (OUI) followed by a 2-octet protocol ID. If the OUI is zero, the protocol ID is the registered EtherType value for the protocol running on top of SNAP. If the OUI is an OUI for a particular organization, the protocol ID is a value assigned by that organization to the ...
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]