MAC Address Block Large (MA-L)
This product was previously referred to as an OUI (Organizationally Unique Identifier) and is still referred to as such in many standards. OUI is an IEEE Registration Authority (RA) specific term that is referred to in various standards and may be used to identify companies on the IEEE Public Listing. A MA-L assignment includes an OUI and the right to generate various extended identifiers based on that OUI. It is most often used to create IEEE 802-defined MAC addresses (EUI-48 and EUI-64).
The OUI included in the MA-L assignment may be appended with 24 organization-supplied bits to form a EUI-48 or 40 organization-supplied bits to form an EUI-64.
The included OUI may also be used to generate EUI-60 (deprecated), CDI-32, TCDI-40, MAC-48 (obsolete term), create multicast addresses (per IEEE Std 802), and as a unique root for various context dependent identifiers. It may also be used as a company identifier in those protocols and protocol standards that specify the use of a 3 octet field as a part of the protocol identification mechanism.
For more information, please see the tutorial "Guidelines for Use of Organizationally Unique Identifiers (OUI) and Company ID (CID)".
|One Time Fees|
|Publicly Registered MA-L
(Company name & address will be displayed on the IEEE public listing)
|Optional Recurring Fees|
|Yearly Confidentiality Renewal Fee*
(Company name & address will *not* be displayed on the IEEE public listing)
|*Assignees will also be required to pay an annual fee to maintain confidentiality. Payment options for the renewal fee are credit card, check or wire transfer. IEEE does not accept requests for applicant-specified identifiers.
The OUI defined in IEEE 802®-2001 can be used to generate 48-bit Universal LAN MAC addresses to uniquely identify Local and Municipal Area Networks stations, and Protocol Identifiers to identify public and private protocols. These are used in LAN and MAN applications. The relevant standards include but not limited to:
The 'company_id' relevant standards as defined in IEEE 1212TM-1991 Control and Status Register (CSR) Architecture referenced by IEEE 896.2TM-1991 Futurebus+Physical Layers and Profiles include:
The IEEE Registration Authority will assign an additional OUI to any organization requesting one, providing they submit a letter on company letterhead to the IEEE Registration Authority c/o IEEE Standards Department, stating that their company will not "ship" product in the new block assignment until well after they have reached (shipped) at least 95% of the block assignment, in the context of a specified standard. Your company should ensure that large numbers of derived identifiers are not left unused.