MAC Address Block Medium (MA-M)
MA-M is a 28-bit identifier that can be used to create various extended identifiers. It is most often used to create IEEE 802-defined MAC addresses (EUI-48 and EUI-64). The MA-M does not include assignment of an OUI.
The MA-M assignment may be appended with 20 organization-supplied bits to form an EUI-48 or 36 organization-supplied bits to form an EUI-64. The MA-M assignment may also be used to generate EUI-60 (deprecated), CDI-32, TCDI-40, MAC-48 (obsolete term), and create multicast addresses (per IEEE Std 802). The MA-M assignment may be extended to create an OUI-36 and various extended identifiers based on the OUI-36.
Applications making use of an MA-M assignment should make no assumptions about the bit pattern that will be present in the (24-bit most-significant) OUI portion of the assigned MA-M.
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-M
(Company name & address will be displayed on the IEEE public listing)
|Yearly Confidentiality Renewal Fee*
(Company name & address will *not* be displayed on the IEEE public listing)
|*Assignees will 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 1212™-1991 Control and Status Register (CSR) Architecture referenced by IEEE 896.2™-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.