List of MAC address vendor assignments managed by IEEE.
Overview
MAC Address Vendor Assignments
MAC Address Vendor Assignments is an allocation system for network device identifiers managed by the IEEE Registration Authority. There are three block types: MA-L (formerly OUI), MA-M, and MA-S, with unique identifiers assigned to each vendor. This enables unique identification of network devices worldwide, used in Ethernet, Wi-Fi, Bluetooth, and other communications.
MAC address
OUI
IEEE
network
vendor identification
Ethernet
Wi-Fi
| code | slug | name | description | addressCount | eui48Support | eui64Support | ieeeAssignedBits | previousName |
|---|---|---|---|---|---|---|---|---|
| MA-L | ma-l-mac-address-block-large | MA-L (MAC Address Block Large) | Large block of approximately 16 million addresses, equivalent to the traditional OUI. | ~16,777,216 (2^24) | true | true | 24 | OUI (Organizationally Unique Identifier) |
| MA-M | ma-m-mac-address-block-medium | MA-M (MAC Address Block Medium) | Medium block of approximately 1 million addresses. | ~1,048,576 (2^20) | true | true | 28 | |
| MA-S | ma-s-mac-address-block-small | MA-S (MAC Address Block Small) | Small block of 4,096 addresses, equivalent to the traditional OUI-36. | 4,096 (2^12) | true | true | 36 | OUI-36, IAB (Individual Address Block) |
| CID | cid-company-id | CID (Company ID) | 24-bit identifier that cannot be used to generate MAC addresses. | N/A（MACアドレス生成不可） | false | false | 24 |