Markdown

MAC Address Vendor Assignments - Markdown

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 |  |