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MAC Address Vendor Assignments - JSON

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": "MA-L",
    "slug": "ma-l-mac-address-block-large",
    "name": "MA-L (MAC Address Block Large)",
    "description": "Large block of approximately 16 million addresses, equivalent to the traditional OUI.",
    "previousName": "OUI (Organizationally Unique Identifier)",
    "ieeeAssignedBits": 24,
    "addressCount": "~16,777,216 (2^24)",
    "eui48Support": true,
    "eui64Support": true
  },
  {
    "code": "MA-M",
    "slug": "ma-m-mac-address-block-medium",
    "name": "MA-M (MAC Address Block Medium)",
    "description": "Medium block of approximately 1 million addresses.",
    "previousName": null,
    "ieeeAssignedBits": 28,
    "addressCount": "~1,048,576 (2^20)",
    "eui48Support": true,
    "eui64Support": true
  },
  {
    "code": "MA-S",
    "slug": "ma-s-mac-address-block-small",
    "name": "MA-S (MAC Address Block Small)",
    "description": "Small block of 4,096 addresses, equivalent to the traditional OUI-36.",
    "previousName": "OUI-36, IAB (Individual Address Block)",
    "ieeeAssignedBits": 36,
    "addressCount": "4,096 (2^12)",
    "eui48Support": true,
    "eui64Support": true
  },
  {
    "code": "CID",
    "slug": "cid-company-id",
    "name": "CID (Company ID)",
    "description": "24-bit identifier that cannot be used to generate MAC addresses.",
    "previousName": null,
    "ieeeAssignedBits": 24,
    "addressCount": "N/A（MACアドレス生成不可）",
    "eui48Support": false,
    "eui64Support": false
  }
]