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MAC Address Vendor Lookup

Look up the manufacturer and vendor of any network device by its MAC address. Supports the full IEEE OUI database with 40,000+ registered vendors. Useful for network troubleshooting and security audits.

How to Use

  1. Step 1: Enter a MAC address (e.g. AA:BB:CC:DD:EE:FF).
  2. Step 2: The tool looks up the OUI to identify the manufacturer.
  3. Step 3: The vendor name and country are displayed.

Frequently Asked Questions

What is a MAC address?

A MAC address is a unique 48-bit hardware identifier assigned to a network interface card, written as six pairs of hex digits.

What are the first 3 bytes of a MAC address?

The first 3 bytes (OUI) are assigned by the IEEE to manufacturers. The last 3 bytes are assigned by the manufacturer.

Can MAC addresses be changed?

Yes. Linux: ip link set dev eth0 address XX:XX:XX:XX:XX:XX; macOS: sudo ifconfig en0 ether XX:XX:XX:XX:XX:XX; Windows: Device Manager > Network Adapter > Advanced. Changes typically revert after reboot.

How are the first three bytes (OUI) of a MAC address assigned?

The OUI (Organizationally Unique Identifier) is assigned by the IEEE to hardware manufacturers to identify device brands. For example, DC:A6:32 belongs to the Raspberry Pi Foundation. After purchasing an OUI, a company assigns the last three bytes (device-unique portion) freely. Identifying OUIs in a network is useful for asset management and security auditing (detecting unauthorized device brands).