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MAC Address Vendor Lookup

Identify the manufacturer or vendor of a network device by its MAC address (OUI lookup).

Formats: AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, or AABB.CCDD.EEFF

Frequently Asked Questions

Common questions about the MAC Address Vendor Lookup tool.

A 48-bit unique identifier burned into every network interface. The first 24 bits (OUI) identify the manufacturer; the last 24 bits are per-device.

To identify unknown devices on your LAN (was that 00:1A:A0 a Dell server or a rogue laptop?), to troubleshoot DHCP leases, or to find the vendor of a device in a security incident.

Yes — every modern OS can override the MAC. So MAC-based identification is NOT a trustworthy security control. Use 802.1X or certificate-based NAC for real device identity.

OUI (Organizationally Unique Identifier) is the first 24 bits. It's assigned by IEEE to each manufacturer. The full MAC address (48 bits) = OUI + per-device suffix.

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