MAC Address Lookup
Look up the vendor/manufacturer of a MAC address by its OUI prefix. Validate format and check address type. Runs entirely in your browser.
Local processingWhat is MAC Address Lookup?
The first 24 bits (OUI) of a MAC address identify the manufacturer. The remaining 24 bits are device-specific. The OUI is assigned by the IEEE Registration Authority.
How It Works
Extracts the OUI (first 3 bytes) from the input MAC, looks it up in a built-in vendor table, and checks the multicast/locally-administered bits to determine address type.
Common Use Cases
- Identifying device manufacturers on a network
- Validating MAC address formats
- Network inventory and auditing
Technical Details
OUI: 24-bit Organizationally Unique Identifier. Built-in database: ~100 common vendors. Bit flags: I/G (multicast), U/L (locally administered).
How to Use
- Enter a MAC address
- Click Lookup
- View vendor and address type
Privacy
All processing happens in your browser. Your data is never uploaded to any server.
FAQ
How does the lookup work?
The first 3 bytes (OUI) are matched against a built-in vendor table. The database covers ~100 common vendors including Apple, Dell, Cisco, VMware, and Intel.