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 processingMAC Address Lookup
What 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.