MAC Address Lookup

Look up the manufacturer or vendor associated with a MAC address using the OUI prefix database.

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1. Paste or type a MAC address in any common format (colon, hyphen, dot notation, or plain hex). 2. You can enter a full 6-octet address or just the first 3 octets (OUI prefix) for a quick vendor check. 3. Click "Look Up" to search the bundled IEEE OUI database for the matching manufacturer. 4. Review the results showing the registered organization name, address, and OUI assignment details. 5. If the address is locally administered or randomized, the tool will indicate that no vendor match was found.

About This Tool

The MAC Address Lookup tool identifies the manufacturer or vendor of a network device from its MAC address. Enter any MAC address and instantly see which organization registered the OUI (Organizationally Unique Identifier) prefix, along with the company name and registration details.

This is an essential diagnostic tool for network administrators troubleshooting unknown devices on their network. When you see an unfamiliar MAC address in your DHCP logs, ARP table, or network monitoring system, a quick OUI lookup can tell you whether it belongs to a laptop, a phone, a smart home device, or potentially an unauthorized device.

The lookup uses a bundled OUI database so queries are processed entirely in your browser without any network requests. This means fast results and complete privacy - your MAC addresses are never transmitted to any external service.

Frequently Asked Questions

The lookup uses the IEEE OUI registry database which covers all officially registered manufacturer prefixes. It accurately identifies the registered organization for any valid OUI. However, some devices use randomized MAC addresses for privacy, which will not match any registered vendor.
Modern devices (especially smartphones) increasingly use MAC address randomization for privacy. These randomized addresses use the locally administered bit and will not match any vendor in the OUI database.
The tool accepts MAC addresses in common formats including colon-separated (AA:BB:CC:DD:EE:FF), hyphen-separated (AA-BB-CC-DD-EE-FF), Cisco dot notation (AABB.CCDD.EEFF), or plain hex (AABBCCDDEEFF). You can also enter just the first three octets for a partial lookup.

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