MAC Address Vendor Lookup
Look up the manufacturer behind a MAC address using the IEEE OUI database. Accepts colon, hyphen, and unseparated formats, supports batch lookups, and distinguishes local from globally unique addresses.
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How to Use
- Enter a MAC address in any supported format: AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, or AABBCCDDEEFF.
- The tool detects the format automatically and normalizes how it is displayed.
- Click the "Look up" button to see the vendor that owns the address.
- Review the vendor name, country, and other registration details.
Features
- Resolves the first three bytes of a MAC address against the IEEE OUI database to identify the vendor.
- Accepts colon-separated, hyphen-separated, and unseparated MAC formats.
- Shows the vendor name along with the registered address and country.
- Distinguishes locally administered addresses (LAA) from universally administered ones (UAA).
- Handles batch lookups of multiple MAC addresses at once.
Use Cases
Network asset management
Identify the vendor of each device attached to the corporate network to help IT staff inventory and categorize hardware.
Identifying unknown devices
When something unfamiliar appears on the network, the vendor gives you an early clue about what it is, a router, a camera, or a phone.
Troubleshooting the network
While reading an ARP table or a switch port list, resolve MAC addresses to vendors to narrow down a fault faster.
Security auditing
Review the MAC addresses present on your network periodically to spot vendors that should not be there and catch unauthorized devices.
FAQ
What is the OUI part of a MAC address?
The Organizationally Unique Identifier is the first three bytes, six hex characters, of a MAC address. The IEEE assigns it to a network equipment manufacturer, which is what makes vendor identification and security auditing possible.
Is the vendor the device brand or the chipset maker?
The OUI identifies whoever made the network chip or module, which is not always the brand on the box. Many phone makers buy WiFi chips from Qualcomm or Broadcom, so you will see the chip vendor instead.
Can a MAC address be spoofed?
Yes. MAC addresses can be changed at the operating system level, which is exactly why MAC filtering offers limited security and should never be your only means of authentication.
Why does a lookup sometimes return nothing?
Common reasons are a randomized MAC, which modern phones generate when joining WiFi, a locally administered address, a newly registered OUI not yet in the database, or a private internal OUI.