How to use
- Type or paste your addresses into the MAC addresses field, one per line. Results appear as you type.
- Choose AA:BB or aa:bb under Output case.
- Choose Colon (:), Hyphen (-), Cisco (.) or None under Separator.
- Click Copy to copy the result.
- Click Download CSV to save the results as a CSV file.
Examples
Look up an Apple address from a switch table
3c2e.ff12.3456
MAC: 3C:2E:FF:12:34:56 Organization: Apple, Inc. Prefix: 3C:2E:FF (/24, MA-L) Country: US Type: Universally administered, Unicast
Look up a small MA-S block
70-B3-D5-FD-F1-23
MAC: 70-B3-D5-FD-F1-23 Organization: NARA CONTROLS INC. Prefix: 70:B3:D5:FD:F (/36, MA-S) Country: KR Type: Universally administered, Unicast
Format a mixed address list in lowercase
3C:2E:FF:12:34:56 5A:2B:7C:11:22:33 FF:FF:FF:FF:FF:FF
# Input MAC Organization Prefix Block Country Flags 1 3C:2E:FF:12:34:56 3c-2e-ff-12-34-56 Apple, Inc. 3C:2E:FF MA-L US universal 2 5A:2B:7C:11:22:33 5a-2b-7c-11-22-33 Locally administered (not registered; often a random address) local 3 FF:FF:FF:FF:FF:FF ff-ff-ff-ff-ff-ff Broadcast address local, multicast, Broadcast address
FAQ
Why does my MAC address show no vendor?
A locally administered address may be randomized for privacy and have no registered manufacturer. A block assigned after the database snapshot may also be missing.
Can a MAC address identify a device, its owner or its location?
The lookup shows the organization an address block is registered to. It cannot identify a specific device, its owner or its location, or reveal the hardware MAC behind a randomized address.
Can I look up just an OUI?
Enter the first six hexadecimal digits to look up a 24-bit OUI. If the result names IEEE Registration Authority, enter the full MAC address to check for a more specific assignment.
Where does the vendor database come from?
It uses the IEEE Registration Authority public listings for MA-L, MA-M, MA-S, IAB and CID. The current snapshot is dated October 1, 2026. Its date appears below the results.
Is my MAC address sent to your server?
Your MAC address is not uploaded or stored. The lookup runs in your browser. The page downloads static database files selected by one byte of the address prefix, so the server can see which byte-file was requested.