Free online tool

MAC Address Lookup

Paste one or many MAC addresses to see the registered vendor, country and IEEE block, with private and multicast addresses flagged.

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or click to browse, or paste from the clipboard

Official IEEE registry

Matches the longest assigned prefix across the IEEE MA-L (OUI), MA-M and MA-S public listings, so smaller blocks resolve to the right company.

Any format, many at once

Paste up to 1,000 addresses with colons, hyphens, Cisco-style dots or no separators. A 6-digit prefix works too. Export the table as CSV.

Private and multicast flags

Randomized locally administered addresses, multicast groups and broadcast are labelled, so an unmatched address is explained. Lookups run in your browser.

How to look up a MAC address

  1. 1

    Paste one or more MAC addresses or prefixes, one per line.

  2. 2

    Select Look up, or press Ctrl+Enter.

  3. 3

    Read the vendor, country and assignment, then copy the results or download a CSV.

What people use this tool for

  • Identify an unknown device in a router's connected-clients list.
  • Check which manufacturer's network cards appear in a log or scan.
  • Spot randomized private addresses before blocking or allowlisting a device.

Frequently Asked Questions

How does a MAC address lookup work?

The first 24, 28 or 36 bits of a MAC address are assigned to a company by the IEEE Registration Authority. This tool finds the longest matching assignment in IEEE's public listings and shows the registered organization and country.

Why does my phone's MAC address show no vendor?

Modern phones and computers often use a randomized private MAC address on Wi-Fi. These set the locally administered bit, so they are not registered to any manufacturer. The tool labels them instead of guessing.

Which formats can I enter?

00:1A:2B:3C:4D:5E, 00-1A-2B-3C-4D-5E, 001A.2B3C.4D5E and 001A2B3C4D5E all work, in upper or lower case. You can also enter just the first 6 hex digits. Put each address on its own line, or separate them with commas.

Is the vendor always the device maker?

It is the organization that registered the address block. That can be the network chip maker or an original equipment manufacturer rather than the brand on the device, and companies change names after mergers.

How current is the data?

The database is built from the IEEE MA-L, MA-M and MA-S public listings, and the status line shows the date it was generated. Very recent assignments may be missing until the next update.

Are the addresses I enter sent anywhere?

No. The vendor database downloads once to your browser, about 0.6 MB compressed, and every lookup happens locally on this page.