MAC Address Lookup

Find the organization registered to a MAC address or prefix.

Results appear as you type. Colons, dashes, dots, or bare hex work.

Try an example:

Enter an address or choose an example to get started.

IEEE data updated:

58,421 assignments from 34,053 organizations across 118 countries.

Lookups run in your browser. Your full MAC address is never sent to a server.

Tools

Bulk lookup

Look up a list of up to 2,000 addresses in your browser and export the results as CSV.

MAC generator

Random addresses with control over separator, case, vendor prefix, and the local and multicast bits.

Free API

JSON, XML, CSV, or pipe-delimited. No key, no sign-up, and the same data the site uses.

Cisco vendorMacs.xml

A current vendor file for Prime Infrastructure and the WLC, so clients stop resolving as Unknown.

Largest registrants

All vendors
  1. 1Apple, Inc.🇺🇸1,573
  2. 2HUAWEI TECHNOLOGIES CO.,LTD🇨🇳1,417
  3. 3Cisco Systems, Inc🇺🇸1,253
  4. 4Samsung Electronics Co.,Ltd🇰🇷906
  5. 5Intel Corporate🇲🇾667
  6. 6Huawei Device Co., Ltd.🇨🇳660
  7. 7zte corporation🇨🇳502
  8. 8Texas Instruments🇺🇸401

How it works

A MAC address is 48 bits. The first 24, 28, or 36 of them are a prefix the IEEE sold to one organization; the rest are chosen by that organization. A lookup matches the longest registered prefix, which is the only way to get the right answer when a small block sits inside a larger company's range.

The whole registry is published here as static files, so your browser downloads a few kilobytes covering the prefix you asked about and resolves the answer locally. There is no full MAC address sent to a server.

Data comes straight from the IEEE Registration Authority and is re-imported daily. See the statistics for what is in it, or the FAQ for why a lookup sometimes comes back empty.