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MAC Address Vendor (OUI) Lookup & Formatter

Look up the vendor (OUI) for any MAC address against a bundled IEEE registry (200+ vendors, MA-L/MA-M/MA-S/IAB longest-prefix matching), reformat between colon, hyphen, Cisco dot, and bare hex notations, decode U/L (locally-administered) and I/G (multicast) bits, reverse-search vendor → prefixes, generate random vendor-correct MACs, batch lookup, and CSV export. 100% client-side, offline, no network.

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Look up the vendor (OUI) for any MAC address against a bundled IEEE registry (200+ vendors, MA-L/MA-M/MA-S/IAB longest-prefix matching), reformat between colon, hyphen, Cisco dot, and bare hex notations, decode U/L (locally-administered) and I/G (multicast) bits, reverse-search vendor → prefixes, generate random vendor-correct MACs, batch lookup, and CSV export. 100% client-side, offline, no network. Everything runs locally in your browser — your data never leaves your device.

How to use

  1. Enter your input in the tool above.
  2. Adjust any options to your preference.
  3. Use the Copy or Download buttons to save the result.
  4. Everything happens locally — your data never leaves your browser.
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