MAC Address Vendor Lookup
Identify the manufacturer behind a MAC address by looking up the OUI (Organisationally Unique Identifier).
Quick answer: Identify the manufacturer behind a MAC address by looking up the OUI (Organisationally Unique Identifier).
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Frequently asked questions
- Why does only the first half of the MAC matter?
- MAC addresses split into the first three bytes (OUI, identifying the vendor) and the last three (the device's serial within that vendor). Vendor lookup only needs the OUI.
- Is the lookup database complete?
- We bundle a curated subset covering the most common vendors. For the full IEEE OUI list, the IEEE publishes oui.csv free of charge.
- What does 'locally administered' mean?
- A bit in the first byte indicates the address was assigned by an admin/OS rather than burned in by the manufacturer. Modern phones flip this bit on Wi-Fi to randomise their MAC for privacy — so you can't always trust the OUI to identify the device.
- Is the data uploaded?
- No — the lookup is a pure-browser dictionary check.
- Why does my iPhone show a different vendor on each Wi-Fi network?
- Apple (and Google, on Android 10+) randomise the MAC per SSID. The first byte's locally-administered bit will be set to indicate this.