MAC Address Lookup
Identify the vendor behind a MAC address, and decode what its first byte says about it.
Runs entirely in your browser.
Look Up a MAC Address Vendor and Decode Its Bits
About MAC Address Lookup
The first three bytes of a MAC address are the OUI - the block assigned to a manufacturer by the IEEE. This page recognises the prefixes that come up most often, including the virtualisation ranges worth knowing on sight: 00:50:56 is VMware, 08:00:27 is VirtualBox, 52:54:00 is QEMU or KVM, B8:27:EB is a Raspberry Pi.
The vendor list here is a curated subset, not the whole registry of 30,000-plus assignments. Anything it does not recognise is reported as unknown rather than guessed at - check the IEEE registry for those.
Two bits in the first byte need no database at all, and often answer the question on their own. The local bit means the address was made up rather than assigned, so no vendor lookup can ever succeed - which is why randomised Wi-Fi privacy addresses never resolve to a manufacturer.
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- IP Range Expander — CIDR or range to a full list
- IPv6 ULA Generator — a private RFC 4193 prefix
- MAC Address Generator — random addresses in any format
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- HTTP Header Analyzer — explain response headers
