MAC Vendor Lookup

Every network interface has a MAC (Media Access Control) address, a 48-bit identifier whose first 3 bytes — the OUI (Organizationally Unique Identifier) — are registered to the manufacturer by the IEEE. This tool decodes a MAC address's OUI against a curated set of commonly seen vendors, and reads two bits that are always meaningful regardless of vendor: whether the address is unicast or multicast, and whether it's universally administered (factory-assigned by the vendor) or locally administered (randomly generated or manually set, as with virtual machines, containers, or MAC-randomizing operating systems).

The lookup accepts a MAC address in any common format (colon-, dash-, or dot-separated, or with no separators at all), normalizes it, checks the individual/group bit and universal/local bit directly from the first byte — this part is always accurate since it's defined by the IEEE 802 standard itself — and cross-references the OUI against a curated table covering common virtualization platforms (VMware, VirtualBox, Hyper-V, QEMU/KVM, Xen), single-board computers (Raspberry Pi, ESP32/ESP8266), and a selection of popular consumer and networking vendors.

Use this to quickly identify whether a MAC address seen in a router's client list, a packet capture, or a DHCP lease table belongs to a known virtualization platform or common device vendor, or to determine whether an unrecognized MAC is a real, factory-assigned hardware address or a locally administered one (common for VMs, containers, and privacy-focused devices that randomize their MAC).

Instant, fully client-side lookup with no data ever leaving your browser. Note the vendor database covers a curated set of commonly encountered vendors, not the complete IEEE OUI registry (which has roughly 30,000 entries) — a MAC not found in the database simply isn't in this curated set, it doesn't mean the address itself is invalid.