MAC / OUI vendor lookup
ssid.aiidentifies a device's manufacturer from its MAC address by resolving the first three octets (the OUI) against the full IEEE registry — paste one below. Modern phones, tablets and laptops randomize their MAC per network for privacy; when that happens we tell you exactly why, instead of a blank “unknown”.
How it works
The first three octets of a MAC (the OUI) are assigned to a manufacturer by the IEEE. We resolve them against the full public registry. If the address has the locally-administered bit set, it was generated by the device itself — there's no manufacturer to look up.
Every result cites its source. Data compiled from the IEEE OUI registry.
FAQ
- How do I find the manufacturer of a MAC address?
- Take the first three octets of the MAC address (the OUI, e.g. 00:1A:2B) and look it up against the IEEE's public OUI registry — that's exactly what the tool above does, resolving against the full registry and flagging randomized addresses instead of calling them unknown.
- What does the OUI in a MAC address mean?
- OUI stands for Organizationally Unique Identifier — the first three octets of a MAC address, assigned by the IEEE to the manufacturer that requested the block. It identifies who made the network interface, not the specific device model.
- Why does a MAC address lookup return blank or unknown?
- Usually because the device is using a randomized (locally-administered) MAC address — a privacy feature in iOS 14+, Android 10+ and Windows 11 that generates a fake address per network. There's no real manufacturer to resolve; ssid.ai detects and states this explicitly rather than showing a blank result.