MAC Address Vendor Lookup

How to use this MAC vendor lookup

1. Type or paste a MAC address (like 00:1A:2B:3C:4D:5E).
2. The manufacturer's name appears instantly if it's in the curated list.
3. Useful for identifying unknown devices on your network.

How does vendor lookup work?

The first 3 bytes of a MAC address (called the OUI, Organizationally Unique Identifier) are officially registered to a specific manufacturer by the IEEE, allowing devices to be traced back to their maker.

How the IEEE OUI registry actually works

The IEEE doesn't just hand out MAC address ranges informally — organizations pay a registration fee to be assigned a specific block of addresses, most commonly a full OUI (the first 24 bits, giving the registrant about 16 million possible addresses to assign to their own products) but also smaller block sizes for organizations that don't need that many: an OUI-36 or MA-S registration assigns a smaller slice for companies expecting to produce far fewer devices. This registry is public and searchable, which is exactly what makes vendor lookup by MAC address possible at all — the registration data literally maps address ranges to company names, updated as new registrations are added and occasionally as companies are acquired or renamed.

Why vendor lookup identifies a manufacturer, not a specific device

A common misconception is that a MAC vendor lookup can tell you the model or type of a device — in reality, the OUI only identifies which company registered that specific block of addresses, which is typically the manufacturer of the network interface chip or module itself, not necessarily the company whose brand appears on the finished product. A large company that makes phones, laptops, and smart home devices might use the same OUI across all of them if the same internal networking hardware or manufacturing process is shared, which is why a lookup can confirm "this device is from Company X" without being able to say anything more specific about which of Company X's many products it actually is.

Why the same OUI can show up on unrelated-looking products

It's common to see a MAC vendor lookup return a company name that doesn't obviously match the product in front of you — often because the actual network chip inside a device was made by a specialized component manufacturer and simply resold to many different downstream brands for their own products (a practice sometimes called white-labeling). A budget smart plug from one storefront and a completely differently branded one from another retailer might both use the exact same underlying Wi-Fi chip, and therefore report the chip manufacturer's OUI rather than either retailer's own brand name. Company mergers and acquisitions add another layer of this: an OUI registered years ago by one company can end up associated with whatever company later acquired that business, which a lookup will report as the registered owner even if the acquiring company's name means nothing to you in this context.

Why MAC randomization is making vendor lookup increasingly unreliable

As covered on this site's MAC Address Generator, most modern phones and laptops now randomize their MAC address by default for each Wi-Fi network they connect to, specifically as a privacy measure against location tracking. This has a direct, practical consequence for vendor lookup: a MAC address seen on your home network from a modern phone is increasingly likely to be a randomly generated, locally-administered address rather than the phone's real, manufacturer-assigned one, which means a vendor lookup on it will either return nothing recognizable or won't correspond to the phone's actual maker at all. This is an intentional privacy feature working as designed, not a bug in this tool — for identifying devices on your own network today, MAC-based vendor lookup is considerably less reliable than it used to be before randomization became widespread.

Limitations of this tool

This lookup checks a MAC prefix against a small, curated list of common vendors, not the complete IEEE OUI database, which contains tens of thousands of registered organizations — many legitimate vendors simply aren't included yet. It also can't detect a manually changed (spoofed) MAC address, since spoofing software can set any arbitrary address including one that matches a real vendor's OUI, and it has no way to distinguish a genuine manufacturer-assigned address from a randomized, locally-administered one increasingly common on modern devices. Treat a vendor match as a helpful hint for identifying an unknown device, not as definitive proof of what that device actually is.