![]() ![]() The OUI is used to identify the manufacturer of the network card, making it easier to track down the origin of a device connected to a network. ![]() It is assigned by the Institute of Electrical and Electronics Engineers (IEEE) to manufacturers of network equipment. On the other hand, OUI (Organizationally Unique Identifier) is a 24-bit number that makes up the first three octets of a MAC address. ![]() This use is common in most IEEE 802 networking technologies, including Ethernet, Wi-Fi, and Bluetooth. I find myself looking up mac addresses semi-regularly, trying to find the vendor behind a device connected to our equipment at a customer’s house, or looking through logs and trying to identify devices attempting to connect to our wireless APs.A MAC (Media Access Control) address is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment. I tend to default to using the MAC / OUI Lookup tool at, but after a few failed attempts, I started looking for source lists after noticing they may not keep their database updated. So, this short post is just to bring attention to a couple of potential useful sources for finding the vendor behind a MAC address. IEEE Registration Authority – Probably “the” database source you’d want to use. You can access the info to the right under the Download section. ![]() Macaddress.io vendor database – This includes data from IEEE’s registry, but also includes information they’ve discovered on their own. They have an API you can tie into if you want. Wireshark OUI Lookup tool Found this and added it to the list. It uses IEEE’s registry plus a number of other sources. They have a regularly-updated printout of OUIs, and that link is on the referenced page (currently labeled ‘Wireshark Manufacturer Database’). I didn’t link to that page directly to save server load - it seems large. ![]()
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