There are other sites that allow you to search for the vendor of a NIC based on a MAC address, but I decided to make my own. It is nothing fancy, but I don't have the sense to bookmark a site that does this and I am tired of searching for them on google. I figured it would be easy enough and this way I know where it is. Records were updated last on 03/25/2009.
Search by OUI
Enter the first six hex values (OUI) of the MAC address. Acceptable formats include 00:00:00, 00-00-00, and 000000. No other format will work.
Search by Company Name
Enter the company name to find all OUIs of that company.