If you've ever tried to track down an unknown computer on a network and all you have to go on is the IP address, hostname and/or MAC address, any additional information can help save time.
Often, it's helpful to know the manufacturer of the computer's network interface. If you knew it was made by Dell, then you could save a lot of time by just looking for Dell computers.
There's a website that lets you put in the first half of the MAC address and then tells you who the manufacturer of that device is. I've relied on this site for years. Here is the link: