Have you ever noticed that some devices in your scan show up with a blank "Network Adapter Company" column? It’s frustrating because you know something is connected, but you have no idea if it’s a laptop, a phone, or a smart toaster.
The reason this happens is simple: Wireless Network Watcher uses an internal database to match MAC addresses to brands. But new gadgets are made every day, and the built-in list can get outdated. The good news? You can manually update this list in seconds using a file called oui.txt. Here is the secret to getting perfect results every time.
What is an OUI File anyway?
OUI stands for Organizationally Unique Identifier. Every tech company (like Apple, Samsung, or Sony) has their own unique codes. The IEEE maintains a master list of these codes. By downloading the latest version of this list, you give Wireless Network Watcher the "knowledge" it needs to recognize even the newest devices on the market.
Step 1: Download the Latest Database
You don't need to hunt for this on shady sites. The official list is hosted by the IEEE. Open your browser and go to this link: http://standards-oui.ieee.org/oui/oui.txt. It’s a large text file, so it might take a moment to load.
Step 2: Save the File Correctlly
Once the page loads, right-click anywhere and choose "Save As." Make sure the file name is exactly oui.txt. This is the only name the software will look for.
Need the Latest Version?
Ensure you are using the official Wireless Network Watcher v2.44 for the best results.
Download Free (Official)Step 3: Move it to the App Folder
Find the folder where you have WNetWatcher.exe. Now, simply copy and paste the oui.txt file you just downloaded into that same folder. They need to live side-by-side to work together.
oui.txt exists. If it finds it, it will use that instead of its old internal list.
Step 4: Restart and Scan
Close Wireless Network Watcher if it was open, and launch it again. Hit the scan button. You should now see that many of those "Unknown" devices suddenly have brand names like "Xiaomi," "TP-Link," or "Hon Hai Precision."
Final Thoughts
Updating your database is a pro move that makes network monitoring much more accurate. I recommend doing this once every few months to keep your identification data fresh. It’s a small tweak, but it makes a huge difference in spotting uninvited guests on your Wi-Fi!