How to use iperf to test local network LAN speed in Windows 10

This video will show you how to use iperf to test your local network (LAN) speed in Windows 10. You will need 2 computers on the same network, and the IP Address of one of them.

First, go to iperf.fr/iperf-download.php and download the newest version of iperf for you operating system.

The file that will download is a zip file, so you will need to right click on it and choose extract all. This will create a folder in the same directory with the name iperf-3.1.3-win64 (or the same name as whichever version you downloaded).

Go into this folder, and find the iperf application. You will need to hold shift and right click in the folder, and there will be an option for either Open Command Windows here or Open Powershell here. Click on that and a window will open.

On the first computer, you will need to find the IP address, and then run iperf as a server.

To find the IP address, type ipconfig and then hit enter. In the text that pops up, look for the line under your network adapter that says IPV4 address, the IP should look something like 192.168.1.120.

Next, if you are in powershell (the blue window) type ./iperf3.exe -s and hit enter. If you have the command prompt open, DON'T put in the ./ so just type iperf3.exe -s and hit enter.

Next, go the other computer, download and extract iperf, and then shift+right click and open the Powershell/command prompt.

If the window is powershell (blue window) type ./iperf3.exe -c 192.168.1.120 where 192.168.1.120 is replaced by the IP address of the computer you are running the iperf server on. Again if you are running command prompt instead, just don't include the ./

This will run several speed tests and give the average of them. If you have good gigabit equipment and wiring, the result should be around 950Mbs. If you only have 100Mbs, then you will probably see 90-95Mbs, and if you are on WIFI, then you it all depends on signal strength and type (Wireless G, N, AC, etc)

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