So far this topic has peaked my curiosity and for some, it could be the answer we are looking for for pc slowing down especially if we just connected to the internet.
It’s a helpful tip that i tried myself. The link of the source is indicated below. But for those who want to get the ball rolling, at the command prompt using administrator powers, type the following command and press Enter.
netstat -abf 5 > d:/activity.txt
The –a option shows you all of the connections and listening ports, the –b option shows you what application is making the connection, and the –f option displays the full DNS name for each connection option for easier understanding of where the connections are being made to. You can also use the –n option if you wish to only display the IP address. The 5 option at the end will poll every 5 seconds for connections to make it more easy to track what is going on, and the results are then piped into the activity.txt file.
I waited for about five minutes and then press Ctrl + C to stop the recording of data.
Once you’ve finished recording data, you can simply open the activity.txt file in your favorite editor to see the results, or you can type activity.txt at the command line to open it in Notepad.
The resulting file will list all processes on your computer (browsers, IM clients, email programs, etc.) that have made an internet connection in the last two minutes, or however long you waited before pressing Ctrl + C. It also lists which processes connected to which websites.
If you see process names or website addresses with which you are not familiar, you can search for “what is (name of unknown process)” in Google and see what it is. It may be a system function you don’t know about or a function of one of your running programs. However, if it seems like a bad site, you can use Google again to find out how to get rid of it.
Source : https://www.howtogeek.com/98601/easily-monitor-your-computers-internet-connection-activity/