I have a large number of TCP connections open even immediately after a reboot. It's normally around 200 with only Dragon NaturallySpeaking, KnowBrainer, Norton Security and my VoIP phone (X-Lite) along with a few other minor programs and normal Windows 10 background tasks running. I run Malwarebytes regularly and never find anything wrong and have Norton Security set at maximum levels.
I'm attaching a file from TCPviewer that was taken immediately after a reboot as an example.
data.txt 7.04KB 6 downloads