Yeah, I looked it up and came up with fdcservers.net too. Seems they provide bandwidth hosting services to businesses so I'm guessing it could be a Microsoft data centre or cloud server.On my system I see that MicrosoftEdge connects to FDCservers = 50.7.X.X (I didn't lookup the IP ranges). So it is evidently a Microsoft related thing.
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You could make it a full-time occupation just studying all of Microsoft IP addresses\URLs and what they do...
That's good to hear. I usually don't keep much of an eye on stuff like this but I thought it was a worrying that it named the block as the actual operating system and not a process or file which is why I was compelled to ask about it.This is understandable. With experience you just get to the point where ... meh... if I don't see it obviously broken, then I'm not going to worry about it. Your system is more vast than you comprehend - and there is always something going wrong on it that isn't readily apparent. It's just the nature of the beast, but that doesn't mean errors and non-visible issues create huge, hidden problems.
If you go crazy constantly auditing your system you will do nothing but keep yourself crazy. Such behavior is all over the security forums.