Advanced IP Scanner

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I work on networks behind other people and have to find what IP's are in use. I have been using the IP Scanner to do this. The only problem I have found is that the program seems to keep a history file. Most of the time I do not care what use to be on the network only what is currently active. Example: say yesterday I scanned a network and found unit 192.168.1.4 as it was active at the time. If I scan it today it will still show the .4 machine even if it's been turned off. Is there a way to clear the history? Or to have the scanner not show inactive devices?

I'm trying to set up a home lab, and decided to run Advanced IP Scanner. So far it's on 20% scanned with over 13000 unknown devices. What could these be?

When I add comments the next time I open Advanced IP Scanner the comments are gone.
I tried "save as", which creates a html file. But this was not a good idea since I cannot open this file via Advanced  IP Scanner.
So the question is: Is there a way to save the comments and keep them "alive"?

Running Advanced IP Scanner 2.5.3850.  My upstairs server shows up twice in the scan, once with IP address x.x.x.103 and once with x.x.x.108.  Two different MAC addresses, as well.  I have one and only one Network Interface, an Ethernet card.  

Can someone explain this to me?  You will be rewarded generously....with more questions!  

Hi, I have a problem with Advanced IP Scanner. Active users using Windows 10 do not appear after scanning the network. Why is this happening? It only shows me the users of Windows 7 or XP, but not in Windows 10. Help.

Edit:

Good morning, you tried to disable the firewall completely in Windows 10 and I still have the same problem. In the domain there are computers that cannot be found by the user. This problem also happens in Windows 7. There are computers in my network that if I see from other computers and those same computers from other computers I don't see them. I don't understand why this is happening. But Firewall is not.