Windows 10 dns using unconfigured dns server

General
1

I setup raspberry pi (5) with pi-hole about 6 months ago, all working great, verified all systems requests going thru that system including router. 2 weeks ago added another raspberry pi (1) with pi-hole but as of yet have not configured ant system to use that new system. I noticed that one of my systems a windows 10, is now sending some of it's dns requests to the new dns raspberry pi (1) , but I have not configured any system to use that system. I'm not sure where to go with this...

pi@raspberry5:~ $ sqlite3 "/etc/pihole/pihole-FTL.db" "SELECT client,domain,count(domain),status FROM queries WHERE (client == '192.168.x.x') GROUP by domain order by count(domain) desc limit 20"
192.168.x.x|settings-win.data.microsoft.com|1400|1
192.168.x.x|v10.events.data.microsoft.com|1205|1
192.168.x.x|watson.telemetry.microsoft.com|1189|1
192.168.x.x|github-production-release-asset-2e65be.s3.amazonaws.com|142|2
192.168.x.x|github.com|142|2
192.168.x.x|config.teams.microsoft.com|133|2
192.168.x.x|login.live.com|122|2
192.168.x.x|go.microsoft.com|60|2
192.168.x.x|service.weather.microsoft.com|52|2
192.168.x.x|tile-service.weather.microsoft.com|52|2
192.168.x.x|bn1304.storage.live.com|49|2
192.168.x.x|cp801-prod.do.dsp.mp.microsoft.com|45|2
192.168.x.x|checkappexec.microsoft.com|43|2
192.168.x.x|client.wns.windows.com|37|2
192.168.x.x|fe3.delivery.mp.microsoft.com|37|2
192.168.x.x|ctldl.windowsupdate.com|36|2
192.168.x.x|sls.update.microsoft.com|30|2
192.168.x.x|www.google-analytics.com|30|1
192.168.x.x|fe2.update.microsoft.com|29|2
192.168.x.x|browser.pipe.aria.microsoft.com|27|1

New pihole NO SYSTEM IS CONFIGURED TO USE THIS DNS SERVER

pi@raspberry1:~ $ sqlite3 "/etc/pihole/pihole-FTL.db" "SELECT client,domain,count(domain),status FROM queries WHERE (client == '192.168.x.x') GROUP by domain order by count(domain) desc limit 20"
192.168.x.x|www.google.com|3|2
192.168.x.x|login.live.com|2|2
192.168.x.x|checkappexec.microsoft.com|1|2
192.168.x.x|cp801-prod.do.dsp.mp.microsoft.com|1|2
192.168.x.x|fe3.delivery.mp.microsoft.com|1|2
192.168.x.x|kv801-prod.do.dsp.mp.microsoft.com|1|2
192.168.x.x|licensing.mp.microsoft.com|1|2
192.168.x.x|mail.xxx.com|1|2
192.168.x.x|settings-win.data.microsoft.com|1|1
192.168.x.x|watson.telemetry.microsoft.com|1|1
192.168.x.x|wdcp.microsoft.com|1|2
2

If your Win10 PC is configured to automatically acquire IP details through DHCP, below one will show which DHCP server pushed the DNS settings to your Win10 setup:

C:\>ipconfig /all
[..]
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 10.0.0.11(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : zondag 28 juli 2019 18:52:30
   Lease Expires . . . . . . . . . . : maandag 29 juli 2019 18:52:30
   Default Gateway . . . . . . . . . : 10.0.0.1
   DHCP Server . . . . . . . . . . . : 10.0.0.2
   DNS Servers . . . . . . . . . . . : 10.0.0.2
[..]