How do I find out which DNS was used by Windows?

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How do I find out which DNS was used by Windows?

My system is using both primary and secondary DNS entries.

The primary DNS is set to my router/gateway address.
The secondary DNS is set to an external DNS service.

This is so the PCs on my local network can resolve local addresses (not even sure if that works properly in a workgroup setting actually, my current router is getting a bit on in age :-) ; but habits die hard I guess)

I'm trying to find a way to figure out exactly which DNS server responded to a request. In other words, when using windows to access a website, I want to know whether windows asked the primary DNS, or whether the primary timed out and a secondary was used. How can I do this?
I've googled around obviously, but google doesn't seem to be able to serve up any answers other than "find out which dns i used", which inevitably leads to sites explaining how to manually set your DNS, or how to check the records for your website, both of which are useless.

Is there any tool that can put out requests via windows itself and then output which of the dns servers responded?