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I appreciate this may be a strange question to ask. Apart from Sort Lists or Match Client lists/Views is there any way for DNS to selectively resolve names based on the subnet or IP from which the client is making the request.

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More information first.... Is this a Windows or Linux DNS server resolving these requests? Single subnet or multi? Static IP addressing, or DHCP?

I followed this writeup for my personal DHCP/DNS configuration:

http://www.semicomplete.com/articles/dynamic-dns-with-dhcp/

This allows both services to run securely on a Linux server.. Create the zones that you want to serve, and you should be OK.
I finally went with Sort Lists! I needed two A records for a single Host each on a different subnet and I had to order the responses based on the subnet the request was made. It isn't as neat and tidy as I would like but I was been driven by our Developers to provide a fix to a problem they hadn't considered.

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