ipconfig command

My router configured by ISP tech and it is set to get DNS server address automatically from upstream. Is there is a way to find out the IP address of the dns server used by my router which is located at 192.168.1.1? Is there Linux, Unix, Apple OS X, or MS-Windows command that I can use get the same information?

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Q. How do I display the contents of my DNS client resolver cache under Windows server 2000 / 2003 / 2008 / XP / Vista operating systems?

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How do I find out my Linux / UNIX system ip address, subnet and related networking information from a command prompt?

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