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HowTo: Find Out DNS Server IP Address Used By My Router?

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 Is there Linux, Unix, Apple OS X, or MS-Windows command that I can use get the same information?
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Windows Displaying the Contents of DNS

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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Bash Shell Command to Find or Get IP address

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