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dns lookup utility

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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Linux / UNIX: DNS Lookup Command

How do I perform dns lookup under Linux or UNIX or Apple OS X operating systems without using 3rd party web sites for troubleshooting DNS usage?
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