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dns lookup utility

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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