host 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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I am a new Linux and command line user. How do I use host command line utility to verify DNS settings on Linux and Unix-like operating systems? How do I use dig command to find the IP address of a host name or host Name of an IP address?

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