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This question already has an answer here:

I understand basics of how DNS works. My ISP finds out recursively, that my domain xyz.com is assigned with two nameservers:

ns1.xyzprivatens.com ns2.xyzprivatens.com

Then it asks one of those two for the xyz.com IP and communicates with server using this IP.

Now is the interesting question. How IPs for the nameservers themselves are resolved?

marked as duplicate by Evan Anderson, Iain, pauska, Ward, Dave M Jul 9 '13 at 15:52

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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This is done by means of the so-called Glue Records. More information here on SF or on Wikipedia.

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    We normally close these as duplicates rather than answering them – Iain Jul 9 '13 at 8:05
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    I really pondered flagging as dupe, but taking the Q&A format into account, I decided to answer instead - i felt the question was more along the lines of what's needed rather than what's that thing that i know is needed. – Roman Jul 9 '13 at 8:44

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