The DNS directory isn't located in one physical place or even one corner of the vast Internet. It's distributed all over the world and stored on many different servers that communicate with one another to regularly provide updates, information, and redundancies.
Where are DNS servers usually located?
These servers reside in your ISP's data centers, and they handle requests as follows: If it has the domain name and IP address in its database, it resolves the name itself. If it doesn't have the domain name and IP address in its database, it contacts another DNS server on the internet.
How do I find the domain name server of a website?
Run ipconfig /all at a command prompt, and verify the IP address, subnet mask, and default gateway. Check whether the DNS server is authoritative for the name that is being looked up. If so, see Checking for problems with authoritative data.