How dns servers work know the ip address of website?

Question

My question is that suppose my website is \"xyz.com\" I can access it anywhere in the world, but I\'m curious to know how does all the dns servers know the ip address of my

Answer 1

That's why there are DNS Root Servers.

At the top of the DNS system are DNS root servers. There are approximately 500 root servers distributed around the planet, addressed via 13 IP addresses. These root servers are the only ones that contain the entire list of all domain names and IP addresses. So eventually, a DNS request might make it all the way to the DNS root servers if no other DNS server has the answer. If there is still no answer at the root level, then the DNS request fails, and your browser returns an error. Source

Answer 2

The main process that resolves an IP Address through DNS is referrals. A DNS Server will go through a process to find the Authorative Nameserver for your domain. The Authorative Nameserver is the server that is configured to answer queries for that domain. i.e. the godaddy DNS Servers, if you have purchased, and configured a domain name through them.

If you go to www.example.com from your PC, it will send a query to your configured DNS server, asking for www.example.com

If your configured DNS Server knows that answer already, i.e. it has been asked the same question recently, it will return the answer from cache (as long as it hasn't expired)

If your configured DNS Server doesn't know, then it will find out. In order to find out what server knows the answer, it needs to look up the name server for example.com first.

So the first query the nameserver makes is to the root domain "." (All DNS Servers should have these configured) to find out the nameservers for the .com domain.

When it has an address for the .com domain's nameservers, it will send a query asking for the nameserver for example.com

when it has the address for example.com's nameservers, it will send the original query, for www.example.com, to that server, and return the answer to you (and put a copy in its cache incase anyone else asks)

Note: If you were looking for www.test.example.com then it would have asked example.com for the nameservers for test.example.com instead.

Answer 3

• URL resolution in DNS happens from right to left.
• DNS comprises of Root Servers, Top Level Domain(TLD) and Authoritative Servers

For the example www.example.com :

• Root Server queries the TLD for '.com' extension
• TLD searches the DNS cache for the domain, if not it queries the corresponding authoritative server for the domain 'example.com' to finally get the IP address for the host www.example.com, then return that IP address to your computer.

Answer 4

When a request comes in the name server can do the following four thing with it. (1)It can answer the request with the IP address because it already the IP Address. (2)It can contact another name server and try to find the ip address for the name requested. It may have to do this with multiple times. (3)I t can say “ I don’t know the IP address for the name you requested. But here is the IP address for the name server that know more than I do. (4)It can return Error message the requested domain is invalid or does not exist.

for more explanation read full article here

https://www.computersciencejunction.in/2019/04/domain-name-system-introduction.html