How DNS/Web Address Works (Name Resolution Process)

This topic will give you insight that How DNS request travels from Root DNS Server to final DNS Name server.

Below is picture that shows How DNS name(website address) resolves to IP.

DNS TO IP ADDRESS RSOLUTION PROCESS

1. As mentioned in picture when some one try web address www.ku.ac.th, first it need to resolve web address to IP address. For that DNS resolver in our computer check DNS Name Server Resolver IP Address (Eg. 8.8.8.8 open DNS Resolver from Google or your ISP DNS Server IP Address) and send DNS resolving request (of web address www.ku.ac.th) to it.
2. Now DNS Name Server Resolver (like Google 8.8.8.8 or ISP DNS Server) will send reqest to resolve of address www.ku.ac.th to Root Name Server. Root Name Server respond with IP address of th DNS server to our DNS Name Server Resolver. Now our DNS Name Server Resolver send request to th DNS server for address www.ku.ac.th .
3. th DNS Server now respond with address of ac DNS Server to our DNS Name Server Resolver. Now DNS Name Server Resolver send request to ac DNS Server with address www.ku.ac.th . Now ac DNS Server respond with address of ku DNS server to our DNS Name Server Resolver
4. Now DNS Name Server Resolver send request to ku DNS server with address www.ku.ac.th . Now If ku DNS Server has record www in it then it respond with IP address (here IP is 158.102.2.69) to our DNS Name Server Resolver
5. And once DNS Name Server Resolver get IP Address of DNS:www.ku.ac.th then it reply back to our computer DNS resolver. And Once computer DNS resolver get IP our web browser send request to IP of web server with web address(www.ku.ac.th)
6. Here you can see request goes from Root DNS server, th DNS server, ac DNS server, ku DNS server and if record found www on ku DNS server then it resolve IP.