What Is DNS

This article explains what DNS (Domain Name System) is and how it works when you access a website. It helps you understand how domain names connect to websites, so you can better identify and troubleshoot common issues such as websites not loading or incorrect page results. 

 

What is DNS 

DNS, or Domain Name System, is a service that translates a domain name (such as yourdomain.com) into an IP address (a series of numbers like 192.0.2.1) that computers use to identify each other on the internet. 

Instead of remembering complex numerical IP addresses, DNS allows you to use easy-to-remember domain names to access websites. 

 

How does DNS work 

When you enter a website address in your browser, DNS works behind the scenes to find the correct IP address. This process happens in a few steps: 

1. You enter a domain name. 
   For example, you type yourdomain.com into your browser.  
    
2. Your device checks for a cached record. 
   Your browser or device first checks if it already knows the IP address from a previous visit.  
    
3. A DNS request is sent to a resolver. 
   If the IP address is not found locally, your device sends a request to a DNS resolver (usually provided by your internet service provider).  
    
4. The resolver queries the Root Name Servers. 
   The root name servers are the starting point of the DNS system. They direct the resolver to the correct Top-Level Domain (TLD) servers (e.g., .com, .net). 
    
5. The resolver queries the TLD servers. 
   The TLD servers then point the resolver to the authoritative name servers for the specific domain.  
    
6. The resolver queries the Authoritative Name Servers. 
   The authoritative name servers contain the actual DNS records (such as the IP address) for the domain and return the correct information.  
    
7. The website loads. 
   Once the IP address is found, your browser connects to the server where the website is hosted, and the website is displayed. 

 

Why DNS is important 

DNS is essential for accessing websites and online services. Without it: 

• You would need to remember IP addresses instead of domain names. 
• Websites would not load properly. 
• Email and other services linked to domains may stop working.