What Does Clear Cache on DNS Server Do?


Scott Campbell

What Does Clear Cache on DNS Server Do?

The Domain Name System (DNS) is an essential component of the internet that helps translate domain names into IP addresses. When you enter a website URL in your browser, the DNS server is responsible for finding the corresponding IP address associated with that domain name. However, sometimes DNS servers store information in their cache, which can lead to outdated or incorrect results.

Clearing the cache on a DNS server is a process where you remove all stored data and force the server to fetch fresh information from authoritative sources. This ensures that any changes made to domain names or IP addresses are immediately updated and reflected accurately for users.

Why should you clear the cache on a DNS server?

There are several reasons why clearing the cache on a DNS server is beneficial:

  • Updated Information: Clearing the cache ensures that you receive the most up-to-date information when accessing websites. It helps avoid situations where you may be directed to an old version of a website or experience issues due to outdated IP addresses.
  • Troubleshooting: If you encounter connectivity problems or errors while accessing specific websites, clearing the DNS cache can be an effective troubleshooting step.

    It eliminates potential conflicts caused by cached data and allows your computer to establish new connections.

  • Performance Optimization: Over time, a large cache can consume significant resources on a DNS server. By clearing the cache regularly, you can free up memory and improve overall performance.

How to clear the cache on different operating systems?


To clear the DNS cache on Windows:

  1. Open Command Prompt: Press Windows + R to open the Run dialog box. Type cmd and press Enter.
  2. Flush DNS Cache: In the Command Prompt, type ipconfig /flushdns and press Enter. This command clears the DNS cache on your Windows system.

Mac OS X

To clear the DNS cache on Mac OS X:

  1. Open Terminal: Go to Applications > Utilities > Terminal.
  2. Flush DNS Cache: In the Terminal, type dscacheutil -flushcache, then press Enter. This command clears the DNS cache on your Mac.

Linux (Ubuntu)

To clear the DNS cache on Ubuntu Linux:

  1. Open Terminal: Press Ctrl + Alt + T.
  2. Sudo Privileges:If not logged in as root, use the command sudo su -
  3. Sudo Password:You will be prompted to enter your password.
  4. Sudo Flush Cache:In Terminal, run the command:
    systemctl restart nscd; sudo systemd-resolve --flush-caches; sudo service dnsmasq restart;

Note: The steps may vary slightly depending on your specific operating system or distribution.


Clearing the cache on a DNS server is an important maintenance task that ensures accurate and up-to-date information for users. By following the appropriate steps for your operating system, you can easily clear the DNS cache and resolve any potential issues related to cached data. Regularly clearing the cache can help improve performance, avoid connectivity problems, and provide a better browsing experience overall.

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