How Do I Clean My DNS Server?


Larry Thompson

How Do I Clean My DNS Server?

The Domain Name System (DNS) is a crucial component of the internet infrastructure. It translates human-readable domain names into IP addresses, allowing your browser to connect to websites. Over time, your DNS server can accumulate unnecessary or outdated entries, leading to slower response times and potential security risks.

Why should you clean your DNS server?

There are several reasons why you should consider cleaning your DNS server:

  • Improved Performance: Cleaning your DNS server can help improve response times and reduce latency in accessing websites.
  • Enhanced Security: Outdated or malicious entries in your DNS cache can lead to security vulnerabilities. Cleaning the server helps mitigate these risks.
  • Troubleshooting: If you’re experiencing issues with accessing certain websites or services, cleaning your DNS server can be an effective troubleshooting step.

Cleaning the DNS server on Windows

If you’re using a Windows operating system, follow these steps to clean your DNS server:

  1. Open Command Prompt as Administrator: Right-click on the Start menu and select “Command Prompt (Admin)” from the context menu.
  2. Flush the DNS Cache: In the Command Prompt, type “ipconfig /flushdns” and press Enter. This command clears the cached DNS entries on your computer.
  3. Restart the DNS Client Service: Type “net stop dnscache” followed by “net start dnscache” in the Command Prompt. This restarts the DNS client service.

Cleaning the DNS server on macOS

For macOS users, here’s how you can clean your DNS server:

  1. Launch Terminal: Go to Applications > Utilities > Terminal or use Spotlight Search to find and open Terminal.
  2. Flush the DNS cache: In the Terminal window, type “sudo killall -HUP mDNSResponder” and press Enter. You may be prompted to enter your password.

Cleaning the DNS server on Linux

If you’re using a Linux distribution, follow these steps to clean your DNS server:

  1. Open a Terminal: Use the keyboard shortcut Ctrl+Alt+T to open a Terminal window.
  2. Flush the DNS cache: In the Terminal, type “sudo systemd-resolve --flush-caches” and press Enter. This command flushes the DNS cache.


Cleaning your DNS server is an essential maintenance task that can improve performance, enhance security, and help troubleshoot network issues. Whether you’re using Windows, macOS, or Linux, following these simple steps will ensure a cleaner and more efficient DNS server.

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