Flushing the DNS cache can help resolve internet connectivity issues, update your DNS records, and ensure your system is using the most up-to-date domain name information. This guide will show you how to flush the DNS cache on both Windows and macOS.

1. What is DNS and Why Flush the DNS Cache?

DNS (Domain Name System) translates domain names (like google.com) into IP addresses so your browser can load the websites you visit. Your computer stores these translations in a DNS cache for faster access.

Sometimes, this cache can become outdated or corrupted, causing connectivity issues or preventing you from accessing websites properly. Flushing the DNS cache clears these entries, forcing your computer to get fresh DNS information.

2. How to Flush DNS on Windows

If you’re using Windows, follow these steps:

  1. Open Command Prompt:
    • Press Windows + R to open the Run dialog.
    • Type cmd and press Enter to open the Command Prompt.
  2. Run the DNS Flush Command:
    • In the Command Prompt window, type the following command: ipconfig /flushdns
    • Press Enter.
  3. Verify the Result:
    • You should see a confirmation message that says: Successfully flushed the DNS Resolver Cache.

3. How to Flush DNS on macOS

If you’re using a Mac, the steps differ slightly depending on your macOS version:

  1. Open Terminal:
    • Press Command + Spacebar to open Spotlight Search.
    • Type Terminal and press Enter.
  2. Run the Appropriate DNS Flush Command:
    • For macOS Mojave (10.14) and later, type: sudo killall -HUP mDNSResponder
    • For macOS Sierra (10.12) and macOS High Sierra (10.13), use: sudo killall -HUP mDNSResponder
    • For macOS El Capitan (10.11), use: sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
    • For older versions (e.g., Yosemite or Mavericks), the command may vary slightly: sudo killall -HUP mDNSResponder
    • Press Enter after typing the command.
  3. Enter Your Password:
    • You may be prompted to enter your administrator password. Type it and press Enter.

By following these steps, you can easily flush the DNS cache on your system and potentially resolve any network issues you’re experiencing.