How to Clear DNS Cache: A Step-by-Step Guide

If you're experiencing internet connection issues or problems accessing websites, clearing your DNS cache might help. But what is a DNS cache, and why should it be cleared? In this article, you'll learn how to clear the DNS cache on various operating systems and devices step by step.

What is DNS Cache and Why Should It Be Cleared?

DNS (Domain Name System) cache is a temporary database stored by your computer or device. It keeps records of the IP addresses of previously visited websites to speed up access. However, outdated or incorrect DNS records in the cache can cause connection issues or prevent access to websites. Therefore, regularly clearing the DNS cache is important for resolving connection problems and improving internet speed.

How to Clear DNS Cache on Windows

For Windows users, clearing the DNS cache is quite simple. Follow these steps:

1. Open Command Prompt: Go to the Start menu, type "cmd", right-click on "Command Prompt" and select "Run as administrator".
2. Clear the DNS Cache: In the Command Prompt window, type the following command and press Enter: ipconfig /flushdns
3. Wait for the Confirmation Message: Once completed, you should see the message: "Successfully flushed the DNS Resolver Cache".

These steps will help you clear the DNS cache on your Windows system. You may notice improved website access after this process.

Steps to Clear DNS Cache on macOS

On macOS devices, you can use the Terminal app to clear the DNS cache. Here’s how:

1. Open Terminal: Go to the "Applications" folder via Finder, open the "Utilities" folder, and launch "Terminal".
2. Enter the Correct Command: Depending on your macOS version, use one of the following commands:
   • For macOS Mojave and later: sudo killall -HUP mDNSResponder
   • For macOS Sierra and High Sierra: sudo killall -HUP mDNSResponder
   • For El Capitan: sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
3. Enter Admin Password: When prompted, enter your administrator password and press Enter.

These steps will clear the DNS cache on your macOS device. If you're having trouble accessing websites, following these instructions may help resolve the issue.

How to Clear DNS Cache on Linux Distributions

For Linux users, the steps to clear the DNS cache vary depending on the distribution. Here are general instructions:

1. Open Terminal: Launch the Terminal app on your Linux system.
2. Restart DNS Service: Most Linux distros manage DNS cache using services like nscd (Name Service Cache Daemon) or systemd-resolved. Use the following commands:
   • If using nscd: sudo systemctl restart nscd
   • If using systemd-resolved: sudo systemctl restart systemd-resolved

These commands will clear the DNS cache on your Linux system. Be sure to check the documentation for your specific distribution for any unique commands.

Clearing DNS Cache on Mobile Devices: Tips for iOS and Android

On mobile devices, clearing the DNS cache is often as simple as restarting the device. However, there are additional methods:

For iOS Devices:

1. Toggle Airplane Mode: Go to Settings, turn on Airplane Mode, wait a few seconds, and turn it off again. This can help refresh the DNS cache.
2. Restart WiFi Connection: Turning WiFi off and on can also help clear the DNS cache.

For Android Devices:

1. Reset Network Settings: Go to Settings, then "Backup and Reset", and select "Reset Network Settings". This will clear the DNS cache.
2. Toggle Airplane Mode: Like on iOS, turning Airplane Mode on and off can help clear the DNS cache.

These steps make it easy to clear the DNS cache on your mobile devices. Try these if you're facing internet connection problems.

Frequently Asked Questions

• Is clearing the DNS cache harmful? No, clearing the DNS cache is not harmful. In fact, it can help resolve connection issues.
• How often should I clear the DNS cache? If you're not having issues, there's no need to do it frequently. But if you face connectivity problems, clearing the DNS cache can help.
• Do I need to restart my device after clearing the DNS cache? Usually not, but in some cases, restarting can provide additional benefits.
• Can clearing the DNS cache improve internet speed? If you're experiencing slowdowns due to outdated or incorrect DNS records, clearing the cache might help speed things up.