Overview

Your DNS cache stores the locations (IP addresses) of web servers that contain web pages which you have recently viewed. If the location of the web server changes before the entry in your DNS cache updates, you can no longer access the site.

If you encounter a large number of HTML 404 error codes, you may need to clear your DNS cache. After you clear your DNS cache, your computer will query nameservers for the new DNS information.

How to clear your DNS cache

The following methods allow you to remove old and inaccurate DNS information that may result in 404 errors.

Windows® 8

To clear your DNS cache if you use Windows 8, perform the following steps:

  1. On your keyboard, press Win+X to open the WinX Menu.
  2. Right-click Command Prompt and select Run as Administrator.
  3. Run the following command:
ipconfig /flushdns

If the command succeeds, the system returns the following message:

Windows IP configuration successfully flushed the DNS Resolver Cache.

Windows® 7

To clear your DNS cache if you use Windows 7, perform the following steps:

  1. Click Start.
  2. Enter cmd in the Start menu search text box.
  3. Right-click Command Prompt and select Run as Administrator.
  4. Run the following command:
ipconfig /flushdns

If the command succeeds, the system returns the following message:

Windows IP configuration successfully flushed the DNS Resolver Cache.

Windows XP®, 2000, or Vista®

To clear your DNS cache if you use Windows XP, 2000, or Vista, perform the following steps:

  1. Click Start.
  2. On the Start menu, click Run....If you do not see the Run command in Vista, enter run in the Search bar.
  3. Run the following command in the Run text box:
ipconfig /flushdns

If the command succeeds, the system returns the following message:

Successfully flushed the DNS Resolver Cache.

MacOS® 10.10.4 and above

To clear your DNS cache if you use MacOS X version 10.10.4 or above, perform the following steps:

  1. Click Applications.
  2. Click Utilities.
  3. Click Terminal.
  4. Run the following command:
sudo killall -HUP mDNSResponder

If the command succeeds, the system does not return any output.

Warning:
To run this command, you must know the computer's administrator account password.

MacOS 10.10.1, 10.10.2, and 10.10.3

To clear your DNS cache if you use MacOS X version 10.10 through 10.10.3, perform the following steps:

  1. Click Applications.
  2. Click Utilities.
  3. Click Terminal.
  4. Run the following command:
sudo discoveryutil mdnsflushcache

If the command succeeds, the system does not return any output.

Warning:
To run this command, you must know the computer's administrator account password.

MacOS 10.7, 10.8, and 10.9

To clear your DNS cache if you use MacOS X version 10.7, 10.8, or 10.9, perform the following steps:

  1. Click Applications.
  2. Click Utilities.
  3. Double-click Terminal.
  4. Run the following command:
sudo killall -HUP mDNSResponder

If the command succeeds, the system does not return any output.

Warning:
To run this command, you must know the computer's administrator account password.

MacOS 10.5 and 10.6

To clear your DNS cache if you use MacOS X version 10.5 or 10.6, perform the following steps:

  1. Click Applications.
  2. Click Utilities.
  3. Double-click Terminal.
  4. Run the following command:
sudo dscacheutil -flushcache

If the command succeeds, the system does not return any output.

Warning:
To run this command, you must know the computer's administrator account password.

iOS Devices


Press and hold both the Sleep/Wake and Home buttons for at least 10 seconds, until you see the Apple logo.

Google Chrome Browser

This method can be used for the Chrome browser regardless of the operating system.

  1. Start Google Chrome.
  2. In the address bar, type chrome://net-internals/#dns. Google Chrome displays a list of hosts in its internal DNS cache.
  3. Click Clear host cache.
  4. In the address bar, type chrome://net-internals/#sockets.
  5. Click Close idle sockets, and then click Flush socket pools.

For Webmasters/Developers

DNS cache can be cleared on the client-side, but the same can be done on DNS Serves as well to speed up the DNS Propagation process. It can be achieved in the following ways:

Public DNS services like Google, Cloudflare, OpenDNS, VeriSign enable users to request a DNS flush for specific domains.

Google Public DNS:

  1. Visit Google's Public DNS Flush Cache page.

Cloudflare Public DNS

  1. Visit the Cloudflare purge Cache page.

OpenDNS PublicDNS

  1. Visit the OpenDNS Cache check page.
  2. It will display DNS results from its multiple server locations. At the bottom, press the Refresh The Cache button to clear the DNS cache.

VeriSign PublicDNS

  1. Visit the VeriSign DNS Flush Cache page.
  2. Enter the domain and validate CAPTCHA and press the REFRESH CACHE button.

Reduce TTL

  1. TTL can be defined in your DNS settings. DNS servers respect TTL and reducing TTL can speed up the process of DNS propagation when changing servers IP's of a web application.
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