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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

WINDOWS:
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.

Mac OS:

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.