How to clear the DNS cache on Windows

How to clear the DNS cache on Windows

DNS is a service that looks up domain name (alwaysnetworks.co.uk) and resolves it to an IP address (94.237.56.107). This is useful because computers talk in numbers but names are easier for humans to deal with.

Windows caches DNS requests - this means that each time is asks for a DNS resolution it stores the answer locally. This is great, as it saves time - there's no point asking for the same information 100 times.

In some circumstances, the DNS may have changed. This is particularly relevant when you move a website from one host to another for example.

You can force Windows to clear the cache and make sure it requests the latest information. This is done on Windows 10 by following these steps:

  1. Right click on the start button.
  2. From the menu that appears, choose "Windows PowerShell". If this isn't available, choose "Command Prompt".
  3. In the window that pops up, enter the following command and press enter:
  1. ipconfig /flushdns
You should be presented with an output that says "Successfully flushed the DNS resolver cache"


Flushing the DNS cache on Windows doesn't necessarily guarantee the most up to date information. DNS can be cached on your router, or even with your ISP. DNS can take up to 48 hours to propagate around the Internet fully.

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