A. How to Flush and Reset the DNS Cache in Windows 10

Flushing the DNS resolver cache can help resolve DNS related problems in Microsoft Windows 10. Issues would include web site not found errors or not being able to view certain web pages that have changed.
To reset the DNS resolver cache, perform the following steps:

1. Hold down the Windows key and press “R” to bring up the Run dialog box.
2. Type ipconfig /flushdns then press “Enter“. (be sure there is a space before the slash)

That’s all there is to it. A command box will flash on the screen for a split second and the DNS Resolver cache is cleared.

B. Windows 8/ Windows 8.1 DNS Flush

Because of the system security policies run cmd as administrator user and follow below steps to flush DNS cache

1. Press Windows key + X and select the Command Prompt (Admin) option from the Power User menu.
2. Type in the command ipconfig /flushdns

C. Windows Vista / Windows 7 Flush DNS

To flush DNS on upgraded version of Windows is almost as easy as it is in the previous versions but due to Microsofts upgraded security system requirements you must run the command prompt with administrator privileges.

1. To flush DNS through the command prompt, navigate as shown (Start > All Programs > Accessories > Command Prompt)
2. to have administrator privileges you must do right click on the command prompt application and choose “Run as Administrator”
3. Type in the command ipconfig /flushdns