Flush DNS benefits (why DNS Flush)

DNS transforms domain names into IP addresses. … sometimes it needs to forget DNS information from cache. That is why dns flush is requires.

How long time DNS cach last : approximately 48 hours.

How to disable DNS Cache

Disabling the DNS Cache in the Current Session

Launch the Command Prompt with administrative privilege , locate to c:\widnows\system32   and execute the below command :

net start dnscache



Disabling the DNS Cache for an Indefinite Period

In Windows  Run dialog (Windows-R) box, type services.msc and press enter. Double-click “DNS Client” in the Services list, click the “Startup type” menu, select “Disabled,” and then click “OK”. There may be some performance issue, you should check after disabling the DNS Client.

Disabling DNS permanently


 Firefox DNS cache delete

Press Alt+H to get the History menu, select Clear Recent History and check all boxes. Under Time range to clear select Everything (except passwords, if desired) and click Clear Now.











Google Chrome DNS cache delete

Expand the Wrench Icon in the upper right corner and select History and check all boxes. Under Clear data for this time period, select Everything(except passwords, if desired) and click Clear Browsing Data.









Deleting DNS Cache – Google Chrome (Mac)

Under Go to the Chrome menu, select Clear Browsing Data and check all boxes (except passwords, if desired). Under Clear data for this time period, select Everything and click Clear Browsing Data.


MacOS 10.7 and 10.8 :

1. Click Applications.
2. Click Utilities.
3. Double-click the Terminal application.
4. Type the following command:sudo killall -HUP mDNSResponder
Important Information: To run this command, you will need to know the computer’s Admin account password.






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