is there an easy way to clean DNS cache

is there an easy way to clean the DNS cache or a app or addon to do it ? my reason for this is because a little research everybody recommends to clear the DNS cache before using a VPN or my genuine IP is still seen, or is there anything else i should do before running a VPN to stay anonymous online

 

Open a admin level command prompt window and type "ipconfig /flushdns" less the quote marks.

 

Unless you are using Firefox. Then you may want something like this:
https://addons.mozilla.org/en-US/firefox/addon/dns-flusher/

 

thats why i disabled the stupid dns prefetching (prefetching at all) in firefox
https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections
http://ccm.net/faq/555-disabling-the-dns-cache-in-mozilla-firefox

prefetching causes unnecessary network traffic. in case of slow lines it may has pro's but in general not. dns prefetching is useless in administrated systems with own dns-server. concerning windows with active dns service totally nonsense.

firefox dns cache > windows (OS) dns cache > router dns cache > dns server outside

 

If you use CCleaner you can enable DNS cache cleaning in it's settings.

 

Create yourself a simple batch file. Open notepad:

ipconfig /release
ipconfig /flushdns
ipconfig /renew

Name it what you want with .bat extension.
This will refresh your IP and flush DNS

 

Unless you have a slow internet connection, there is no reason to use DNS Cache at all, it is an obsolete feature from old days.