Windows Vista / 7
To flush your DNS cache, you must be logged in as an Administrator.
Step 1. Click Start, and in the search box enter "cmd". - If UAC is enabled on your computer, right click on cmd.exe, click "Run as Administrator", then enter your Administrator login details. - If UAC is disabled, click on cmd.exe.
Step 2. Enter "ipconfig /flushdns"
Windows (all others)
Step 1. Click Start, Run, and enter "cmd".
Step 2. Enter "ipconfig /flushdns"
Linux
Step 1. In the terminal, enter "/etc/rc.d/init.d/nscd restart"
Mac
Step 1. In the terminal, enter "dscacheutil -flushcache"