How to flush the DNS cache in Windows or Mac OS X?
If you ever need to flush the DNS cache in your computer, do the following:
In Windows:
Open a Command Prompt (for example, click on "Start / Run" and type "cmd")
Type "ipconfig /flushdns"
In Mac OS X:
Open the Terminal.app application (in /Applications/Utilities)
Type "lookupd -flushcache"