How to Flush DNS on Mac and Windows

To flush or reset DNS on a Mac OS X type the following into terminal and run:

dscacheutil -flushcache


If you have older Mac OS X, this might work for you:

lookupd -flushcache


To flush DNS on any Windows version, click start > Run and type in command:

ipconfig /flushdns


Hope this fixes your DNS issues.

If you have any questions, please ask in comments.