Restart your computer is th easiest to flush stale DNS cache in your computer.
Or
Windows® XP or 2000
1. Open the Start menu.
2. Go to Run.
3. Type: ipconfig /flushdns
4. Press Enter or Return, and your cache will be flushed.
MacOS®
1. Go to Applications.
2. Go to Utilities.
3. Open the Terminal application.
4. Type: dscacheutil -flushcache
5. Press Enter or Return, and your cache will be flushed
Windows 7 and Vista
1. Open the Start menu.
2. Go to Run. Rt-click on it and 'Run As Administrator
3. Type: ipconfig /flushdns
4. Press Enter or Return, and your cache will be flushed.
