Windows XP

1. Go to Start
2. Find command prompt(CMD) OR you can search cmd in Search bar
3. Open the Command prompt
4. Type this command and press Enter: ipconfig/flushdns
5. If the command is successfull, you will see this message: Windows IP configuration successfully flushed the DNS Resolver Cache.

Windows 7

1. Go to Start
2. Find command prompt(CMD) OR you can search cmd in Search bar
3. Right click on Command prompt and select Run as administrator
4. Type this command and press Enter: ipconfig/flushdns
5. If the command is successfull, you will see this message: Windows IP configuration successfully flushed the DNS Resolver Cache.

Windows 8

1. Press Windows+X key to open the menu
2. Right click on Command prompt and select Run as administrator
3. Type this command and press Enter: ipconfig/flushdns
4. If the command is successfull, you will see this message: Windows IP configuration successfully flushed the DNS Resolver Cache.

Mac 10.7 and 10.8

1. Click Applications --> Utilities
2. Open up the Terminal
3. Type this command and press Enter: sudo killall -HUP mDNSResponder

Mac 10.5 and 10.6

1. Click Applications --> Utilities
2. Open up the Terminal
3. Type this command and press Enter: sudo dscacheutil -flushcache