How to clear your DNS cache
The following methods allow you to remove old IP address that store on your system which it might be inaccurate DNS information that may result in 404 errors or display the wrong web content.
Windows® 8

1. Press Win+X to open the WinX Menu.
2. Right-click on Command Prompt and select Run as Administrator.
3. Type the following command and press Enter: ipconfig /flushdns

If the command was successful, you will see the following message:
Windows IP configuration successfully flushed the DNS Resolver Cache.
Windows 7

1. Click the Start button.
2. Enter cmd in the Start menu search field.
3. Right-click on Command Prompt and select Run as Administrator.
4. Type the following command and press Enter: ipconfig /flushdns

If the command was successful, you will see the following message:
Windows IP configuration successfully flushed the DNS Resolver Cache.

Windows XP, 2000, or Vista®

1. Click the Start button.
2. On the Start menu, click Run….
3. If you do not see the Run command in Vista, enter run in the Search bar.
4. Type the following command in the Run text box: ipconfig /flushdns

MacOS® 10.7 and 10.8

1. Click Applications.
2. Click Utilities.
3. Double-click the Terminal application.
4. Type the following command: sudo killall -HUP mDNSResponder

ALERT! Warning: To run this command, you will need to know the computer’s Admin account password.
MacOS 10.5 and 10.6

1. Click Applications.
2. Click Utilities.
3. Double-click the Terminal application.
4. Type the following command: sudo dscacheutil -flushcache