For Windows

To flush DNS for a computer running Windows, please follow these steps:

 1. On your local machine, open a command prompt.

 2. Within the prompt, type ipconfig /flushdns.

You should see the following message:
Successfully flushed the DNS Resolver Cache.

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For Mac

To flush DNS for a computer running Mac OS, please follow these steps:

 1. On your local machine, open a terminal window.

 2. Within the prompt, type lookupd -flushcache.

To flush DNS for a computer running Mac OS 10.5 Leopard, please follow these steps:

 1. On your local machine, open a terminal window.

 2. Within the prompt, type dscacheutil -flushcache