How to Do a DNS Flush
The Domain Name System (DNS) is a system that maps numeric IP addresses to friendly names. Examples include mapping a fully qualified domain name of a website, such as www.microsoft.com, to its public Internet protocol (IP) address, or mapping the name of a printer on a local area network to a private IP on the LAN. DNS records have a Time To Live (TTL) that is equivalent to an expiration, and will typically be cached after being looked up for the duration of the TTL. Sometimes it is necessary to clear a cached record to force the client to look up the value again before the TTL expires.
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Instructions
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Click the Windows "Start" menu, expand "All Programs," then expand "Accessories."
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Click "Command Prompt" to launch a new Command Prompt window.
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Type "ipconfig /flushdns" within the Command Prompt window.
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Press "Enter" to run the command. A message will return that says "Successfully flushed the DNS Resolver Cache." This indicates that the DNS cache has been flushed. New DNS lookups will be performed against the DNS server.
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