Flush DNS function is to make a change on the computer to be accomodate change information that some settings changed or modificated at Domain, NameServer, DNS And the Website not yet seen for newest design or data data after updated although we have Refreshed Browser few times.

The DNS Modification conducted for example, a domain have been expired so the DNS domain changed ton DNS default from domain registrar (hosting provider). To change NameServer, actually need maximum 48 hours to resolved the domain to new NameServer (we call propagation). If we are doing WHOIS domain before propagation time, we will view the old information data, so FLush DNS is needed to resolving this case. By doing Flush DNS, we don’t have to wait until 48 hours, just few minutes, that great!

Conclusion:
Flush DNS will be deleting old record data regarding Domain information and NameServer record in Your computer Chache so that the new update is seen. Not data that saved in the computer chache.

How to Flush DNS?

Flush DNS in Microsoft Windows
Start -> Run -> type: cmd
After command prompt showing, type: ipconfig /flushdns

Example:
C:\>ipconfig /flushdns
Windows IP Configuration

Successfully flushed the DNS Resolver Cache.


Flush DNS in Mac OSX Leopard
bash-2.05a$ dnscacheutil -flushcache

If You are using Mac OSX versions 10.5.1 or older, You have use command:
bash-2.05a$ lookupd -flushcache

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Flush DNS in Linux
Flush DNS in Linux machine, You have to restart nscd daemon.
Command to restart nscd daemon:
/etc/rc.d/init.d/nscd restart

Good Luck!