Flushing the DNS on Windows and Apple machines

Occasionally it is necessary to flush the DNS, in order to remove any bad or cached routes. Both Windows and Apple computers have commands built into the operating system to perform this function.

Windows XP:
1. Click Start and Run... A small window should appear in the bottom left portion of the screen.
2. In the available text box, enter ipconfig /flushDNS and click OK.
3. A black box should quickly appear and then disappear. This is normal; your DNS cache has been flushed.

Windows Vista:
1. Click Start.
2. Enter run in the search box, and click the Run command that appears at the top of the list. A small window should appear in the bottom left portion of the screen.
3. In the available text box, enter ipconfig /flushDNS and click OK.
4. A black box should quickly appear and then disappear. This is normal; your DNS cache has been flushed.

Apple OS X / Snow Leopard:
1. Go to the Finder, and click Applications > Utilities > Terminal. A white window with a command prompt should appear.
2. If you have Tiger or below (<=10.4), enter lookupd -flushcache and press Enter. You will not receive any feedback letting you know that it worked, but unless it gave you an error, your DNS cache is flushed.
3. If you have Leopard (Snow Leopard) (>=10.5), enter dscacheutil -flushcache and press Enter. You will not receive any feedback letting you know that it worked, but unless it gave you an error, your DNS cache is flushed.

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