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November 21, 2005

What's a port number?

When connecting to an FTP site, you may be told to use a specific port number. The default port number is 21, but an FTP site administrator can specify a different one. So, what exactly is a port number?

Think of it like this: if an FTP address is like a phone number, then the port number is like an internal extension. A bit more technically, a port is a doorway (or open connection) between programs (in the case of FTP, an FTP client and an FTP server).

Posted by Van K at November 21, 2005 09:00 AM digg this add to del.icio.us add to My Web Furl this page

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