Actually yes it would. Remember that scripts and Java applets are local, not remote. In theory a script/applet can read the systems IP address and send it to the remote web server.
Problem with banning IP addresses though is most of them are dynamic. Users that use the same ISP as the banned soul might lose access if they happen to get the banned IP address. You can block the whole ISP subnet, but that's a little harsh in my book.
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