If using IIS on Windows you can go to the Directory Security tab under Properties of your domain. And select Deny Access and specify the IPs or domain names that you want to block also.
Good post Lucifer. Its an easy thing to do, but often overlooked.
One note, just make sure you enter the information correctly. I don't know how many times I've had to go digging through access lists and records to find out that one number was off, or a period was in the wrong spot which denied the wrong people from accessing the site.
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In the Absence of Information People Make Things Up.
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