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I issued a correction over the weekend and it was fixed on Monday morning. I had errors in Figure A and B where I should have had a 0 in the second octet. If you've downloaded something, please re-download it. Sorry for my mistake!

I also forgot to mention that I have an animated version of the ruler here:
http://www.lanarchitect.net/Designs/SubnetRuler/SubnetRuler.html

The animated ruler shows how it?s possible to map out a very large network.