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Re: HOWTO: Understand Binary and Subnetting
by Jason on Sunday November 20, @08:21AM
I agree that it's strange to eliminate the first and last subnet range. The simple answer to your statement is that it's the rule dictated by a lot of router hardware. However, these days those addresses can be used on some router gear. For example Cisco refers to this feature as ip subnet zero on their routers and in recent Cisco IOS versions it is now turned on by default.

I hope this helps clarify.

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