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I recently saw someone use '200.1.2.0/18.' This doesn't make any sense to me. This is a Class C address with a subnet mask of /18. I thought the subnet mask for a Class C had to be at least /24. How exactly does this work?

testandwonder
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    Please tell your teacher (or better his boss) to read that article, including the part about how ***Classes should not be taught***. He/she is extremely lucky, if I were their boss they'd be out of a job for teaching about technologies that the world agreed to never speak of again 20 years ago. – Chris S Sep 06 '13 at 02:03

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That address uses what's called Classless Inter-Domain Routing (or CIDR for short). The class system has largely been abolished due to the rapidly diminishing IPv4 space.

Aaron Mason
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