Understanding CIDR notation

Good guides for those that need a quick dive:

Wikipedia: CIDR notation. Terse. Without understanding of IP addressing and subnets worthless. So the following give a better big picture:

Cisco: IP Addressing and Subnetting for New Users

MediaWiki’s guide to blocking ranges: Help:Range blocks

Yahoo! Small Business Help: What is CIDR?

Microsoft: Understanding TCP/IP addressing and subnetting basics

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