Understanding CIDR notation

Posted on June 15, 2009 by Karl

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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2 Responses to Understanding CIDR notation

  1. Mat Schaffer says:
    June 17, 2009 at 10:25 pm

    I also wrote a CIDR->netmask converter function in bash for use with vpnc:

    http://bit.ly/ARld

    $(()) for math is pretty handy.

  2. Karl says:
    June 21, 2009 at 5:03 pm

    Damn that’s pretty cool Mat.