Subnet Calculator

I was catching up on some blogs at Planet SUSE and came across OpenSUSE Linux Rants, a blog I followed for several years when I was using openSUSE instead of Ubuntu.

Scott wrote about iptables and how to block hostile machines at the kernel level.  He then mentioned a cool little tool called Online IP Subnet Calulator.  It would have been nice to have when I was studying for my MCSE back in 1999.

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