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<title>CIDR.xyz</title>
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<h1>CIDR.xyz<small>An interactive IP address and CIDR range visualizer</small></h1>
<p><a href="https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing">CIDR</a> is a notation for describing blocks of IP addresses and is used heavily in various networking configurations. IP addresses contain 4 octets, each consisting of 8 bits giving values between 0 and 255. The decimal value that comes after the slash is the number of bits consisting of the routing prefix. This in turn can be translated into a netmask, and also designates how many available addresses are in the block.</p>
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<p>* For routing mask values <= 30, first and last IPs are base and broadcast addresses and are unusable.</p>
<p>Created by <a href="https://yuv.al">Yuval Adam</a>. Source available on <a href="https://github.com/yuvadm/cidr.xyz">Github</a>.</p>
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