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==Technical explanation== CIDR notation is written as the IP address, a slash, and the CIDR suffix (for example, the IPv4 "<tt>10.2.3.41/24</tt>" or IPv6 "<tt>a3:bc00::/24</tt>"). The CIDR suffix is the number of starting digits every IP address in the range have in common when written in binary. For example: "<tt>10.10.1.32</tt>" is binary "<tt>00001010.00001010.00000001.00100000</tt>", so <tt>10.10.1.32/27</tt> will match the first 27 digits ("<tt><u>00001010</u>.<u>00001010</u>.<u>00000001</u>.<u>001</u>00000</tt>"). The IP addresses <tt>10.10.1.32</tt>β<tt>10.10.1.63</tt>, when converted to binary, all have the same 27 first digits and will be blocked if <tt>10.10.1.32/27</tt> is blocked. As the CIDR suffix increases, the block affects fewer IP addresses (see [[#Table|table of sample ranges]]). CIDR suffixes are not the same for IPv4 addresses as they are for IPv6 addresses; the same CIDR suffix in IPv4 blocks 2<sup>96</sup>=79,228,162,514,264,337,593,543,950,336 times as many addresses in IPv6.
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