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CIDR notation is written as the IP address, a slash, and the CIDR affix (for example, the IPv4 "<code>10.2.3.41/24</code>" or IPv6 "<code>a3:b:c1:d:e:f:1:21/24</code>"). The CIDR affix is the number of starting digits every IP address in the range have in common when written in binary.
For example: "<code>10.10.1.32</code>" is binary "<code>00001010.00001010.00000001.00100000</code>", so <code>10.10.1.32/27</code> will match the first 27 digits ("<code><u>00001010</u>.<u>00001010</u>.<u>00000001</u>.<u>001</u>00000</code>"). The IP addresses <code>10.10.1.32<
As the CIDR affix increases, the block affects fewer IP addresses (see [[#Table|table of example ranges]]). CIDR affixes are not the same for IPv4 addresses as they are for IPv6 addresses.
