CIDR

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CIDR stands for Classless Independent Domain Routing. It replaced Classes A, B, C networks on the Internet. The CIDR notation counts how many left-most bits are contained in a netmask. So that a class A would be a /8, a class B would be a /16 and a class C would be a /24. A /32 is an individual IP and /0 represents the entire Internet often used with firewalling.


IPv6

An IPv6 CIDR notation is natural because you have a prefix and a prefix length. If the prefix length is 64 then the notation would be fd00:f00::/64 or similar.