Classless Inter-Domain Routing

Ip is an identifier for a computer or a device on a network. The ip address is used to identify the computers in a network. An IP address is written as four numbers separated by periods. Within a local network, the ip addresses can be assigned randomly, as long as they are unique, but over the internet you need to register the IP address.

Think what will happen when each mobile phone will have a permanent connection to the internet. How many mobile phones are in the world ? And that isn't everything, in short time almost every device will have a connection to the internet. A CIDR IP address consist of a IPv4 address followed by a slash and a number from 0 to 32. This number is the prefix length, the number of shared initial bits. The IPv4 address is 32 bit long, so, if a CIDR address is followed by number 16, this means that the first 16 bits from the IP are shared, in other words, 256 class C, equivalent to 1 class B. A CIDR address with 24 in the end is equivalent to 1 class C, or 256 hosts. In this way the internet will never run out of IP addresses.

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