This means that the last 8 bits of the IP address are reserved for host IP addresses, thus IP addresses 192.168.0.15 through 192.168.0.255 will be allowed as host IP addresses on the network. This means that the first 24 bits of the IP address are reserved for network routing. 192.168.0.15 defines the address prefix, and /24 defines the number of bits reserved for the netmask. To understand what CIDR notation means, take the IP address 192.168.0.15 and the /24 CIDR, for example. CIDR accomplishes the same task as traditional subnet masking. It enables network administrators to group blocks of IP addresses into single routing networks.
The following table details how many networks and IP addresses are allowed with each CIDR length and equivalent subnet masks.ĬIDR stands for Classlesss Inter-Domain Routing. CIDR defines which IP addresses, and how many host IP addresses will be allowed on the network. CIDR notation accomplishes the same task as network subnet masking.
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