Calculate IP subnets, CIDR notation, wildcard masks, and usable host ranges.
CIDR (Classless Inter-Domain Routing) notation is a method for representing IP address ranges. The number after the slash indicates how many bits are used for the network portion. For example, /24 means the first 24 bits are the network, leaving 8 bits (256 addresses) for hosts.
A subnet mask divides an IP address into network and host portions. A /24 subnet mask (255.255.255.0) means the first three octets identify the network, and the last octet identifies individual hosts within that network.