EncryptCodecCIDR Calculator
Enter an IPv4 CIDR block to compute the network and broadcast addresses, subnet mask, host range, and address counts.
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Network address
192.168.1.0Broadcast address
192.168.1.255Subnet mask
255.255.255.0Wildcard mask
0.0.0.255First usable host
192.168.1.1Last usable host
192.168.1.254IP range
192.168.1.0 – 192.168.1.255Total addresses
256Usable hosts
254How CIDR Notation Works
CIDR notation writes a network as an address plus a prefix length, e.g. 192.168.1.0/24. The /24 means the first 24 bits identify the network, leaving 8 bits for hosts — that is 256 total addresses, or 254 usable once you exclude the network and broadcast addresses. A /31 is a special point-to-point link with 2 usable hosts and no broadcast, and a /32 represents a single host.