CIDR Calculator

Compute network, broadcast, range and host count for any CIDR block.

Enter a CIDR block like 192.168.1.0/24 to get the network address, broadcast address, usable host range, total addresses, and prefix details for both IPv4 and IPv6.

Related tools

CIDR to IP RangeConvert a CIDR block to its start and end IP addresses.IP Range to CIDRFind the minimal CIDR blocks that exactly cover an IP range.Subnet CalculatorCalculate subnet masks, wildcard masks and host counts for IPv4 networks.

Frequently asked questions

What does the /24 mean?

The /24 is the prefix length — the number of network bits. It means the first 24 bits are fixed, leaving 8 bits (256 addresses) for hosts.