IP Subnet Calculator
Calculate network address, broadcast address, usable host range, and more from any IPv4 address with CIDR prefix length.
About IP Subnet Calculator
Subnetting divides an IP network into smaller segments. This calculator takes an IPv4 address and CIDR prefix length (e.g., /24) and computes the network address, broadcast address, usable host range, number of hosts, and subnet mask in various formats.
How to Use
Enter an IPv4 address and select a CIDR prefix length (/0 to /32). Click Calculate to see all subnet details. Common prefixes: /24 (256 addresses), /16 (65,536 addresses), /8 (16M addresses).