IPv4 Subnet Calculator
Enter an IPv4 address and CIDR prefix to instantly get the network address, usable host range, broadcast address, subnet mask, and total host count.
Calculate IPv4 Subnet
Enter IP address and CIDR prefix for instant network address, usable host range and more
What is a subnet?
A subnet divides a larger IP network into smaller, logically isolated segments. Subnetting improves performance by converging broadcast traffic and enhances security by isolating host groups.
CIDR prefix (e.g. /24) indicates how many bits identify the network portion. /24 uses 24 bits for network and 8 for hosts, providing 254 usable addresses.
Common CIDR Subnets
Why subnetting matters for operations
Clear subnet design separates management and production traffic. Out-of-band management networks (where BMC, iDRAC, iLO, iBMC and similar interfaces live) are typically on dedicated subnets, so hardware remains accessible even when the production network goes down.