CIDR / Subnet Calculator
Break down any IPv4 CIDR block into its network address, broadcast address, subnet and wildcard masks, usable host range, and total address count — instantly, entirely in your browser. Enter an address with a prefix like 192.168.1.0/24 and the calculator derives every related value using standard bitwise subnet math.
Useful for planning VLANs, firewall rules, and cloud VPC subnets without reaching for a spreadsheet or an external calculator that logs your queries. Network engineers and students both use CIDR notation daily, but manually converting between prefix length, subnet mask, and host counts is error-prone — this tool removes that arithmetic entirely.
Typical use cases: sizing a subnet for a new office VLAN, verifying a cloud provider's VPC CIDR range before deployment, or checking whether two subnets overlap.
Results update live as you type, so you can experiment with different prefix lengths and immediately see the trade-off between network size and host capacity.