🌐IP Subnet Calculator
Calculate network address, broadcast, hosts, and subnet mask from CIDR notation.
About IP Subnet Calculator
Calculate all subnet details from a CIDR notation input. Enter an IP address with prefix length (e.g. 192.168.1.0/24) to instantly get the network address, broadcast address, subnet mask, usable host range, and total host count. Essential for network planning and configuration.
How to Use IP Subnet Calculator
- 1
Enter CIDR notation
Type an IP address with prefix length, e.g. 10.0.0.0/16.
- 2
Calculate
Click Calculate to compute all subnet details instantly.
- 3
Review results
See network address, broadcast, subnet mask, host range, and count.
Common Use Cases
- Network infrastructure planning and design
- Subnetting exercises and CCNA study
- Firewall rule and routing configuration
- Cloud VPC and subnet configuration
Frequently Asked Questions
What is CIDR notation?
How many usable hosts does /24 give you?
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