CIDR / Subnet Calculator
networkingCalculate subnet masks, network ranges, broadcast addresses, and host counts.
Part of Nexabit Network Utilities — browser diagnostics by Nexabit IT Solutions. API pricing · Developer login
What this tool does
Calculate subnet masks, network ranges, broadcast addresses, and host counts.
Best for
Planning IPv4 subnets, host ranges, and netmasks.
Common use cases
- VPC and firewall rule planning
- IP address allocation documentation
- Quick validation of CIDR notation in change requests
CIDR / Subnet Calculator
Enter CIDR notation (e.g. 192.168.1.0/24). Results update as you type.
Examples: 10.0.0.0/8 · 172.16.0.0/12 · 192.168.1.0/24
Results
Valid
Network 192.168.1.0/24
Network
192.168.1.0/24
Subnet Mask
255.255.255.0
Usable Hosts
254
Total Hosts
256
- Broadcast
- 192.168.1.255
- First Host
- 192.168.1.1
- Last Host
- 192.168.1.254
- Wildcard Mask
- 0.0.0.255
Frequently Asked Questions
CIDR / Subnet Calculator is a browser-based utility on Nexabit Network Utilities. Calculate subnet masks, network ranges, broadcast addresses, and host counts.
A /24 provides 256 addresses (254 usable hosts when network and broadcast addresses are reserved in typical IPv4 deployments).
CIDR / Subnet Calculator can be used in your browser without a developer account. Programmatic access via the Developer API requires a logged-in account and an active API plan — see /pricing.
CIDR / Subnet Calculator is part of Nexabit Network Utilities, built and maintained by Nexabit IT Solutions.