ToolStaxx guide
IPv4 subnet calculator explained
Understand network address, broadcast address, usable range and host count from an IPv4/CIDR value.
Quick answer
Understand network address, broadcast address, usable range and host count from an IPv4/CIDR value.
How to do it
- CIDR prefix defines the subnet mask.
- The network and broadcast addresses frame the usable range for common subnets.
- Use the calculator for planning notes before configuring routers or firewalls.
Worked example
192.168.1.25/24 gives network 192.168.1.0, broadcast 192.168.1.255 and 254 usable hosts.
Common mistakes
- Confusing gateway address with network address.
- Forgetting /31 and /32 behave differently.
- Mixing decimal and binary subnet assumptions.
When this is not suitable
Do not paste secrets, passwords or private keys into web tools. Check live configurations before applying changes.
Related next tools
Next useful tech and file tools for this task.
Keep the result together
Use the calculator first, then add the result to a Project Sheet if you need a clean printable summary.
Open Project Sheet Builder