Network

Subnet Calculator

Calculate network, broadcast, host range, and mask details from CIDR.

Subnet Calculator derives network address, broadcast, host range, and mask details from CIDR input. It is useful for address planning, firewall rule scoping, and onboarding new segments. The tool reduces manual binary math errors when carving networks. Use it as a fast validation step before provisioning.

Subnet Input

Result

Network: 192.168.10.0/24

Subnet mask: 255.255.255.0

Wildcard: 0.0.0.255

Broadcast: 192.168.10.255

First host: 192.168.10.1

Last host: 192.168.10.254

Usable hosts: 254

How to use this tool

Enter a CIDR block such as `10.20.0.0/24`.
Run the calculator to view network boundaries and host range.
Confirm values match your intended segmentation before deployment.

Network planning tools

Promote network diagram software, certification resources, and infrastructure monitoring tools.

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