Subnet Calculator

A subnet calculator helps you turn an IPv4 address and prefix into the network details that matter: network address, broadcast address, subnet mask, wildcard mask, host range, and total usable hosts. Instead of doing bit math by hand, you can enter a value such as 192.168.1.0/24 or an IP plus subnet mask and get an immediate breakdown.

Why this tool is useful

This is useful when you are planning LAN segments, configuring routers and firewalls, documenting infrastructure, or studying for networking exams. The calculator shows the practical details you usually need during real work, including first and last usable hosts and how many addresses are available inside the subnet.

The binary view also helps you understand where network bits stop and host bits begin. That makes the tool helpful not only for production tasks, but also for learning CIDR, subnetting, and address allocation.

Included subnet splitter

The built-in subnet splitter lets you divide a larger network into equal subnets and review each resulting range. That is handy for VLAN planning, environment separation, lab setups, and capacity planning.

Common use cases

• Check the real boundaries of a CIDR block
• Confirm a subnet mask or wildcard mask
• Plan equal subnet splits for teams or environments
• Review usable host counts before deployment
• Learn subnetting with a binary visual aid

Everything runs locally in the browser, so no network information is sent anywhere.