IP Subnet Calculator
Calculate subnet mask, network, broadcast, and usable host range from IPv4 and CIDR.
Enter IP and CIDR
Results
About this tool
IP Subnet Calculator helps you calculate subnet details from an IPv4 address and CIDR prefix. It is useful for network planning, server setup, cloud configuration, firewall rules, and infrastructure troubleshooting. It is designed for quick development tasks such as debugging, formatting, validating, encoding, decoding, and inspecting data.
How to use IP Subnet Calculator
- Enter an IPv4 address such as 192.168.1.10.
- Enter a CIDR prefix such as 24.
- Click Calculate Subnet.
- Review the network address, broadcast address, subnet mask, usable host range, and total hosts.
- Use the sample button to test the calculator quickly.
Why use IP Subnet Calculator?
IP Subnet Calculator helps developers and administrators understand subnet boundaries quickly. It is useful when configuring servers, containers, routers, VPNs, and access rules. This makes it useful when working with APIs, configuration files, logs, databases, web pages, or structured data.
Frequently Asked Questions
What does IP Subnet Calculator do?
It calculates subnet details such as subnet mask, network address, broadcast address, host range, and host counts from an IPv4 address and CIDR prefix.
Does it support CIDR notation?
Yes. You can enter a prefix length from 0 to 32.
Can I calculate usable host ranges?
Yes. The tool shows the first and last usable host addresses when available.
Is IP Subnet Calculator free to use?
Yes. You can use this online tool for free.
Do I need to install anything to use this tool?
No. You can use this tool directly in your browser without installing extra software.
Can I use this tool on mobile?
Yes. This tool can be used on desktop, tablet, and mobile browsers.