Subnet Calculator
Calculate IPv4 subnets from CIDR notation.
Network address192.168.1.0
Broadcast address192.168.1.255
Subnet mask255.255.255.0
Wildcard mask0.0.0.255
Usable host range192.168.1.1 – 192.168.1.254
Usable hosts254
About Subnet Calculator
Subnet Calculator is a free online tool that lets you calculate ipv4 subnets from cidr notation in seconds — no signup, no software to install, and no watermarks. Everything runs entirely in your browser, so your files and data never leave your device and nothing is uploaded to a server. Whether you need to subnet calculator once or every day, this Network tool works instantly on desktop and mobile and is completely free to use. It's a fast, free alternative for anyone searching for a cidr calculator.
How to use this tool
- 1Enter an IPv4 address and CIDR prefix (e.g. 192.168.1.0/24).
- 2See the network details instantly.
Frequently asked questions
What does the calculator show?
Network address, broadcast address, subnet mask, wildcard mask, usable host range, and total usable hosts.
Does it support IPv6?
This tool focuses on IPv4 subnetting. IPv6 support may be added later.