IP & Subnet Tools
Subnet Calculator (IPv4)
Enter an IP with a CIDR prefix (or a netmask) to get every detail of the subnet.
📖 New to this? Read Understanding Subnets and Subnet Masks.
Example
192.168.1.0/24 → network 192.168.1.0, broadcast 192.168.1.255, mask 255.255.255.0, and 254 usable hosts (192.168.1.1–192.168.1.254).
❓ Frequently Asked Questions
What is the Subnet Calculator (IPv4) used for?
Calculate the network, broadcast, host range, netmask, wildcard, and usable hosts for any IPv4 subnet.
Is the Subnet Calculator (IPv4) free and private?
Yes — it's completely free and runs entirely in your browser. Whatever you enter stays on your device and is never uploaded to any server.
Do I need to install anything to use the Subnet Calculator (IPv4)?
No. It works in any modern web browser on desktop, tablet, or phone — no downloads, no browser extensions, and no account required.