Header slot HTML

CIDR / Subnet Calculator

Calculate subnet mask, range, broadcast, and host count for an IPv4 CIDR block.

Free
In-content slot
Input
Enter a CIDR and click Calculate.
Results
FAQ

1) Enter an IPv4 CIDR block (e.g. 192.168.1.0/24).
2) Click Calculate.
3) Review network range, mask, broadcast, and host count.
4) Copy results as needed.

Yes. FreezeBit tools are free to use.

No. Most tools run locally in your browser. We do not store your input unless explicitly stated.

Yes. Each tool has its own URL—bookmark it or share it with anyone.

CIDR is a notation like 192.168.1.0/24 defining a network and prefix length.

The last address in the subnet, used to reach all hosts.

/31 for point-to-point links, /32 for a single host route.

Not yet. We can add an IPv6 calculator later.
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Privacy
We don’t store your input on our servers. Most tools run locally in your browser.