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Free Subnet / CIDR Calculator
Calculate network address, broadcast, usable host range, subnet mask, and host count from any IPv4 address and CIDR prefix.
Runs in your browserNo sign-up, no pop-upsNo login requiredFree forever
/
/0/8/16/24/32
254
Usable hosts
256
Total addresses
Network address192.168.1.0/24
Usable host range192.168.1.1 β 192.168.1.254
Broadcast address192.168.1.255
Subnet mask255.255.255.0
Wildcard mask0.0.0.255
Mask (binary)11111111.11111111.11111111.00000000
IP classC
Address typePrivate (RFC 1918)
IPv4 subnetting reference. /31 and /32 are handled per RFC 3021 (point-to-point and single-host). All math runs locally in your browser.
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How It Works
1
Enter
Enter your text or data.
2
Process
Processed instantly in your browser. No server, no waiting.
3
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Save your result. Nothing is stored.
Why use ours?
βCompletely free β no hidden costs, ever
βNo account, email, or login required
βRuns entirely in your browser β no uploads
βWorks on any device β phone, tablet, desktop
βOpen and ad-supported, with no tracking
βLoads fast, with no installation needed
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