Calculate /24 subnet
cidr = 192.168.1.0/24
Result: Network: 192.168.1.0, Broadcast: 192.168.1.255, Usable hosts: 254
Subnet Calculator
Enter a CIDR notation (e.g. 192.168.1.0/24) to calculate the network address, broadcast address, host range, subnet mask, and number of usable hosts.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation uses an IP address followed by a slash and prefix length (e.g. 192.168.1.0/24). The prefix indicates how many bits define the network portion.
Why subtract 2 from total hosts?
The first address is the network address and the last is the broadcast address - neither can be assigned to a host.
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