Enter an IPv4 address in CIDR notation to get network, broadcast, mask, and host counts.
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Quick answers to common questions
CIDR (Classless Inter-Domain Routing) writes an IP address followed by a slash and prefix length, e.g. 192.168.1.0/24.
A /24 subnet uses 24 bits for the network portion, giving a subnet mask of 255.255.255.0 and 256 total addresses.
For subnets /30 and smaller, all addresses may be usable. For /29 and larger, network and broadcast addresses are reserved.
This tool calculates IPv4 subnets only.
Works with any valid IPv4 address including 10.x, 172.16–31.x, and 192.168.x private ranges.
No. All calculations run in your browser.
Yes. Use the Copy button to copy all subnet details.
Yes.
Your data is processed entirely in your browser. Nothing is sent to any server.