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Free tool
IP Subnet Calculator
Enter an IPv4 address with a CIDR prefix (e.g. 192.168.1.0/24) to get the network address, broadcast address, usable host range and more. Runs entirely in your browser — nothing is sent anywhere.
Accepts standard IPv4 dotted-decimal notation with a /0–/32 CIDR prefix. Input is validated before any calculation runs.
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