IPv4 Subnet Calculator

Calculate network, broadcast, usable range, and host count for an IPv4 CIDR prefix.

✳ Input stays in this browser. No account needed.

IPv4 address and CIDR

About this utility

Calculate network, broadcast, usable range, and host count for an IPv4 CIDR prefix. Double-check results before applying them to production infrastructure, and follow organizational security policies when using third-party websites.

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