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IP Subnet Calculator is a free online tool that computes comprehensive subnet details for any IPv4 address and CIDR prefix length. Enter an IP address and select a CIDR prefix to instantly see the network address, broadcast address, subnet mask, wildcard mask, first and last usable host addresses, total and usable host counts, IP class, and whether the network is private or public. This tool is essential for network engineers, system administrators, and IT students working with IP addressing and subnetting. All calculations run in your browser.