A modern, interactive IPv4 subnet calculator built for learners and pentesters. This web app calculates network addresses, broadcast addresses, usable host range, block size, and more, while explaining each step so you understand why the calculations work.
networking ipv4 ip-address cybersecurity penetration-testing cidr network-protocols network-architecture network-scanning block-size reconnaissance subnetting computer-networks learning-tool interactive-tool networking-education ip-calculation network-math binary-math host-calculation
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Updated
Jan 24, 2026 - HTML