Active IT Prep Subnet Calculator
A free subnet calculator that teaches the method
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Active IT Prep Subnet Calculator - A free subnet calculator that teaches the method

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Free subnet calculator for Network+ students. Enter an IP and CIDR to get the network ID, host range, and broadcast, then follow the Magic Number steps to check your math. Includes 20 graded practice problems. No signup, no ads.

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Hi Product Hunt, I'm the maker. I passed Network+ and subnetting took me the most reps, and every calculator I found only gave the answer. So I built one that shows the decimal Magic Number steps under each result, so you can check your own work and learn the method. There are 20 graded practice problems too. It runs on Cloudflare Workers, with no signup and no ads. I'd love to hear what you'd add. A VLSM splitter? Supernetting? Wrong answers or odd masks that break it are especially welcome.