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Practice coding interviews out loud with real-time voice coaching. Your code actually runs.
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IPv4 Iterators and CIDR
Build practical IPv4 primitives: forward/reverse iterators, CIDR range expansion, and (finally) covering N sequential IPs with minimum CIDR blocks. This tests bitwise thinking, boundary discipline, and writing clear stateful code.
Meet Allison & Tim
Your AI coaches
Practice coding interviews out loud with real-time voice coaching. Your code actually runs.
Desktop required to run this problem
StrongYes runs real code + tests in a desktop editor. Mobile is view-only for now, so you can’t start this here. Sorry about that — email yourself a link and pick it up on your computer.
Start Part 1 to unlock your next challenge
Desktop required
Sorry — mobile can’t run the editor + tests yet. Email yourself a link to continue on desktop.