Networking Games
Subnetting is not hard — it is slow until you have drilled it. These are timed, 60-second drills built for exactly that: the recall speed CCNA demands under exam pressure. Everything runs in your browser, nothing is sent to any server, and there is no signup.
Subnetting Sprint
Given an IP and prefix, call the network address, broadcast, usable hosts or mask. The core CCNA skill, against the clock.
Play →60 secondsSubnet Mask Match
Convert any /prefix to its dotted-decimal mask and back. Pure recall — the table you should know cold.
Play →60 secondsPort Number Rush
SSH, DNS, TFTP, BGP, RADIUS — match each service to its well-known port before the timer runs out.
Play →Why timed drills work
In the exam you do not get to derive a subnet mask from first principles — there is not enough time. You need it instantly, the way you know a multiplication table. Short, repeated, timed practice is what moves knowledge from "I can work it out" to "I already know it". Play a round between study sessions rather than grinding for an hour.
Your best score is saved in your own browser only. Prefer longer, exam-style questions with explanations? Use the free practice tests, or the subnet calculator to check your working.
Speed is practice. Skill is the rack.
These drills build the recall speed the CCNA exam demands. The job demands more — configuring real routers and switches until it is second nature. That is what we teach in Ahmedabad, on real Cisco hardware.