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Every network asks one question first: who are you?
That question is ARP — the bow before the match, the handshake before any packet flows. ARPninja starts where the network starts and trains you all the way up: plain-English lessons, hands-on drills, and packet-level sparring. Free. In your browser. No accounts.
dojo/doors
Enter at your level. Leave stronger.
No gatekeeping, no fluff. Pick the door that matches where you are today — every path cross-trains with the others.
Learn
for the curious
What actually happens when you load a website? Why is the WiFi slow? Zero jargon, real answers — the internet explained like a good neighbor would.
- plain-english explainers
- visual packet walk-throughs
- no prerequisites, ever
Train
for the climbing
Structured paths from cables to routing. Drills that build muscle memory — the skills behind CCNA and Network+, and the ones the exams skip.
- subnetting trainer
- spaced-repetition flashcards
- guided learning paths
Spar
for the dangerous
No lessons here. Broken networks, suspicious captures, and questions with sharp edges. Prove it — or find the gap in your guard.
- packet-capture puzzles
- "why is this broken?" scenarios
- timed drills & leaderboard
dojo/path
Belts are earned, not given.
Progress is tracked in your browser as you complete lessons, drills, and spars. Each belt unlocks harder opponents.
shodan · begin
White — see the network
Frames, addresses, and the bow itself: ARP. You'll never look at "the WiFi" the same way again.
renshū · practice
Blue — speak the network
Subnets, VLANs, routing, DNS. Drilled until it's reflex, not recall.
shiai · contest
Black — defend the network
Read captures cold. Find the fault. Explain it under pressure. Then teach the next student.
dojo/allies
When training ends, the real internet begins.
// for practitioners
TravTeks
Deep dives, live internet observatories, and 32 free browser tools — BGP looking glass, DNSSEC checkers, speed tests with bufferbloat grading. Where black belts go to watch the real network breathe.
travteks.com →
// for businesses
WolfWarden
Rather have it handled than learn it? WolfWarden builds, hosts, secures, and watches business websites — one accountable engineer, plans from $99/month.
wolfwarden.com →