Learn Networking
by Actually Seeing It
Ever wonder what happens when you type a URL and hit enter? Or how your WiFi reaches your phone through walls? These interactive tools let you visualize, simulate, and experiment with the same concepts that power the internet.
How the Internet Works
Watch packets hop across routers, see DNS turn domain names into IP addresses, and trace the path your data actually takes.
Cybersecurity Basics
See how HTTPS encrypts your connection, build firewall rules to block traffic, and understand how DDoS attacks overwhelm servers.
What APIs Are (and How to Use Them)
Call real API endpoints, see JSON responses, and get working code you can copy into your own projects in 4 languages.
The Math Behind It
Convert between binary, hex, and decimal. Calculate subnets, bandwidth, and see how computers think in ones and zeros.
Network Visualizers
These tools let you see what's normally invisible. When you visit a website, dozens of steps happen in milliseconds — packets get routed, DNS lookups resolve, TLS handshakes encrypt your connection. Pick any tool below and watch it happen in real time.
Security Tools
Cybersecurity starts with understanding the basics. Test how strong your passwords really are, and learn the difference between encoding and encryption — a distinction that trips up even experienced developers.
Web & API Tools
Every time your browser loads a page, it's speaking HTTP. These tools let you see exactly what's being sent and received, and work with the data formats that power modern web applications.
Utility Tools
Networking runs on numbers. These calculators help you convert between the number systems computers use and figure out real-world questions like "how long will this download take?"
API Explorer
APIs are how apps talk to each other. This tool gives you 12 free endpoints to practice with — no sign-ups, no API keys. Hit a button, get JSON back, and copy working code straight into your projects.