Packet.School
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Sandbox

Sandbox

Ten interactive tools. Experiment with networking concepts directly in your browser.

Packet Journey
packet-journey
DNS Lookup
dns-lookup
DHCP Simulator
dhcp-simulator
Subnet Calculator
subnet-calc
Terminal
terminal
Network Builder
network-builder
Ping & Traceroute
ping-trace
Network Challenge
network-challenge
Network Glossary
glossary
Cheat Sheet
cheat-sheet
Packet.School

An open, interactive curriculum for computer networking.

v3.0 · MIT22 lessons live

Learn

  • Lessons
  • Sandbox
  • Levels
  • Pricing
  • About

Simulations

  • Packet Journey
  • DNS Lookup
  • DHCP Simulator
  • Subnet Calc
  • Network Builder
  • Terminal

Project

  • About
  • Changelog
  • GitHub
  • Contributing
  • Style guide

Newsletter

One short email when a new level ships. No tracking pixels.

© 2026 Packet.School — MIT licensed☕ Support with a coffeebuilt in the open · last updated 2026.05.14