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subnetting

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A structured and beginner-friendly guide to the fundamentals of computer networking covering everything from IP addressing, subnetting, routing, and protocols to network security and troubleshooting.

  • Updated Mar 24, 2026
  • JavaScript

NetPractice is a networking project from 42 that introduces the fundamentals of IP addressing and network configuration. Through interactive exercises, it focuses on understanding subnet masks, network and broadcast addresses, routing, and communication rules between machines without writing any code.

  • Updated Jan 31, 2026
  • JavaScript

CidrPlan is a lightweight, browser-based IPv4 subnet planning tool that lets you interactively design and manage network address spaces. Split larger blocks into smaller subnets, merge them back together, name your networks, and export your plans in multiple formats—all without leaving your browser.

  • Updated Jan 29, 2026
  • JavaScript

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