NetLab

What it does

Free web-based network simulator like Cisco Packet Tracer. Design network topologies, configure routers & switches, simulate DHCP, practice CLI commands. No download required!

• IM
  I'm writing a free book called Computer Networks from Scratch2022 · networksfromscratch.com · ▲792
• AT
  A toy version of Wireshark (student project)2025 · github.com · ▲265

  Hi everyone, I recently published a small open-source project. It’s a minimal network packet analyzer written in Go — designed more like a learning toy than a replacement for Wireshark. It currently supports parsing basic protocols like TLS, DNS, and HTTP, and includes a tiny fuzzing engine to test payload responses. You can inspect raw packet content directly from the terminal. The output is colored for readability, and the code structure is kept simple and clear. The entire program is very small — just about 400 lines of Go code. I know it’s not anywhere near Wireshark’s level, and I still…

• IB
  I built a macOS tool for network engineers – it's called NetViewsFeb 2026 · netviews.app · ▲243

  Hi HN — I’m the developer of NetViews, a macOS utility I built because I wanted better visibility into what was actually happening on my wired and wireless networks. I live in the CLI, but for discovery and ongoing monitoring, I kept bouncing between tools, terminals, and mental context switches. I wanted something faster and more visual, without losing technical depth — so I built a GUI that brings my favorite diagnostics together in one place. About three months ago, I shared an early version here and got a ton of great feedback. I listened: a new name (it was PingStalker), a longer trial,…

• NC
  NetSour, CLI Based Wireshark2024 · github.com · ▲59

  This code is still in early beta, but i sincerley hope it will become as ubiquitous as VIM on Linux.

• AU
  An ultra-light-weight tool to quickly test your ping2022 · ping.projects.chrisjeakle.com · ▲96

  Howdy HN! I find myself testing my ping from time to time, especially when my internet seems wonky while WFH. It feels like there should be an easier way test my ping than puling up a terminal or a complex web app - especially when I'm on my phone or any other device that doesn't have a terminal. I figured I should be the change I wish to see in the world and created this super light ping test. I also created a latency monitoring solution (https://github.com/cjjeakle/network-monitor), feel free to clone and try it out! I know there are a lot more mature monitoring…

• PA
  PingStalker – A macOS tool for network engineersNov 2025 · pingstalker.com · ▲77

  Hi HN - I’m the developer of PingStalker, a macOS utility I built to see what’s really happening on the LAN/WLAN. I live in the CLI, but when it came to discovery and monitoring, I found it limiting. So I built a GUI that brings my favorite tools together in one place. PingStalker started because I wanted to know if something on the network was scanning my machine. I also wanted quick access to core details—external IP, Wi-Fi data, and local topology. Then I wanted more: fast, reliable scans using ARP tables and ICMP. As a Wi-Fi engineer, I couldn’t stop there. I kept adding ways to…

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