NetSim Pro is a browser-based network learning app. It helps you explore common networking tasks in one place. You can build simple network layouts, check IP details, look up ports and protocols, test packet flow, and follow a guide for network design.
It works in a web browser, so there is no install step for most users. On Windows, you can download the release package from GitHub, open it, and run the app in your browser or from a local file, based on how the release is packaged.
- Build network layouts with the topology designer
- Check common protocols and ports
- Simulate how packets move across a network
- Analyze IP addresses and network ranges
- Follow clear steps for network design
- Learn basic TCP/IP and OSI model concepts
- Use a subnet calculator for quick checks
- Study common services like DHCP, DNS, HTTP, and HTTPS
NetSim Pro is built with HTML, CSS, and JavaScript. For Windows, a modern setup is enough.
- Windows 10 or Windows 11
- A current browser such as Edge, Chrome, or Firefox
- At least 2 GB of free memory
- 200 MB of free disk space
- Internet access for the first download
If you plan to use it offline, keep the release files in one folder so the app can load its resources from the same place.
Visit this page to download the latest Windows release:
After the page opens:
- Find the newest release at the top of the list
- Open the release notes
- Download the Windows file or ZIP package
- Save it to your Desktop or Downloads folder
Use the link above and save the release file to your computer.
- If you downloaded a
.zipfile, right-click it and choose Extract All - Pick a folder you can find later, such as
Documents\NetSimPro - If you downloaded an
.htmlfile or folder package, keep the files together in one place
- Open the extracted folder
- Look for the main file, often named
index.html - Double-click it
- Your browser should open the app
- Choose Microsoft Edge or your preferred browser
- Select Always use this app if you want the same choice next time
If you move one file out of the folder, the app may not load correctly. Keep the full release folder intact.
Use this area to build a simple network map. Add devices, place them on the canvas, and plan how they connect.
Look up common network services and their ports. This is useful when you want to check what a service does and which port it uses.
Watch how a packet moves through a network path. This helps you understand how devices talk to each other.
Enter an IP address and review its details. Use it to check the address type, range, and related network info.
Follow a step-by-step guide for basic network planning. It helps you think through layout, addressing, and service use.
NetSim Pro includes study areas for many standard networking topics:
- CCNA basics
- Network+
- TCP/IP
- OSI model
- DHCP
- DNS
- HTTP and HTTPS
- Network engineering
- Subnetting
- Network design
- Packet flow
- Protocol lookup
- IP analysis
Start with the network design guide. Then open the topology designer and build a small home or office setup.
Use the protocol reference while you study DHCP, DNS, and web traffic. Then test your ideas in the packet simulator.
Create a few common networks:
- A router with two PCs
- A small office with a switch and printer
- A client and server setup
- A basic subnetting exercise
Use the IP analyzer when you want to review:
- Network address
- Broadcast address
- Subnet mask
- Address range
If you open the release package, you may see files like these:
index.htmlfor the main appassetsorjsfolders for app logiccssfiles for layout and style- images or icons for the interface
Keep the folder structure as it came in the download.
For the best result on Windows:
- Use the latest version of Edge or Chrome
- Turn off strict download blocking if the file does not open
- Allow local file access if the browser asks for it
- Refresh the page if parts of the app do not load after the first open
If one browser does not work well, try another one.
- Check that the download finished
- Extract the ZIP file first
- Make sure you opened the correct main file
- Keep all files in the same folder
- Use a modern browser
- Reload the page
- Clear the browser cache
- Close other tabs
- Open the app again from the same folder
- Return to the release page
- Try the newest release again
- Save the file to a folder with a short name
If the app lets you save layouts or notes:
- Create a folder for your labs
- Name files by date or topic
- Keep subnet exercises in separate folders
- Back up your work to OneDrive, Google Drive, or an external drive
- Students learning networking
- Beginners who want a clear visual tool
- Teachers who want a simple lab aid
- Home users who want to understand how networks work
- Anyone studying for CCNA or Network+
- Download the latest release
- Open the main app file in your browser
- Try the topology designer first
- Check a few common ports
- Use the IP analyzer on a sample address
- Walk through the network design guide
- Test a simple packet path
- Build a small LAN with three devices
- Look up the ports for DNS and HTTP
- Check an IP address and its subnet
- Compare client and server traffic
- Design a basic office network
- Review how DHCP gives out addresses
- Study how HTTPS differs from HTTP