RJL Software - Software - Utility

Port Listener – Lightweight TCP/UDP Port Monitoring Tool

Need a quick and easy way to test open ports? Port Listener is a free, lightweight utility designed to listen on specified TCP or UDP ports, helping you troubleshoot network connections, detect port activity, and analyze incoming data. Whether you're a developer, system administrator, or security professional, Port Listener is a must-have tool for port monitoring and debugging.

Key Features:

Real-Time Port Listening – Instantly listen on any specified TCP or UDP port.
Port Usage Testing – Quickly identify if a port is in use, helping diagnose connectivity issues.
Multiple Instances Supported – Run multiple listeners simultaneously to monitor different ports at the same time.
Live Data Monitoring – View incoming data in real time to analyze transmissions and debug network communications.
Minimal System Impact – Runs in the system tray, keeping your workspace uncluttered.

Perfect For:

Developers & IT Professionals – Test network communication between applications.
Network Administrators – Troubleshoot connectivity issues and confirm port availability.
Cybersecurity Analysts – Analyze incoming data for security testing and packet inspection.
General Users – Easily check if a port is blocked or accessible.

How It Works:

Launch Port Listener and specify a TCP or UDP port to listen on.
Minimize the application to the system tray for background monitoring.
View real-time data transmissions to analyze network traffic.
Run multiple instances to test multiple ports simultaneously.

Why Choose Port Listener?

Originally developed to test error conditions in our own software, we realized this tool could be incredibly useful for others as well. Now, we're offering Port Listener for free to help developers, IT teams, and security professionals simplify network troubleshooting.