Java Multi-Threaded Port Scanner & Banner Grabber

A concurrent network reconnaissance utility written in pure Java. This tool is designed to identify open ports on a target host and perform "banner grabbing" to retrieve service details, a foundational step in vulnerability assessment and ethical hacking.

Key Features

• Multi-Threaded Execution: Utilizes Java's ExecutorService to manage a pool of concurrent threads, optimizing scan speed across multiple ports.
• Network Sockets: Uses native java.net.Socket connectivity with custom timeouts to cleanly handle open, closed, or filtered ports.
• Banner Grabbing: Attempts to read information streams from open sockets to identify software versions running on active ports.

Project Structure

java-security-port-scanner/ ├── src/ │ └── PortScanner.java # Main application logic and thread pool coordination └── README.md

Requirements & Setup

• Language: Java 8 or higher
• Environment: Any IDE (IntelliJ, Eclipse, VS Code) or terminal execution setup.

How to Run

1. Open src/PortScanner.java in your workspace.
2. Adjust the TARGET_HOST variable if you wish to scan a specific local service.
3. Compile and execute the main method.

Disclaimer: This project is intended strictly for educational and defensive security purposes.