FastPortScanner

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A high-performance TCP port scanner written in Java using non-blocking I/O (java.nio).

Designed to scan thousands of ports quickly while collecting basic service banners and fingerprints.

The scanner uses a pipeline architecture with asynchronous sockets and selectors, allowing a large number of concurrent connections while keeping resource usage relatively low.

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Features

• ⚡ Fast asynchronous scanning using Java NIO
• 🔗 Up to 2000 concurrent connections
• 📡 Banner grabbing for service identification
• 🧠 Basic service fingerprinting
• 🎯 Top-25 ports quick scan mode
• 📊 Live progress bar
• 🎨 Colored terminal output
• 📋 Automatic service detection

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How It Works

Instead of scanning ports sequentially, the scanner uses a non-blocking pipeline model:

1. Ports are queued for scanning.

2. Multiple connections are opened asynchronously.

3. When a connection succeeds, the scanner:

   • optionally sends a service probe
   • waits for a banner response

4. The response is analyzed to identify the service.

This allows thousands of ports to be scanned simultaneously.

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Supported Service Detection

The scanner detects common services using:

Known Port Mapping

Examples:

Port	Service
21	FTP
22	SSH
25	SMTP
80	HTTP
443	HTTPS
3306	MySQL
5432	PostgreSQL
6379	Redis
27017	MongoDB

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Banner Fingerprinting

The scanner also checks banners for common identifiers like:

• OpenSSH
• Apache
• nginx
• HTTP/1.1
• MySQL
• PostgreSQL
• Redis

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Installation

Compile the program with:

javac FastPortScanner.java

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Usage

Basic scan:

java FastPortScanner <host>

Example:

java FastPortScanner scanme.nmap.org

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Fast Scan (Top 25 Ports)

java FastPortScanner <host> --top

Example:

java FastPortScanner 192.168.1.1 --top

This scans only the 25 most common ports, which is significantly faster.

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Example Output

OPEN PORTS FOUND:

┌────────┬──────────────────┬────────────────────────────────────────────┐
│ Port   │ Service          │ Banner                                     │
├────────┼──────────────────┼────────────────────────────────────────────┤
│ 22     │ ssh              │ SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.5    │
│ 80     │ http             │ HTTP/1.1 200 OK                            │
│ 443    │ https            │ HTTP/1.1 400 Bad Request                   │
└────────┴──────────────────┴────────────────────────────────────────────┘

Summary:
► Found 3 open ports
► Scan finished in 2.1s

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Technical Details

Key technologies used:

• Java NIO

  • SocketChannel
  • Selector
  • SelectionKey

• Non-blocking network I/O

• Concurrent connection management

• Banner probing

• Simple fingerprint matching

Max concurrent connections:

2000

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Limitations

This tool is intended for learning and experimentation.

It does not implement advanced techniques such as:

• SYN scanning
• UDP scanning
• OS detection
• advanced service fingerprinting
• evasion techniques

For professional scanning use tools like Nmap.

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Disclaimer

This tool is intended for educational and authorized security testing only.

Do not scan systems without permission.

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Made with <3 by URDev