🔍 Multi-Threaded Port Scanner

A fast and colorful multi-threaded port scanner written in C#, built to quickly identify open TCP ports on any IPv4 or IPv6 address.

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✨ Features

• ✅ Multi-threaded scanning (async + SemaphoreSlim)
• ✅ Clean and colorful console interface
• ✅ Customizable port range input
• ✅ Detection of:
  • Open ports
  • Filtered (timed out) ports
  • Closed ports
• ✅ Console title, custom ASCII banner, and status logs
• ✅ Works on both IPv4 and IPv6 targets

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🖥️ Example Output

Enter target IP: 192.168.1.1 Enter start port (default 1): 20 Enter end port (default 80):

Scanning 192.168.1.1 from port 20 to 80...

[✔] Port 22 is OPEN [✔] Port 80 is OPEN [✘] Port 23 is CLOSED [⚠] Port 25 is FILTERED (Connection Timeout)

Scan Complete!

Open Ports: Port 22 is OPEN Port 80 is OPEN

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⚙️ How to Use

🧾 Prerequisites

• .NET SDK 6.0 or later

🛠️ Build & Run

git clone https://github.com/sn1wfy/PortScanner.git
cd PortScanner
dotnet run

#This tool is intended for educational and authorized penetration testing purposes only. Scanning systems without explicit permission is illegal and unethical.