Dan’s Port Scanner

Dan’s Port Scanner: Open-Source Network Port Discovery Tool Network security starts with visibility. You cannot protect assets you do not know exist. Dan’s Port Scanner addresses this need directly. It offers a lightweight, open-source solution for network port discovery. This tool helps administrators map their attack surface quickly and efficiently. What is Dan’s Port Scanner?

Dan’s Port Scanner is an open-source utility designed to identify active hosts and open ports on a network. Built with simplicity and speed in mind, it provides a transparent alternative to bloated proprietary software. Because the source code is publicly accessible, security teams can audit, customize, and integrate the tool into existing DevSecOps pipelines without licensing constraints. Key Features

High-Speed Scanning: Utilizes asynchronous network requests to probe thousands of ports in seconds.

Low Resource Footprint: Runs efficiently on minimal hardware, including single-board computers like Raspberry Pis.

Custom Port Ranges: Allows users to target specific standard ports or execute comprehensive 0–65535 scans.

Service Detection: Banner-grabbing capabilities help identify the software versions running on open ports.

Exportable Reports: Saves scan results in clean Markdown, JSON, or CSV formats for easy documentation and analysis. How It Works

The tool operates by sending network packets to targeted IP addresses and analyzing the responses.

Host Discovery: Sends ICMP echo requests (pings) to verify if the target machine is online.

Port Probing: Establishes TCP handshakes or sends UDP packets to specified port numbers.

Response Analysis: Integrates response codes (like TCP SYN-ACK) to determine if a port is open, closed, or filtered by a firewall.

Output Generation: Compiles the findings into a structured layout for the user. Use Cases for Network Admins 1. Vulnerability Assessment

Unused open ports are open invitations for malicious actors. Security teams use this scanner to detect unauthorized services, outdated software banners, and accidental exposures before attackers do. 2. Firewall Verification

After configuring network policies, administrators must verify that firewalls are actively blocking restricted traffic. Running an external scan confirms whether your firewall rules are working as intended. 3. Inventory Management

In dynamic environments, rogue devices can easily connect to the network. Regular automated scans help maintain an accurate, real-time inventory of all active IP addresses and their exposed services. Getting Started

Because Dan’s Port Scanner is open-source, deployment takes only a few steps. You can clone the repository directly from GitHub, install the minimal dependencies, and run your first scan via the command-line interface.

# Example command to scan a local subnet dans-scanner –target 192.168.1.0/24 –ports 21,22,80,443 –output json Use code with caution.

Note: Always ensure you have explicit authorization before scanning any network that you do not own or manage.

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