scanner.zip # **Free Subnet Scanner for Windows: Discover Vulnerabilities and Customize Your Tool** ## **Introduction** Network security is a critical aspect of IT infrastructure management. Identifying vulnerabilities within a subnet is essential for preventing cyberattacks and ensuring system integrity. A **subnet scanner** is a powerful tool that helps administrators detect open ports, active hosts, and potential security flaws. For Windows users, finding a **free and customizable subnet scanner** can be challenging. However, several open-source and free tools allow users to scan networks, detect vulnerabilities, and even modify the source code for further development. ## **Why Use a Subnet Scanner?** A subnet scanner provides the following benefits: – **Network Discovery**: Identifies all active devices within a subnet. – **Vulnerability Detection**: Scans for weak configurations, open ports, and outdated services. – **Security Auditing**: Helps in compliance checks and penetration testing. – **Customization**: Open-source tools allow developers to enhance functionality. ## **Top Free Subnet Scanners for Windows** ### **1. Nmap (Network Mapper)** **Nmap** is one of the most popular network scanning tools available. It supports Windows and offers extensive features, including: – Host discovery – Port scanning – OS and service detection – Vulnerability assessment via NSE (Nmap Scripting Engine) **Download & Development**: – **Free Download**: //nmap.org](https://nmap.org) – **Open-Source**: Can be modified and extended using Lua scripts. ### **2. Advanced IP Scanner** A lightweight yet powerful tool for scanning local networks. Features include: – Fast detection of connected devices – Remote access via RDP and SSH – Exportable scan reports **Download**: //www.advanced-ip-scanner.com](https://www.advanced-ip-scanner.com) ### **3. Angry IP Scanner** An open-source scanner that provides: – Cross-platform support (Windows, Linux, macOS) – Plug-in system for extended functionality – Export results in multiple formats (CSV, TXT, XML) **Download & Development**: – **Free Download**: //angryip.org](https://angryip.org) – **Open-Source**: Available on GitHub for customization. ### **4. SoftPerfect Network Scanner** A versatile tool with a user-friendly interface, offering: – Wake-on-LAN and remote shutdown – Detection of shared folders and weak passwords – Custom scripting support **Free Version**: //www.softperfect.com/products/networkscanner](https://www.softperfect.com/products/networkscanner) ## **How to Develop Your Own Subnet Scanner** If you want to **build a custom subnet scanner**, consider using Python with libraries like: – **Scapy** (Packet manipulation) – **Socket** (Network communication) – **Nmap Python (python-nmap)** (Integration with Nmap) ### **Example Python Script for Subnet Scanning** ”`python import nmap scanner = nmap.PortScanner() target_subnet = ”192.168.1.0/24″ scanner.scan(hosts=target_subnet, arguments=’-sn’) for host in scanner.all_hosts(): print(f”Host: host is up”) ”` This script performs a simple ping scan (`-sn`) to detect live hosts in a subnet. ## **Conclusion** A **free and customizable subnet scanner** is an invaluable tool for network administrators and security professionals. Tools like **Nmap, Angry IP Scanner, and Advanced IP Scanner** provide robust scanning capabilities, while open-source options allow for further development. By leveraging these tools—or even building your own—you can enhance network security, detect vulnerabilities, and maintain a secure IT environment. **Download, scan, and customize—strengthen your network defenses today!**