Best Free Network Discovery Tools of 2025

JDisc Discovery is a powerful IT asset management and network discovery tool, designed to provide organizations with clear, real-time insights into their entire IT environment. By automatically scanning the network, it identifies and catalogs devices, from physical servers and workstations to virtual machines and network appliances, giving users a detailed inventory of their assets. The tool captures essential data such as hardware specifications, installed software, system configurations, and interdependencies among devices. A key advantage of JDisc Discovery is its agentless architecture. Rather than requiring installation on each device, it uses multiple protocols (like SNMP, SSH, WMI) to gather information, ensuring quick deployment and compatibility across various operating systems, including Windows, Linux, and Unix. This makes it ideal for diverse and dynamic IT ecosystems, enabling efficient and non-intrusive data collection.

FirstWave’s NMIS is a network management system that provides fault, performance, configuration management, performance graphs, and threshold alerts. Business rules allow for highly specific notification policies that can be used with multiple notification methods. FirstWave also enables partners, including some of the world’s largest telcos and managed service providers (MSPs), to protect their customers from cyber-attacks, while rapidly growing cybersecurity services revenues at scale. FirstWave provides a comprehensive end-to-end solution for network discovery, management, and cybersecurity for its partners globally.

Paessler PRTG is an all-inclusive monitoring solution with an intuitive, user-friendly interface powered by a cutting-edge monitoring engine. It optimizes connections and workloads, reduces operational costs, and prevents outages. It also saves time and controls service level agreements (SLAs). This solution includes specialized monitoring features such as flexible alerting, cluster failover, distributed monitoring, maps, dashboards, and in-depth reporting.

ManageEngine OpManager is a robust network discovery solution that automatically detects and maps all devices within a network. It offers complete visibility into the network infrastructure, including routers, switches, servers, and other components, allowing IT teams to grasp their network topology. With features such as automatic device classification, real-time updates, and comprehensive reporting, OpManager streamlines the management of complex networks. This powerful tool assists organizations in maintaining accurate inventories, optimizing resource allocation, and improving overall network performance by delivering valuable insights into device relationships and connectivity.

Most network scanning software packages require credentialed access to remote devices in order to detect operating system. Slitheris Network Discovery uses TCP/IP stack fingerprinting, other technologies, and can identify many operating systems without authentication or credentials, including Windows (and its Edition), Linux and iOS. Slitheris can also scan for details about the operating system, such as Windows Uptime and Cold Boot Time, Time of Day, and Domain/Workgroup names. It distinguishes between Domain types and Workgroup types without requiring authentication or credentialed accessibility. This saves time and frustration when trying to find usernames and passwords, or visiting servers and PCs in person. This unique feature will be especially appreciated by IT Providers and Managed Service Providers.

Nmap is an open-source software project that aims to dispel the stereotype of poorly documented open-source software. It provides a comprehensive set documentation for installing and using Nmap. This page links to Insecure.Org documentation as well as generous contributions by other parties. Nmap Network Scanning, the official guide to Nmap Security Scanner is a free and open source utility that millions of people use for network discovery, administration and security auditing. This book is suitable for all levels of security and networking professionals, from beginners to advanced hackers to explaining basic port scanning techniques. The 42-page reference guide explains each Nmap option and feature, while the rest of this book shows how to use those features to solve real-world problems. Diagrams and examples show real communication over the wire.

VIZOR is an ITIL Certified IT Asset Management Solution. VIZOR manages all aspects of IT asset management. This includes network discovery, inventory data, purchase, warranty, and maintenance details. The allocation of assets to employees and locations can be simplified so that you always know who has what. VIZOR can audit your network and integrate with tools like LANSweeper, Microsoft SCCM, Chromebook Admin, and LANSweeper. VIZOR can be configured to only include the features you need. Get started now.

OpUtils is an IP address and switch port management tool that engineers can use to efficiently monitor, diagnose and troubleshoot IT resources. OpUtils is a complement to existing management tools, providing real-time monitoring and troubleshooting capabilities. It makes it easy for network engineers to manage their switches and IP addresses. This switch port management tool includes over 20 tools that can be used to monitor network performance, such as monitoring bandwidth usage, monitoring the availability of critical devices, and backing up Cisco configuration files. Advanced IP scanning of IPv4 or IPv6 subnets within your network is possible to identify available and used IP addresses. You can scan all switches in your network, map ports, run port scans, and view details such user, physical location, and more. Block access to rogue devices and identify rogue device intrusions.

Codima Toolbox provides an all-in-one solution that allows an organization to discover and manage all network assets, automatically create documentation in both Web or Visio Network Maps and monitor network devices, all without the need for agents. Toolbox allows users to make informed decisions using reliable data. After a Network Discovery, all other features within Toolbox are fully set up and ready for use. Make device network management and documentation simple.

Monitors all mission-critical infrastructure components, including services, applications, operating systems, network protocols and metrics, as well as network infrastructure. There are hundreds of third-party add-ons that allow for the monitoring of virtually all of your in-house services and applications. This dashboard provides a central view of all IT operations and business processes. The dashboards are a powerful way to quickly access third-party data and monitoring information at a glance. Views allow users to quickly access the most relevant information. Organizations can plan for infrastructure upgrades with automated, integrated trending graphs and capacity planning graphs before they are caught by surprise by outdated systems. IT staff, business stakeholders and end-users receive alerts via email or text message. They provide outage details so that they can resolve issues immediately.

Easy-IP is a web-based, fast IP Address Management (IPAM), solution that helps you manage your entire IP network infrastructure better. Easy-IP uses a powerful SNMP Network Discovery engine to allow you to keep an accurate and up-to-date inventory of all your network devices. Dynamically assign and track IP addresses. Eliminate duplicate IP address errors. You can reduce your IP administration costs by as much as 50% Multiple tenancies can be managed and overlapped IP address spaces can be reduced by up to 50%. Easy-IP allows you to keep track of all your IPv4/IPv6 subnets, VLANS and IP addresses DNS hostnames. It also helps you monitor vital network devices such as routers, switches, servers, and switches. Intuitive HTML5 web interface. Automated IPv4 and IPv6 Subnet Allocation. Rapid SNMP Network Auto-Discovery. Granular Role-Based Access Rights Advanced Import/Export Functions Full-text search capabilities with powerful results Flexible Management Reports. User-Defined Custom Felds Web Services SOAP API. SNMP MIB Browser. Switch Port Mapper.

GroundWork Monitor Enterprise is an IT monitoring software that can monitor your physical, virtual, or cloud-based infrastructures. GroundWork can monitor all aspects of your IT environment. GroundWork can monitor any IT environment you have. GroundWork Monitor Enterprise is an enterprise-wide monitoring system that bridges cloud-scale and on-premise monitoring and analytics. GroundWork allows you to collect and analyze all of your operational and performance data from one platform. GroundWork combines performance and availability across your entire application stack. GroundWork provides flexible and customizable workflows as well as powerful integrations. GroundWork is your central point for IT monitoring data collection, status alerting, and status alerting. GroundWork monitors application health, automatically deploys monitoring, and identifies network issues. GroundWork agents with API-based monitoring make real-time data collection possible. We make it simple to reduce manual intervention by using automated network discovery and device registration.

Scapy is an interactive packet manipulation program. It can forge and decode packets from a variety of protocols, send them over the wire, capture them and match requests and responses. It can handle most of the classic tasks such as scanning, tracerouting and probing, attacks, or network detection (it can replace Hping, 85% nmap, arpspoofsk, arping), tcpdumpshark, p0f and tshark). It can also handle a lot more specific tasks than most other tools, such as sending invalid frames, injecting 802.11 frames, combining technologynics (VLAN hopping+ARP caching poisoning, VOIP descoding on WEP encrypted channel), and so forth. Scapy works natively on Linux and Windows as well as OSX and most Unixes that have libpcap. The same code base runs natively on Python 2 and Python 3 Scapy development uses Git version control system. The GitHub repository hosts the Scapy reference repository.

Advanced IP Scanner has been proven reliable over the years to be a useful tool for managing LANs and performing a wide variety of networking tasks. Famatech and beta-testers from all over the world rigorously test each new version. To ensure the best possible solution for customers, Famatech takes into consideration all suggestions for product improvement. Radmin, Famatech’s popular remote tech support product, is integrated with Advanced IP Scanner. This allows Advanced IP Scanner to expand its capabilities and simplifies the job of the system administrator. Famatech software can be used by many technology leaders, including IBM, Sony and Nokia, HP and Siemens, as well as major telecommunications operators and government organizations and financial institutions.

Network Scanner is an IP scanner. It can scan large corporate networks with hundreds of thousands of computers as well as small home networks with many computers. The program can scan a variety of IP addresses, computers, and ranges of addresses. However, the number and subnets that it can scan is unlimited. Network Scanner will display all shared resources, including hidden NetBIOS (Samba), shared resources as well as FTP and web resources. Network Scanner is available to both network administrators as well as regular users. It can be used to audit network computers and search for available resources. Network Scanner can not only locate network computers and shared resources but also check access rights. Users can mount the network drive, or open them in Explorer. The program allows you to easily export the network scan results to an XML or HTML file, or save them in the program.

Cisco Network Assistant simplifies wired network management for up to 80 devices using its intuitive GUI and task-based menu. Cisco Network Assistant is available for free and can be used to apply common services across Cisco switches and routers, wireless controllers and access points. You can access Cisco Active Advisor directly by linking to it. This will allow you to view important information about the products in your network, including Warranty and Contract Information, Advisories, End of Life notifications, and Advisories. Cisco Active Advisor will automatically populate with devices managed by Cisco Network Assistant. Cisco Network Assistant gives network administrators a central view of their network. They can also use its features across Cisco products, whether they are small or large businesses or branch offices. Network discovery and easy display in a topology diagram. Configuration management for Cisco products that are suitable for small and medium-sized businesses.

This is IT management and monitoring done right. You can quickly see the whole picture and respond to any issues. All of the above, plus remote control and patch management, are all included in one elegant and simple-to-use tool. Have you got a minute? It takes just minutes to install a lightweight, powerful agent on all your devices. You will receive detailed information about your IT environment within minutes. We make IT administration simple. Automated discovery of devices and services in your IT environment. Remotely install applications and run scripts. All you need in one tool. It is unacceptable to experience downtime. Panorama9 can help you avoid problems by anticipating them so that you can be proactive rather than reactive. Panorama9 instantly notifies you if something goes wrong so you can take corrective action before your users notice. Your security is only as strong and secure as the weakest link. We'll show you.