Best Free Network Discovery Tools

ManageEngine OpManager is an effective network discovery solution that automatically identifies and maps all devices within a network. It provides comprehensive visibility into the network infrastructure, including routers, switches, servers, and other components, enabling IT teams to understand their network topology. With features like automatic device classification, real-time updates, and detailed reporting, OpManager simplifies the management of complex networks. This powerful tool helps organizations maintain accurate inventories, optimize resource allocation, and enhance overall network performance by providing valuable insights into device relationships and connectivity.

Unimus is an on-prem Network Automation and Configuration Management (NCM) solution built for rapid deployment and simplicity. Its powerful Network Discovery scans your network to detect all devices, collecting hostnames, serial numbers, vendor, OS info, and open SSH/Telnet ports. Discovered devices are instantly available for backups, audits, config pushes, and CLI access. Scans can be scheduled, and the engine supports IP exclusions for focused discovery. This gives IT teams full network visibility with minimal effort. With support for 400+ device types from 150+ vendors, Unimus is a vendor-neutral solution offering automation, change management, and config auditing. It reduces manual errors, strengthens security, and speeds up operations — no coding needed.

OpUtils is IP address and switch port management software that is geared towards helping engineers efficiently monitor, diagnose, and troubleshoot IT resources. OpUtils complements existing management tools by providing trouble shooting and real-time monitoring capabilities. It helps network engineers manage their switches and IP address space with ease. With a comprehensive set of over 20 tools, this switch port management tool helps with network monitoring tasks like detecting a rogue device intrusion, keeping an eye on bandwidth usage, monitoring availability of critical devices, backing up Cisco configuration files, and more. Enable advanced IP scanning of IPv4 and IPv6 subnets in your network to identify the available and used IP addresses. Scan all the switches in your network, map switch ports, run port scans and view details such as physical location, user, and more. Identify rogue device intrusions and block access to these devices.

FirstWave’s NMIS is a complete network management system that provides fault, performance, and configuration management, performance graphs, and threshold alerts. Business rules allow for highly granular notification policies with many types of notification methods. NMIS consolidates multiple tools into one system, ready for Network Engineers to use. Scalable, flexible, open, and simple to implement and maintain, NMIS is the Network Management System that underpins the operations of over one hundred thousand organizations worldwide – making it one of the most widely used open-source Network Management Systems in the world today. FirstWave 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 software solution developed by Paessler. Equipped with an easy-to-use, intuitive interface with a cutting-edge monitoring engine, PRTG optimizes connections and workloads as well as reduces operational costs by avoiding outages while saving time and controlling service level agreements (SLAs). The solution is packed with specialized monitoring features that include flexible alerting, cluster failover solution, distributed monitoring, in-depth reporting, maps and dashboards, and more. PRTG monitors your entire IT infrastructure. All important technologies are supported: • SNMP: ready-to-use and custom options • WMI and Windows Performance Counters • SSH: for Linux/Unix and macOS systems • Traffic analysis using flow protocols or packet sniffing • HTTP requests • REST APIs returning XML or JSON • Ping, SQL, and many more

The vast majority of network scanning software packages require some type of credentialed access to remote devices to detect operating systems. However, using TCP/IP stack fingerprinting and other technologies, Slitheris Network Discovery can identify a wide array of operating systems without credentials or authentication, including Windows (and its Edition), Linux, iOS, and Android. Slitheris can even scan for other details related to the operating system such as Windows Uptime, Cold Boot Time, Time of Day and Domain/Workgroup names, and distinguishes between Domain and Workgroup types, all without needing authentication or credentialed access. This saves the time and frustration trying various usernames and passwords or having to visit PCs and servers in person. Managed Service Providers and other IT Providers will particularly appreciate this unique feature.

​Open-AudIT is a powerful network discovery and inventory software that intelligently scans an organization’s network and stores the configurations of the discovered devices. This provides immediate access to software licensing, configuration changes, non-authorized devices, capacity utilization, and hardware warranty status reports. Open-AudIT can collect significant amounts of data from large and varying networks that are cataloged and can easily be configured into meaningful reports. It enables users to easily create network discovery profiles for their organization and then run a discovery with a single click or even on an automated schedule. It audits the organization’s network daily without impacting the user experience and intelligently stores the configuration of every discovered component. Open-AudIT tracks and reports on IT asset configuration changes, software licensing, shadow IT, and hardware warranty status.

VIZOR is an ITIL Certified IT Asset Management solution. VIZOR manages the complete IT asset life-cycle combining network discovery and inventory data with purchase, warranty and maintenance details. Allocation of assets to employees and locations is simplified so you always know exactly who has what. VIZOR audits your network or integrates with tools such as Microsoft SCCM, LANSweeper and Chromebook Admin. VIZOR is completely modular so you only purchase the features you need. Try now for Free.

Codima Toolbox is an all in one solution, allowing an organization to Discover and Manage all Network Assets, Automatically create documentation in both Web and Visio Network Maps, and Monitor Network Devices, all without the use of Agents. Toolbox helps users make informed decisions using reliable device data, with minimum effort, after a Network Discovery, every other feature within Toolbox is fully set up and ready to go. Make device network management and network documentation simple.

Scapy is a powerful interactive packet manipulation program. It is able to forge or decode packets of a wide number of protocols, send them on the wire, capture them, match requests and replies, and much more. It can easily handle most classical tasks like scanning, tracerouting, probing, unit tests, attacks, or network discovery (it can replace hping, 85% of nmap, arpspoof, arp-sk, arping, tcpdump, tshark, p0f, etc.). It also performs very well at a lot of other specific tasks that most other tools can’t handle, like sending invalid frames, injecting your own 802.11 frames, combining technics (VLAN hopping+ARP cache poisoning, VOIP decoding on WEP encrypted channel), etc. Scapy runs natively on Linux, Windows, OSX, and on most Unixes with libpcap. The same code base now runs natively on both Python 2 and Python 3. Scapy development uses the Git version control system. Scapy reference repository is hosted on GitHub.

Advanced IP Scanner has proven itself through the years as a reliable and helpful tool to manage LAN and perform a wide range of networking tasks. Each new version is rigorously tested by Famatech and beta testers from around the world. The company considers all recommendations on product improvement in order to create the best possible solution for customers. Advanced IP Scanner is integrated with Radmin, Famatech’s other popular product for remote tech support. This greatly expands the capabilities of Advanced IP Scanner and simplifies the system administrator’s job. Famatech software is used by global leaders in technology, including IBM, Sony, Nokia, HP, Siemens and Samsung, as well as by major telecommunications operators, government organizations, and financial institutions.

Network Scanner is an IP scanner that is used for scanning both large corporate networks that have hundred thousands of computers along with small home networks with several computers. While the program can scan a list of IP addresses, computers and ranges of IP addresses, the number of computers and subnets is unlimited. Network Scanner will show you all the shared resources, including system and hidden NetBIOS (Samba) shared resources along with FTP and web resources. To audit network computers or use it to search for available network resources, both network administrators and regular users can use Network Scanner. Network Scanner will not only find network computers and shared resources, but also check its access rights which the user can mount as a network drive or open them in Explorer or in their browser. You can easily export the results of scanning the network to an XML, HTML or text file or store them in the program itself.

Provides monitoring of all mission-critical infrastructure components including applications, services, operating systems, network protocols, systems metrics, and network infrastructure. Hundreds of third-party addons provide for monitoring of virtually all in-house applications, services, and systems. Provides a central view of your entire IT operations network and business processes. Powerful dashboards provide at-a-glance access to powerful monitoring information and third-party data. Views provide users with quick access to the information they find most useful. Automated, integrated trending and capacity planning graphs allow organizations to plan for infrastructure upgrades before outdated systems catch them by surprise. Alerts are sent to IT staff, business stakeholders, and end-users via email or mobile text messages, providing them with outage details so they can start resolving issues immediately.

Easy-IP is a fast, web-based IP Address Management (IPAM) solution, designed to help you manage your entire IP network infrastructure more efficiently. Using a powerful SNMP Network Discovery engine, Easy-IP enables you to maintain an accurate, up-to-date inventory for all your network devices. Allocate and track IP addresses dynamically. Eliminate duplicate IP address errors. Reduce IP admin costs by up to 50%. Manage multiple tenancies and overlapping IP address spaces. With Easy-IP you can keep track of all your IPv4/IPv6 Subnets, VLANS, IP addresses DNS hostnames and vital network devices like routers, switches & servers. Intuitive HTML5 Web Interface. Automated IPv4 & IPv6 Subnet Allocation. Rapid SNMP Network Auto-Discovery. Granular Role-Based Access Rights. Advanced Import/Export Functions. Powerful full-text Search Capabilities. Flexible Management Reports. User-Defined Custom Fields. Web Services SOAP API. SNMP MIB Browser. Switch Port Mapper.

GroundWork Monitor Enterprise is a powerful IT monitoring software for physical, virtual, and cloud-based infrastructures. GroundWork can monitor your entire IT environment. If you use it, we can monitor it. GroundWork Monitor Enterprise is a unified monitoring system bridging enterprise on-premise and cloud-scale monitoring and analytics. With GroundWork, you can collect and analyze all your performance and operational data from a single platform. We bring together performance and availability for your entire application stack and infrastructure. With flexible and customizable workflows, as well as powerful integrations, GroundWork is your central point in IT monitoring data collection and status alerting. We track application health, automatically deploy monitoring, and identify network issues. GroundWork agents, with API-based monitoring, make real-time data gathering a reality. With automated network discovery and device registration, we make it easy to reduce manual intervention.

This is IT monitoring and management done right. Get the full picture and respond quickly to issues. Patch management, remote control, network discovery, all built into one beautiful and easy-to-use solution. Got a minute? That’s how long it takes to deploy and install a powerful and lightweight agent on all of your devices. Within minutes you are provided with detailed information about your IT environment. IT administration is complex but we make your job easier. Automatically discover devices and services in your IT environment. Remote install applications and run scripts. Everything you need in one comprehensive tool. Downtime is unacceptable. Panorama9 foresees problems so you can be proactive instead of reactive. When things do go wrong you are notified instantly and can take action before your users notice anything. Your security is only as strong as the weakest link - we'll tell you where that is.

Cisco Network Assistant simplifies wired and wireless network management for networks up to 80 devices with its intuitive GUI and a task-based menu. Cisco Network Assistant is free and is optimized to apply common services across Cisco switches, routers, wireless controllers, and access points. Through a direct link to Cisco Active Advisor you can view important information pertaining to the products on your network, such as Warranty and Contract Information, Advisories and End of Life notifications. Cisco Active Advisor will be automatically populated with the devices managed through Cisco Network Assistant. Network administrators get a centralized view of the network with Cisco Network Assistant. They also have the flexibility to employ its features across Cisco products for small to midsize businesses or branch offices. Network discovery and convenient display in a topology map. Configuration management of Cisco products fitting small and medium businesses.