13 Beste Kostenlose Netzwerküberwachungstools im Test 2026

Nagios is an open-source infrastructure monitoring tool designed for IT professionals and system administrators. It offers monitoring, alerting, and reporting for networks, servers, and applications, making it valuable for network health and performance.

Why I picked Nagios: Nagios is a free, open-source solution that provides core monitoring capabilities. Its flexibility comes from a strong plugin architecture, allowing you to tailor monitoring to your specific needs. With over 50 official plugins included, your team can monitor a wide range of network components. Extensive community support can help you to expand functionality with additional resources.

Standout features and integrations:

Features include strong configuration tools that let you customize Nagios to meet your specific monitoring needs. The community ecosystem is beneficial for helping you troubleshoot and expand Nagios' capabilities. The monitoring wizards provide step-by-step instructions that can make it easier for your team to set up and manage network monitoring tasks.

Integrations are not publicly listed.

What's free?

Nagios has a free-forever plan that offers essential monitoring features without any user or integration limitations.

WhatsUp Gold is a network monitoring solution designed for IT teams and network administrators. It focuses on visualizing network performance, tracking network traffic, and managing network devices.

Why I picked WhatsUp Gold: WhatsUp Gold offers a free trial with access to its intuitive dashboard, which simplifies network visualization and allows you to view performance metrics and device statuses in one place. The tool provides customizable alerts to keep your team informed of any issues. Its user-friendly interface makes it accessible even if you have a limited technical background.

Standout features and integrations:

Features include a log management and archiving system that you can use to monitor, filter, and configure alerts on syslogs. The interactive mapping feature allows you to clearly visualize your network's layout. You can also generate detailed reports to analyze network performance over time with the Virtualization Monitoring module.

Integrations include Salesforce, Microsoft Office 365, and more.

What's free?

WhatsUp Gold offers a limited-time free trial, allowing full access to its features without restrictions, but it is not a free-forever plan.

Zabbix is an open-source observability solution designed for enterprises, focusing on network management, server monitoring, and application monitoring. It caters to IT professionals and system administrators who need a reliable tool for real-time monitoring and analysis.

Why I picked Zabbix: Zabbix offers a free trial of its Zabbix Cloud service, which allows you to explore its real-time monitoring capabilities without upfront costs, while its on-premise software is free and open-source. The platform offers strong flexibility in monitoring various environments, and you can leverage its extensive documentation to set up and customize your monitoring needs. The community forum is also valuable, as it provides resources for troubleshooting and improvements.

Standout features and integrations:

Features include real-time monitoring, which keeps you updated on your network's status. The alerting system is customizable, allowing your team to set specific triggers for notifications. Additionally, Zabbix provides detailed reporting tools for analyzing and visualizing performance data.

Integrations include Microsoft Azure, VMware, Docker, Kubernetes, MySQL, PostgreSQL, and more.

What's free?

Zabbix offers a free edition of the software for on-premise use and a free trial of its Zabbix Cloud service that allows full access to its features.

Spiceworks is a free network monitoring and management tool designed for IT professionals, most suitable for small- to medium-sized businesses. It provides essential features for monitoring network performance, managing devices, and troubleshooting network issues.

Why I picked Spiceworks: Spiceworks offers a free-forever plan with a strong focus on community support through active forums, discussions, and Q&As. It includes features such as live monitoring and status alerts, helping you keep track of your network's health. The tool also provides an intuitive system for visualizing network data.

Standout features and integrations:

Features include real-time insights that can help you keep your network in check. The alert system can promptly notify you of issues targeting any of your web applications. The Connectivity Dashboard is integrated with a help desk that organizes and tracks user requests.

Integrations are not publicly listed.

What's free?

Spiceworks offers a free-forever plan with no limitations on users or integrations, focusing on community-driven support.

Grafana Cloud is an open-source data visualization tool used primarily by IT professionals and data analysts. It allows users to create interactive and customizable dashboards to monitor and analyze various data sources.

Why I picked Grafana Cloud: Grafana Cloud offers a free-forever plan that allows access to 10,000 Prometheus metrics and 50 GB of logs, traces, and profiles. This plan includes customizable dashboards, allowing you to tailor data visualization to your needs. The tool also supports over 20 enterprise data source plugins, providing flexibility in monitoring. Grafana's focus on customization makes it a valuable choice for users who want detailed and personalized data insights.

Standout features and integrations:

Features include performance testing, which can help you assess the efficiency of your network. The alerting system is customizable, allowing your team to set specific thresholds for notifications. Grafana Cloud also offers incident and on-call management tools to optimize response workflows for network issues.

Integrations include Amazon Web Services, Azure, Cloudflare, CrowdStrike Falcon LogScale (formerly Humio), and more.

What's free?

Grafana Cloud offers a free-forever plan with access to 10,000 Prometheus metrics, 50 GB of logs, and over 20 enterprise data source plugins.

Paessler PRTG is a network monitoring tool designed for IT administrators and managers. It helps in monitoring network performance and identifying issues through a sensor-based approach.

Why I picked Paessler PRTG: Paessler PRTG offers a freeware solution that allows you to monitor up to 100 sensors, which is suitable for small- to medium-sized networks. It comes with over 250 types of native sensors, and each sensor monitors a different aspect of the network, such as bandwidth or CPU usage. The tool's flexibility in setting up sensors makes it a strong choice for varied monitoring needs.

Standout features and integrations:

Features include customizable alerts to notify you of network issues based on specific thresholds and rules adapted to your priorities. The firewall analyzer lets you visualize network data in graphs and dashboards. You can also set up maps of your network's structure to help you understand its layout at a glance.

Integrations include Amazon Web Services, VMware, Cisco, Dell Technologies, HPE, and more.

What's free?

Paessler PRTG offers a free-forever plan that includes monitoring for up to 100 sensors without any user limitations.

Cacti is an open-source network monitoring and graphing tool suitable for network administrators and IT professionals. It specializes in providing detailed graphs of network performance metrics, helping users visualize and analyze data effectively.

Why I picked Cacti: Cacti offers a free-forever solution that focuses on graphing network data. With its templates and automation features, you can efficiently set up and manage network graphs. The tool supports data collection from various sources, offering flexibility in monitoring.

Standout features and integrations:

Features include a Devices system that can be used to create and manage graphs with specific attributes and meta information. Cacti offers multiple data acquisition methods, which adds to its flexibility. It also supports router configuration backup and has a scheduler that can be used to create custom network discovery rules.

Integrations are not publicly listed.

What's free?

Cacti offers a free-forever plan with no restrictions on users or integrations, focusing on graphing capabilities.

OpenNMS is an open-source network monitoring platform aimed at IT professionals and network administrators. It offers full network performance monitoring and management capabilities.

Why I picked OpenNMS: OpenNMS is available as a free open-source solution that emphasizes extensibility through plugins. You can customize the tool to fit your specific monitoring needs. The platform supports a wide range of monitoring services, from performance metrics to event management. Its open-source nature allows your team to contribute and expand its capabilities.

Standout features and integrations:

Features include advanced event management, which helps your team track and respond to network incidents. The platform provides detailed performance monitoring, offering insights into network health. OpenNMS also offers a flexible architecture, allowing you to tailor the system to your specific requirements.

Integrations include Slack, Mattermost, Jira, Grafana, Remedy, and more.

What's free?

OpenNMS offers a free-forever plan called Horizon with no restrictions on the number of users or integrations, focusing on extensibility and customization.

Wi-Fi Network Monitor is a Windows app designed to help you keep an eye on your network devices and traffic in real time. It provides your team with a simple way to see how data moves across your network so you can catch issues early. 

Why I picked Wi-Fi Network Monitor: It can be installed directly from the Microsoft Store, so it can naturally integrate into your existing Windows setup. You and your team can use it inside the familiar Windows environment instead of learning a different tool layout. 

Standout features and integrations:

Features include real-time views of download, upload, and bandwidth use so you can see how your connection changes over time. You can track which devices are on your network and how much traffic they’re sending or receiving, making it easier for you and your team to notice unusual activity or heavy use without having to navigate various Windows system menus.

Integrations are not publicly listed.

What’s free?

It’s a free-forever app with no paid tiers, and all features available on the Microsoft Store listing are included at no cost.

Icinga is an open-source network monitoring tool built for teams that need visibility across complex IT environments. It allows you to monitor network devices, services, and infrastructure components while adapting the setup to your organization’s specific needs through modules and plugins.

Why I picked Icinga: Icinga stands out for its modular architecture, which lets you customize monitoring based on what you actually need instead of relying on a fixed feature set. You and your team can extend functionality using plugins and integrations, making it well suited for environments that require flexibility and scalability.

Standout features and integrations:

Features include real-time monitoring of network services, hosts, and performance metrics with customizable alerts to notify your team of issues. Its plugin-based system allows you to add monitoring capabilities for different protocols, devices, and applications, while the web interface gives you visibility into system health and alert status.

Integrations include Grafana, Terraform, AWS, Azure, Jira, ServiceNow, and more.

What's free?

Icinga offers a free forever plan with unlimited hosts, customizable monitoring, multi-environment support, integrations with Grafana and Prometheus, and automation via API or tools like Ansible and Puppet.