Best Free Network Bandwidth Monitoring Tools of 2025

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 serves as an advanced solution for monitoring network bandwidth, offering IT teams comprehensive insights into traffic behaviors and bandwidth consumption throughout the network. By utilizing flow technologies like NetFlow, sFlow, J-Flow, and IPFIX, OpManager collects detailed traffic data to pinpoint leading talkers, applications, protocols, and interactions that are utilizing bandwidth. This capability enables administrators to identify network bottlenecks, unexpected surges, and possible misuse, facilitating strategic capacity planning and expedited troubleshooting. With user-friendly dashboards, real-time traffic visualizations, and configurable alerts, OpManager equips organizations to optimize bandwidth efficiency, improve network performance, and maintain seamless service delivery.

Obkio is a simple Network Monitoring and Troubleshooting SaaS solution that allows users to continuously monitor the health of their network and core business applications to improve the end-user experience. Obkio identifies the cause of intermittent network problems, VoIP, video, and applications slowdown in seconds so you can troubleshoot before they affect your end-users. Deploy network monitoring Agents at strategic locations in a company's offices or network destinations such as data sites, remote sites, external client sites, or public or private clouds to continuously monitor performance using synthetic traffic exchanged every 500ms. Obkio continuously tests and measures network metrics, such as latency, jitter, packet loss, quality of service and customer experience via QoE (Quality of Experience). The app alerts you as soon as a problem occurs or even if there are signs that a failure is about to happen. Not only does it alert you and pinpoint the source of the issue, but it also allows you to go back in time to complete a diagnosis.

NetFlow Analyzer provides real-time visibility to network bandwidth performance and leverages flow technologies. NetFlow Analyzer provides a comprehensive view of your network bandwidth usage and traffic patterns. It has been used to optimize thousands of networks worldwide. NetFlow Analyzer provides a single solution that analyzes, reports, and collects data about your network's bandwidth usage. NetFlow Analyzer can help you optimize bandwidth usage across more than a million interfaces worldwide. It also provides network forensics, network traffic analysis, and network forensics. To gain control over the most used applications, you can reconfigure policies using traffic shaping via ACLs and class-based policies. NetFlow Analyzer uses Cisco NBAR technology to provide deep visibility into Layer 7 traffic. It can also identify applications that use dynamic port numbers, or hide behind known ports.

Zabbix stands out as a premier enterprise-level tool created for the real-time observation of vast amounts of metrics gathered from numerous servers, virtual machines, and network devices. As an Open Source platform, Zabbix offers its powerful features at no cost. It automatically identifies problematic states within the incoming flow of metrics, eliminating the need for continuous manual monitoring. The built-in web interface allows for various visual presentations of your IT landscape, enhancing usability. With Zabbix's Event correlation mechanism, you can reduce the influx of repetitive notifications and concentrate on identifying the root causes of issues. It facilitates automated monitoring for large, dynamic environments and supports the development of a distributed monitoring system while maintaining centralized oversight. Furthermore, Zabbix can seamlessly integrate with all components of your IT infrastructure, and users can access its comprehensive functionalities from external applications via the Zabbix API. This integration capability ensures that Zabbix remains adaptable to a variety of operational needs.

BitMeter OS is a completely free and open-source tool designed for monitoring bandwidth, functioning seamlessly across Windows, Linux, and macOS platforms. It effectively tracks internet and network usage, providing insights through a web-based interface or command-line options. The web interface features real-time graphs and charts that refresh every second, showcasing ongoing connection activity. Users can delve into specific bandwidth utilization for chosen dates, with the capability to export this data into spreadsheet formats. The History pane offers a visualization of usage trends across various time frames, including hours, days, and months. Furthermore, BitMeter OS empowers users to establish customizable alerts that trigger when internet usage exceeds set limits. An additional calculator utility is available to estimate both upload and download times alongside data transfer capacities. The Preferences pane allows for personalization of the interface, complete with a built-in RSS feed for updates. It is important to note that BitMeter can only monitor network traffic that is directed to or from the computer it is installed on; thus, for monitoring multiple machines, installation on each one is necessary. This ensures that users can fully utilize its capabilities across their networked devices.

Tessabyte Throughput Test allows you to test the performance of your wireless or wired network. This utility continuously sends TCP or UDP data streams over your network. It computes important metrics such as upstream and downstream throughput values, packet losses, and round-trip times, and displays results in numeric and chart format. It allows users to evaluate network performance based on Quality of Service settings. It supports IPv4 and IPv6. The application also offers a variety of other features, including the ability to generate reports, schedule tests in advance, and customize payloads. Tessabyte is used for network topology planning and network topology testing, as well as load balancing, SLA compliance, and hardware compatibility tests.

Cisco ThousandEyes is an innovative platform for network intelligence that equips organizations with profound insights into digital interactions across various environments, including the internet, cloud, and enterprise networks. Utilizing sophisticated monitoring and analytics capabilities, ThousandEyes enables businesses to identify, troubleshoot, and rectify performance challenges that affect essential applications, websites, and services. Its extensive array of tools delivers valuable information regarding network performance, application delivery, and user engagement, allowing organizations to maintain uninterrupted connectivity and enhance user experiences. This platform is widely embraced by Fortune 500 companies and SaaS providers alike, establishing itself as a reliable solution for navigating the intricacies of contemporary hybrid and multi-cloud landscapes. Additionally, ThousandEyes empowers IT teams by equipping them with the tools needed to proactively manage, optimize, and refine their digital infrastructures for improved operational efficiency.

Icinga is an internet monitoring system that checks the availability of your network resources and notifies users when there are outages. It also generates performance data for reporting. Icinga is flexible and extensible. It can monitor complex environments in multiple locations. Icinga 2 is the monitoring server and requires Icinga Web 2 on top in your Icinga Stack. You can manage the configuration with the Icinga Director or config management tools. Plain text is also available within the Icinga DSL. Find solutions, take action and become a problem-solver. Flexibility is key. Keep curious, stay passionate, and stay in the loop. Tackle your monitoring challenge. The Icinga stack consists of six core strengths that cover all aspects related to monitoring. You can get valuable insights, on-time notifications and eye-opening visuals as well as analytics. Icinga integrates easily into your systems and gives you the power of automating your tasks.

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.

NetFlow Analyzer provides net admins with an easy way to understand bandwidth consumption, trends, applications and traffic anomalies. It visualizes traffic by network devices, interfaces, subnets, traffic segments, and end users. NetFlow Analyzer uses Cisco® NetFlow (IPFIX, NSEL and sFlow), and other compatible netflow-like protocols. It assists net admins in bandwidth monitoring, network traffic investigation and reports. Companies can optimize their networks and applications, plan for network expansion, reduce time spent on troubleshooting, diagnostics, and increase security. NetVizura allows users to define custom traffic to monitor based on IP subnets, traffic characteristics such as protocol and service used. You can monitor specific traffic for each unit of your network, such as remote sites, departments, and collections of regional offices, by identifying them using IP subnets.

Dynamic scalability is essential for effective data processing, allowing the monitoring of numerous data points through a distributed, tiered architecture. An event-driven framework enhances the capabilities of service polling and data collection, enabling versatile integration of workflows. OpenNMS serves as a robust open-source network monitoring tool that allows users to visualize and oversee their local and distributed networks seamlessly. With a focus on comprehensive fault detection, performance evaluation, traffic oversight, and alarm generation, OpenNMS consolidates these capabilities into a single platform. Its high level of customization and scalability ensures that OpenNMS can be effectively integrated with essential business applications and workflows, making it a vital asset for organizations aiming to optimize their network management. This adaptability enhances the overall efficiency of monitoring processes, ensuring that businesses can respond swiftly to network challenges.