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Free network tools
from Paessler

On this web page we provide free network monitoring tools from our labs. The set of free network tools includes "top sellers" as PRTG Network Monitor, as well as small but useful helpers for your daily work. We also use these network monitoring tools to manage our own network and to diagnose and test our software products. All these programs are provided for free. Please understand that we can not provide one-to-one technical support for these products. Please ask questions in our Knowledge Base.


Free Download

  • Unlimited version of PRTG for 30 days
  • After 30 days, PRTG reverts to a free version
  • Or, you can upgrade to a paid license anytime

Tobias, QA Engineer at Paessler AG


PRTG Network Monitor:
Our flagship product

Do you want to monitor a network of 10, 100 or 1000 nodes? Looking for a reliable and professional network monitoring software that is easy to set up? You have come to the right place!

With the freeware of PRTG you can start with reliable monitoring for your network in less than 5 minutes.

We have embedded 15 years of monitoring experience into our software so you don't have to worry about the technical details.

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Why you should use network tools

In order to correctly manage your networks, you absolutely need appropriate network tools. Whether you are troubleshooting network problems, optimizing performance or improving your asset utilization - network tools help you achieve your goals reliably and efficiently.

There are different kinds of tools which you can use for your daily work as an admin. Tools like the Webserver Stress Tool or the MIB Importer are perfect for a specific task. Other network tools combine several functions or are great All-in-One Products. PRTG is your efficient solution for managing and monitoring your entire network.

Our free network monitoring tools:

Multi Protocol Device Simulation

Multi Server Simulator

For testing purposes, Multi Server Simulator simulates large, virtual HTTP, FTP, SMTP, or DNS server networks, as well as SNMP-based network switches using a standard Windows PC. It is an indispensable tool for the evaluation and testing of network management and network testing tools.

More info and download


MIB Importer

Imports SNMP MIB (Management Information Base) files and converts them into OID libraries for PRTG Network Monitor.

More info and download



SNMP Tester

SNMP Tester can run simple SNMP requests against a device in a network to debug SNMP requests down to the protocol level in order to find communication and/or data problems in SNMP monitoring configurations.

More info and download

Certificate Related Tools

PRTG Certificate Importer

The PRTG Certificate Importer eases the installation of a trusted certificate on your PRTG server to avoid the browser's SSL certificate warning when you access the PRTG web interface. It combines and converts all files issued by a certificate authority (CA) automatically for the use with PRTG and saves the certificate files into the correct path on your PRTG server. This makes importing a trusted SSL certificate rather comfortable!

More info and download

NetFlow and sFlow Tools

NetFlow Generator

Simulates Netflow v5 data streams and can be used to test the NetFlow functionality of PRTG Network Monitor and other NetFlow v5 compatible programs

More info and download



NetFlow Tester

NetFlow Tester simply dumps the data of all NetFlow packets that a computer receives from a Cisco router - useful when debugging bandwidth monitoring configurations based on NetFlow protocol. Available for NetFlow v5, v9, and IPFIX.

More info and download



sFlow Tester

This program dumps the data of all sFlow packets that a computer receives from an sFlow enabled router - useful when debugging bandwidth monitoring configurations based on sFlow protocol.

More info and download

WMI Tools

WMI Tester

Tests the accessibility of WMI (Windows Management Instrumentation) counters in a quick and easy manner.

More info and download

HTTP Web Server Tools

Webserver Stress Tool

Webserver Stress Tool is a powerful HTTP-client/server test application designed to pinpoint critical performance issues in your web site or web server that may prevent optimal experience for your site's visitors.

More info and download

200,000 system administrators worldwide
trust our software. Every day.


  • Unlimited version of PRTG for 30 days
  • After 30 days, PRTG reverts to a free version
  • Or, you can upgrade to a paid license anytime