How To: Free network monitoring

How to use 100 sensors to keep an eye on
critical points in your IT – at no cost





What's the difference between PRTG Network Monitor and PRTG Enterprise Monitor?

Learn more






Kostenloses Monitoring mit PRTG Network Monitor

The Nuremberg-based company Paessler AG's PRTG is a professional solution for monitoring complete IT environments. From hardware and virtualized environments to data traffic and applications, PRTG monitors availability and performance. The price of the solution is based on the number of 'sensors' used – that’s what Paessler calls the individual measuring points. Every license, even the free PRTG 100, offers the complete range of functions.

Paessler offers 100 sensors in the free version.

Implemented as a comprehensive monitoring solution, this 100-sensor version is sufficient for a small company network or large home network. However, it can also be an interesting option for monitoring critical points in a larger network.


PRTG Network Monitor 

Free Download

Fully functional 30-day trial version.


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Get more information, a demo, or a quote.


Examples of usage for PRTG 100


Syslog/Trap manager

In this first example, PRTG 100 is used as Syslog and SNMP trap receiver. Syslogs and SNMP traps deliver a lot of information to devices in the form of text messages, which are delivered to a corresponding receiver.

A single Syslog Receiver or SNMP Trap Receiver Sensor can theoretically be used to monitor an entire network: Under lab conditions (one single sensor without filters), PRTG could handle 10,000 messages per second (Syslog or trap) on a quad core desktop machine, so the software offers more than enough power reserves.

The messages are collected and can be filtered and sorted, then serve as a basis for alerts, notifications and reports. You’re left with 99 sensors that can be used as Syslog and SNMP trap receivers for individual, important devices or for other purposes entirely.



Website monitoring

A website is a company's business card, showcase and retail outlet. However, if just entering a shop takes too long, most customers won’t even come in. Constant, comprehensive monitoring is necessary in order to guarantee fast response times and general availability of a website.

With 100 sensors, the free version offers enough options for comprehensive monitoring of one or more websites. For example, the HTTP sensor can be used to monitor general availability, while the HTTP Full Web Page sensor measures the time needed to load an entire page. One can monitor specific website content for changes, or use the HTTP Transaction sensor to monitor processes like logins or filling out and sending forms.

Because PRTG 100 also includes remote probes, these can be distributed worldwide to monitor the availability and reaction time of websites from other countries. Website operators can ensure that their sites are available for international customers as well. In addition, some sensors can be used to monitor the web server or backup processes, for example.


Secure email traffic

Email is still the main means of communication in most companies. Any disturbances in email traffic can have grave consequences. Consistent monitoring sends alerts before interruptions or failures occur and cause severe damage.

PRTG offers numerous predefined sensors for securing email traffic, including the Email Round Trip Sensors, which monitor the entire sending and receiving cycle of an email. In addition, dedicated Exchange, IMAP, POP or SMTP sensors can be used to monitor single key components efficiently and thoroughly.


Database monitoring

Databases are another critical point in many companies. Whether internal systems or websites, the performance of many processes is directly dependent on the performance of the underlying database.

PRTG 100 offers predefined SQL sensors (MySQL, Microsoft SQL, ADO SQL and Oracle SQL) for in-depth SQL database monitoring. To this end, one sensor monitors various standard parameters, while still permitting custom SQL queries, so that the monitoring can easily be adjusted to fit individual requirements.


Printer monitoring

Printers are generally not as integral to a company as databases, email or websites, but broken printers, empty toner or print jams often make for annoyed users. Up to 50 printers can be monitored with the PRTG 100, if two sensors are used per printer:

  • One sensor that monitors the toner levels, queue, paper, etc.
  • A second sensor that monitors statistic values, like printed pages

With the PRTG Maps feature – which involves easy-to-create HTML pages – printers can be displayed on a blueprint of the office, so the administrator immediately knows where the printer needing maintenance is located. The internal ticketing system can be used to create tickets and assign them directly to the responsible colleague.

In addition, the free PRTG 100 can be used as a free and powerful alternative for some scenarios that, at first glance, seem to require expensive special solutions.


Flow monitoring

Functions that are usually available for purchase as add-ons for other standard monitoring solutions are included in PRTG.

PRTG 100 can be used in a small scope to monitor routers and switches using flow protocol. A flow sensor (PRTG supports NetFlow, sFlow, jFlow and IPFIX) processes a flow stream from a router or switch. In this way, the free PRTG version can monitor up to 100 flow-capable devices for free and analyzes the traffic that runs on these devices.

PRTG does not aim to replace highly specialized flow solutions with its flow sensors, but helps administrators to maintain a quick overview of top talkers, top protocols and top connections in day-to-day work.


VMware host monitoring

Like flow monitoring, monitoring VMware environments usually requires expensive special solutions or add-ons. And, like flow sensors, VMware sensors are included in PRTG's range of functions.

PRTG 100 can be used to augment VMware's integrated monitoring with an alarm and reporting tool.

Over dedicated VMware host sensors, PRTG can read out and process comprehensive performance data. In addition, PRTG can also monitor the hardware on which the VMware host operates.


And many more...

PRTG offers more than 250 predefined sensor types, which open up a whole realm of further usage scenarios for PRTG 100.

These can be used to monitor firewalls, storage solutions, Active Directory or virus scanners and much more. The FritzBox sensor is an especially interesting option for home users or small companies.


Get started today with free PRTG monitoring and a quick and easy overview of all your servers.

PRTG can be started within minutes and it's compatible with many mobile devices.


PRTG comes with all the features you need, plus more your IT infrastructure won't want to live without.


PRTG monitors these vendors and applications, and more, in one view!



Trusted by 500,000 users and recognized
by industry analysts as a leader

“Fantastic network and infrastructure monitoring solution that is easy to deploy and easier still to use. Simply the best available.”

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“Software is absolutely perfect, Support is superior. Meets all needs and requirements, this is a must have solution if you are needing any form of monitoring.”

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“The tool excels at its primary focus of being a unified infrastructure management and network monitoring service.”

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PRTG Network Monitor 

Free Download

Fully functional 30-day trial version.


Talk to an expert

Get more information, a demo, or a quote.



PRTG The Swiss Army knife

PRTG: The Swiss Army knife for sysadmins

Adapt PRTG individually and dynamically to your needs relying on a strong API:

  • HTTP API: Access monitoring data and manipulate monitoring objects using HTTP requests
  • Custom Sensors: Create your own sensors for customized monitoring
  • Custom Notifications: Create your own notifications to send alarms to external systems
  • REST Custom Sensor: Monitor almost everything that provides XML or JSON


PRTG simplifies your day

Our monitoring software works for you and promptly notifies you of potential issues.
It frees you to concentrate on your day-to-day tasks with peace of mind.


PRTG saves time

With PRTG, you get one central monitoring tool for your servers and entire network. Enjoy a quick overview of your whole infrastructure via our dashboard and app.

PRTG saves worry

Customizing PRTG is a breeze. Getting started or switching from another network monitoring tool is easy thanks to the auto-discovery and pre-configured device templates.

PRTG saves money

80% of our customers report substantial or even exceptional cost savings in the area of network monitoring. The experience shows that the costs for licenses have paid for themselves within a matter of weeks.



What's the difference between
PRTG Network Monitor & PRTG Enterprise Monitor?


PRTG Network Monitor


is the right solution for you if


  • you need to monitor up to about 500 to 1,000 devices 
  • knowing every detail about network and infrastructure is your main requirement 
  • you need one easy-to-use monitoring tool for a small or midsize IT environment 


 Free Download

Fully functional 30-day trial version


is the right solution for you if


  • you need to monitor more than 1,000 devices 
  • you are looking for a management overview in addition to all the details 
  • you are responsible for a large and distributed IT environment



Get more information, a demo, or a quote.



Network Monitoring Software - Version (December 1st, 2021)


Download for Windows and cloud-based version PRTG Hosted Monitor available


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Up to 100 sensors for free (Price List)

Unified Monitoring

Network devices, bandwidth, servers, applications, virtual environments, remote systems, IoT, and more

Supported Vendors & Applications


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