PRTG is your professional
SNMP port analyzer


  • Individual port
    bandwidth monitoring

  • Port


  • Avoid port
    exhaustion with PRTG


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.






Monitor your ports with SNMP


Individual port bandwidth monitoring

Would you like to have detailed traffic reports on each port of your device? 

Port notification

You can be alerted if your TCP/IP ports are open or closed.

Avoid port exhaustion

Have you ever run out of ports to your application servers and wish you were notified? PRTG can alert you so you know in advance before your ports are all used.


How PRTG can help


 i What is a sensor?

In PRTG, “sensors” are the basic monitoring elements. One sensor usually monitors one measured value in your network, e.g. the traffic of a switch port, the CPU load of a server, the free space of a disk drive. On average you need about 5-10 sensors per device or one sensor per switch port.

View video (3:26 min.)


SNMP Traffic Sensors

SNMP Traffic Sensors

PRTG can help solve all of these issues for you. Our SNMP Traffic Sensors will monitor your overall device, plus each individual port so you get the detailed overall picture. In addition, PRTG can send you notifications so you know if your TCP/IP and UDP ports are available or not.

Network communication

Network communication

Communication in every infrastructure relies on the network. If one switch runs out of ports then there is a server, client machine or a device that will not be able to communicate with the rest of the infrastructure. A breakdown like that can cause a delay in business and a loss of productivity or profit.

Optimize your infrastructure

Optimize your infrastructure

With PRTG you can avoid being surprised with port exhaustion. You can also monitor the bandwidth and usage of your switches and routers on a port-by-port basis. By default, PRTG keeps raw data for a year so you can track trends to help you optimize your infrastructure. It is always better to know about a problem before it happens rather than after and PRTG can help you do that. 


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.


4 Sensors for your SNMP port analyzer

SNMP Traffic Sensors

SNMP Traffic Sensors

PRTG uses SNMP to collect information about your ports on your routers and switches. The channels in the SNMP Traffic Sensor includes Discards In/Out, Errors In/Out, Non-Unicast In/Out, Traffic In/Out/Total, Unicast In/Out and Downtime.

Sensor Factory Sensor

Sensor Factory Sensor

If you want to average or total the channels from various ports you can use the Sensor Factory Sensor to do calculations from several different sensors and report/alert on the averages or totals. 

Port Sensor

Port Sensor

The PRTG Port Sensor will monitor each individual port by connecting to its TCP/IP port number and you can configure PRTG to let you know if the port is open or closed. You can also send the port a command through a telnet session through the sensor and have PRTG check the response.


Port Range Sensor

Port Range Sensor

The Port Range Sensor monitors and alerts on a range of ports on a network service or device. It can show the number of open ports, the number of closed ports, and the time it takes for the request to be accepted. You can also set alerting limits for the number of closed or open ports.

Need more info

Need more info?

See our PRTG Manual for detailed configuration instructions. 


This is what SNMP monitoring
looks like in PRTG


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.



“We can all work with greater peace of mind knowing
that our systems are constantly being monitored.”

Markus Puke, Network Administrator, Schüchtermann Klinik, Germany


Your SNMP monitor at a glance
– even on the go

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.”

Read more reviews

“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.”

Read more reviews

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

Read more reviews


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.



Support: Problems with SNMP monitoring? Put the PRTG Tester to work!

Having an issue with your SNMP monitoring? A sensor reports an error - but you can't see why? Use our SNMP Tester to get to the root of the problem. With this tool, you can make SNMP inquiries and obtain detailed log files. If you cannot find the bug, simply send the log files to our support team. In this way, we can help to solve your problem. 



“Hey Luciano, what would you tell administrators looking to set up SNMP monitoring with PRTG?”

“With PRTG, you not only get the many standard sensors which exist for SNMP monitoring, but also the ability to monitor devices even without having a native sensor for them. You can thus monitor practically any SNMP-compatible device! First of all, obtain the relevant MIB file containing a definition of all available OIDs from the manufacturer of your hardware. Then use the MIB importer to make the MIBs available to PRTG, and create an SNMP library sensor. Finally, select the properties of the target device you’d like to monitor, and within no time at all you’ll have the data you need!”

Luciano Lingnau works in PAESSLER AG's technical support department. Find out more on this topic by consulting his answer in our knowledge base.


Over 95% of our customers recommend PRTG


Paessler AG worldwide trialled PRTG in over 600 IT departments.
The aim was to tune the network monitoring software closer to the needs of the administrators.
The result of the survey: over 95% of the participants would recommend PRTG - or already had.

Recommend PRTG


email course snmp monitoring

TIP: You are still new to SNMP monitoring and need a
little support?

Paessler offers a free, 4-part email course on how to use SNMP for network monitoring which will help you improve your network operations.

Sign up here for our free email coaching and learn to use SNMP in the best way.


Still not convinced?



More than 500,000 sysadmins love PRTG

PRTG is used by companies of all sizes. Sysadmins love PRTG because it makes their job a whole lot easier.

Still not convinced?


Monitor your entire IT infrastructure

Bandwidth, servers, virtual environments, websites, VoIP services – PRTG keeps an eye on your entire network.




Free Download



Try PRTG for free

Everyone has different monitoring needs. That’s why we let you try PRTG for free. Start now with your 30-day trial.




Network Monitoring Software - Version (September 21st, 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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