Paessler PRTG

Fix network performance issues fast with the network sniffer PRTG


  • Sniff out, capture, and analyze data packets
  • Monitor traffic across your entire network
  • Filter by IP address, protocol, and data type

Our users give top ratings for monitoring with Paessler PRTG



PRTG makes network sniffing easy

Custom alerts and data visualizations make it easy to monitor, identify, and prevent network performance issues.







Free sniffer: Having a nose for trouble saves hours of frustration

Because enterprise networks have so many moving parts – hardware, applications, and databases – diagnosing the cause of a performance issue can feel like looking for a needle in a haystack.

We've all been there. Hours (or days) tracking down a failed switch, or working out why a critical app isn't running properly… while busy colleagues sit around and wait, and your boss breathes down your neck.

Paessler PRTG monitors traffic across your entire network and sniffs out issues before your system crashes, saving you time, stress, and frustration.


3 reasons why to choose PRTG to sniff out network issues

Get instant diagnostics

Don't tear your hair out trying to get to the root of a network problem. Whether it's a glitchy protocol, an issue with data packet transfers, IP addresses, or something else, PRTG alerts you immediately and shows you what and where to check, so you can fix things double quick.

Enjoy all-in-one monitoring

Keep an eye on your whole network from one place. Alongside monitoring traffic, PRTG has preconfigured sensors for servers, routers, switches, and major database and cloud environments. Plus, it grows with your network, no matter how complex it gets.

Try now, pay later

Yes, really. Access PRTG's full feature set — including the alerting and customizable notification system, reporting, and all of our 250+ preconfigured sensors – for 30 days, 100% free. You don't have to buy a license if you don't think it's the right tool for you.


Start monitoring your network's traffic with PRTG and see how it can make your network more reliable and your job easier.




IT experts agree: Paessler PRTG is a great solution for IT infrastructure monitoring


“All-around winning
network monitor”

logo it brief

“The real beauty of PRTG is the endless possibilities it offers”


“PRTG Network Monitor
is very hard to beat”


What network packet sniffing looks like in PRTG

Diagnose network issues by continuously monitoring data packets. Show the volume and sources of traffic across your entire network in real time and visualize data in graphic maps & dashboards to identify problems more easily. Gain the visibility you need to troubleshoot dips in your network's performance.



How PRTG network sniffer works

 i How PRTG defines sensors

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.)

PRTG uses sophisticated sensors to continuously log inbound and outbound traffic across your network, analyze the content of data packets, and alert you if there are issues. Each sensor tracks a specific metric, enabling you to pinpoint (or exclude) the reason for network disruption straight away.

With our preconfigured Packet Sniffer sensor, you can track, for example:

  • Total traffic
  • Web traffic
  • Email traffic
  • File transfers
  • Top talkers
  • Top connections
  • Top protocols

Combine it with any other of PRTG’s 250 preconfigured sensors to conduct more in-depth analysis, and track the health and performance of all your hardware, cloud and virtualization environments (VMware, Hyper-V, AWS…), databases (MySQL, Microsoft SQL, Oracle SQL, PostgreSQL…), and more.


Easily find the source of the problem with our PRTG network sniffer solution

Real-time alerts and custom notifications make it easy to solve network performance issues.



PRTG is compatible with all major vendors, products, and systems

vendors applications blue


Watch our video tutorial: Flow and packet sniffing


Start monitoring your network's traffic with PRTG and see how it can make your network more reliable and your job easier.




Your network sniffer for Windows at a glance – even on the go

Set up PRTG in minutes and use it on almost any mobile device.


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 in one view!


vendors vm ware



Create innovative solutions with Paessler’s partners

Partnering with innovative vendors, Paessler unleashes synergies to create
new and additional benefits for joined customers.


baramundi and PRTG create a secure, reliable and powerful IT infrastructure where you have everything under control - from the traffic in your firewall to the configuration of your clients.

Read more


With ScriptRunner, Paessler integrates a powerful event automation platform into PRTG Network Monitor.

Read more


UVexplorer integrates tightly with PRTG to bring fast and accurate network discovery, detailed device inventory, and automatic network mapping to the PRTG platform.

Read more



PRTG makes network sniffing easy

Custom alerts and data visualizations make it easy to monitor, identify, and prevent network performance issues.





“Excellent tool for detailed monitoring. Alarms and notifications work greatly. Equipment addition is straight forward and server initial setup is very easy. ...feel safe to purchase it if you intend to monitor a large networking landscape.”

Infrastructure and Operations Engineer in the Communications Industry, firm size 10B - 30B USD

Read the entire review at Gartner Peer Insights 


Network sniffer: FAQ


1. What is a network sniffer tool?

A sniffer (also known as network analyzer or packet analyzer) is a software that can intercept and log traffic on a network. The tool captures each packet that flows across the infrastructure and analyzes its content.

PRTG is a proprietary software that shows you, as a network sniffing tool, how much traffic is flowing through your network and where it's coming from in real time. It logs every data packet and analyzes its content, so it's quick and easy to track how much bandwidth you're using and troubleshoot performance issues.

2. Why use a network sniffer?

Because it helps you identify and address network performance issues before it's too late. It's like having a personal guard dog with a highly sensitive nose, continuously sniffing for signs of trouble. But a network sniffer isn't just for troubleshooting. It's also useful for the following:

  • Tracking bandwidth usage spikes (and dips)
  • Analyzing your network's overall performance
  • Identifying and pinpointing unusual traffic in your network
  • Collecting data for security analysis in your infosec team

3. Should I use the free network sniffer or the full version?

The simple answer is: it depends (and no, we're not trying to sidestep the question). The free sniffer tool is perfect for diagnosing a specific problem, or if you have a small network and only need to monitor traffic from limited sources. But if you have a larger, more complex network and need comprehensive monitoring, alerting, and reporting, the full version is probably the better choice. Still unsure? Try the full version for 30 days, completely free. No catches.

4. How much does PRTG hard disk monitor cost?

We're so confident you'll love PRTG that it comes with a free, no-obligation 30-day trial. Should you decide to keep using it, you can find our pricing list here.

5. What is a sensor in PRTG?

In PRTG, “sensors” are the basic monitoring elements. One sensor usually monitors one measured value in your network, for example the traffic of a switch port, the CPU load of a server, or the free space on a disk drive.

On average, you need about 5-10 sensors per device or one sensor per switch port.


PRTG the multi-tool

PRTG: The multi-tool for sysadmins

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

  • HTTP API: Access monitoring data and manipulate monitoring objects via HTTP requests
  • Custom sensors: Create your own PRTG sensors for customized monitoring
  • Custom notifications: Create your own notifications and send action triggers to external systems
  • REST Custom sensor: Monitor almost everything that provides data in XML or JSON format


We asked: would you recommend PRTG?
Over 95% of our customers say yes!


Paessler AG conducted trials in over 600 IT departments worldwide to tune its network monitoring software closer to the needs of sysadmins.
The result of the survey: over 95% of the participants would recommend PRTG – or already have.


Recommend PRTG


Still not convinced?


More than 500,000
sysadmins love PRTG

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


Monitor your entire IT infrastructure

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


Try Paessler PRTG
for free

Everyone has different monitoring needs. That’s why we let you try PRTG for free.



Paessler PRTG 

Start monitoring your network's traffic with PRTG and see how it can make your network more reliable and your job easier.



Network Monitoring Software - Version (May 2nd, 2024)


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


English, German, Spanish, French, Portuguese, Dutch, Russian, Japanese, and Simplified Chinese


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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