Optimize high traffic networks
with PRTG sFlow monitoring

  • Customizable thresholds for prompt notifications in case of disruptions
  • PRTG offers a quick overview of your traffic
  • PRTG features Smart Setup and Auto Discovery for easy installation
  • PRTG provides flexible upgrades
  • PRTG upgrades can be customized with a few scripts 


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

Effective traffic analysis of the industry standard sFlow




i NetFlow is a protocol for collecting, aggregating and recording traffic flow data in a network. NetFlow data provide a more granular view of how bandwidth and network traffic are being used than other monitoring solutions, such as SNMP. NetFlow was developed by Cisco and is embedded in Cisco’s IOS software on the company’s routers and switches and has been supported on almost all Cisco devices since the 11.1 train of Cisco IOS Software.
Read more

Productivity is the Alpha and the Omega

When heavily-utilized computer networks become slower or crash, corporate productivity is impaired, often resulting in financial losses.

Networks which quickly and accurately process and exchange data are an absolute must, and can guarantee trouble-free workflows and the proper “time to market” of your product. For high-traffic networks, it is therefore a good idea to monitor data traffic and available bandwidth. To do so, you can use the industry standard sFlow, and monitor professionally with PRTG.


sFlow technology

sFlow (short for "sampled flow") is a sampling technology for network monitoring invented by InMon. It works similarly to Cisco’s NetFlow, and was first introduced by HP. It stands for “sampled flow,” and uses statistical samples of data traffic to ensure scalability for interfaces with large amounts of data.

sFlow technology puts little strain on the CPU load and data line, and allows for the collection of detailed data. Because PRTG fully supports sFlow Version 5 (the most common version), switches and routers supplying data via sFlow can be monitored with a great deal of ease. PRTG offers several possibilities for individually processing the bandwidth consumption data that is gained as a result of its monitoring, as well as for the data’s subsequent presentation. PRTG lets you configure your dashboard so you can keep a constant eye on your data consumption!


Detect causes of traffic

With 24/7 network monitoring, you can identify the major sources of traffic and eliminate bottlenecks. The PRTG data analysis even allows for suspicious traffic to be detected. The combination of sFlow and PRTG effectively prevents downtime and provides valuable indicators which will enable you to optimize the overall performance of your network.

With PRTG, everyone will work with peace of mind.

Here's what sFlow Monitoring looks like in PRTG


Network Monitoring Software - Version (April 21st, 2020)


Download for Windows and hosted version 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


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


“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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  • 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

3 statistics collected by PRTG for your sFlow monitoring


Bandwidth consumption for individual connections and the entire network



Network activities and causes of traffic according to IP addresses, applications, and protocols



Toplists for a quick overview of the evolution of traffic over various periods of time



How sFlow monitoring works

The sFlow protocol is an industry standard for monitoring data packets in computer networks. Bandwidth utilization data is recorded and summarized inside the router or switch of the device (these processes are referred to as “flows”), while relevant information is sent as UDP packets to PRTG for statistical processing and presentation. With sFlow, you won’t analyze all your data traffic, but only every nth data packet. This method is called “sampling,” and is obligatory for sFlow. With NetFlow, sampling can be configured as required.

When it comes to monitoring bandwidth in high-traffic networks, flow monitoring is recommended the most, for in general it uses very little CPU (in contrast to protocols like packet sniffing) can provide in-depth data analysis while consuming minimal amounts of bandwidth.

To use sFlow monitoring, your network device must support sFlow version 5 and be configured to allow flow data to be sent to PRTG.

Your network traffic 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!


6 Advantages of PRTG


With PRTG, you’ll automatically be informed of network failures, packet losses and protocol errors.


Speed up troubleshooting

Promptly fix errors and prevent network crashes.


Stabilize your network

Reduce unnecessary traffic, improve performance and quickly scale available bandwidth.


Increase productivity

Speed up company processes by optimizing bandwidth. Maximize service availability.


Simplify Analyses

Clear and concise overviews of traffic make it easier to draw conclusions.


Improve security

Discover malware and detect suspicious traffic.

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 PRTG 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.



“The greatest advantage of PRTG? You get to rest easy.“

Steffen Ille, Bauhaus-University of Weimar, Germany.

PRTG: The swiss army knife for sys admins

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
  • New REST API Sensor: Monitor almost everything that provides XML or JSON

German quality

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



Administrators must compare monitoring tools or search for a free one. There are several suppliers on the market.

PRTG comes with a full range of advantages:

1. Free trial version: PRTG is available in a free trial version. Use this version to get a feel for our network monitoring tool with no risk whatsoever.

2. Over 200,000 administrators: whether in large or small businesses, authorities, colleges or administrations - all around the world, more than 200,000 administrators put their trust in our network monitoring tool, and can therefore also monitor their bandwidth. Read our case studies here.

3. Support: do you have a question? We respond in a jiffy! You can already access a great deal of information online by consulting our FAQs, manuals, videos, webcasts, or knowledge base. You can of course also send us a message. We'll do our best to get back to you within 24 hours on business days.

PRTG – your network monitoring tool

PRTG is the Paessler AG all-in-one network monitoring tool. Our software is used by more than 200,000 administrators worldwide, whether it be to monitor their hardware- and server performance , their virtual environments, or the accessibility of their websites. Use PRTG for database monitoring or sql monitoring.  PRTG is a one fits all network analyzer tool.

Save time, worry, and money. PRTG is configured in a matter of minutes. The trial version is offered free of charge. And you can upgrade whenever you like.

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