PRTG monitors the latency
of your network

  • Keep a constant eye on QoS, including latency
  • Be promptly alerted in the event of latency spikes
  • Take action immediately


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


Trusted by 200.000 users and recognized by industry analysts as a leader




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.

Latency, ping times, and much more: 3 sensors to get you on your way



PRTG comes with several QoS sensors. These include the QoS (Quality of Service) Round Trip Sensor, which measures the quality of service along an entire route.

More on QoS monitoring with PRTG



Many Cisco devices gather their own QoS values. The Cisco IP SLA Sensor reads these values and adds them to your centralized monitoring statistics.

More on IP SLA monitoring



The PRTG Ping Sensor checks the availability of your devices, while the dashboard lets you see if everything is OK in your network.

More on ping monitoring


iWhat 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.)

Latency recommendations: ITU-T vs. PAESSLER



The Telecommunication Standardization Sector of the International Telecommunication Union (ITU-T) is responsible for standards in the field of telecommunications.  It provides many recommendations with regard to quality of service. When it comes to latency, the ITU-T recommends that delays be no more than 125 milliseconds.


We have somewhat stricter requirements than the ITU-T, for we recommend a maximum latency of 100 milliseconds. The reason: with a lower latency threshold value, you can be notified in due time and intervene before your coworkers notice that something is awry.

Put an end to choppy connections - once and for all

Network latency: Test vs. monitoring


One-time latency tests

A simple ping query is all it takes to obtain a one-time calculation of latency. Latency (or the ping time) is equal to the amount of time the query needs to reach its target device. You can also enter a traceroute command into the command line to determine the number of hops. These tests provide for individual measurements. Although they are useful for identifying specific problems, they are not at all suitable for comparisons, analyses, or monitoring. 

Perpetual latency monitoring

PRTG keeps a constant eye on all your QoS parameters. Latency, packet loss, jitter, and the Mean Opinion Score are monitored around the clock. If something goes wrong, you’ll be notified at once. The latency monitoring tool PRTG simultaneously monitors your servers, routers, and switches so you can immediately recognize the causes of latency issues or other network problems. What’s more, PRTG lets you create reports and gives you the opportunity to compare data over long periods of time.


Improve network performance with PRTG

Powerful network monitoring

Powerful network monitoring

With preconfigured sensors, PRTG makes it quick and easy to set up your network monitoring – including QoS monitoring and the crucial parameters that go with it. During installation, PRTG runs its Auto Discovery feature and automatically creates sensors within your IP range.

Unambiguous licenses

Unambiguous licenses

With a license, you get access to sensors, the alarm function, and reports. You’ll need around ten sensors per device. Licenses can be upgraded whenever you like. With the trial version of PRTG, you can try all the software’s features for free. The trial version is perfect for getting a feel for PRTG, no strings attached.

Made in Germany

Made in Germany

PRTG is a product of Paessler AG, whose headquarters are located in the city of Nuremberg in the heart of Germany. Paessler AG has been developing monitoring solutions for Windows systems for over 20 years. PRTG is our brainchild, and at the core of our daily work. More than 200,000 system administrators worldwide put their trust in PRTG.

FAQ: Latency and packet processing time


What is network latency?

Latency is a measurement of the time it takes for a data packet to travel from one point to another. This time is referred to as latency, the round-trip time, or the packet processing time.

Why is it important?

By keeping latency spikes to a minimum, you can improve the stability of your network. When latency is too high, problems with VoIP and video conferences are likely to arise. Furthermore, transmission errors can prevent images from loading. Such latency issues are sure to push the capacities of your IT department to the limit.

How do I measure network latency?

Latency can be measured via the command line by running a ping and then recording its time. You can also choose to permanently monitor the latency in your entire network. Read more about testing vs. monitoring latency.

What is WAN latency?

Data packets need a certain amount of time to travel from one device to another. This is also true for packets in distributed networks such as a WAN. If a WAN is overloaded, then delays or disruptions may arise. An overloaded WAN can also have a negative impact on the corresponding LAN. Learn more about how to set up WAN monitoring with PRTG.

Trusted by 200.000 users and recognized by industry analysts as a leader

  • 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

6 tips for smaller companies to optimize latency

Monitor your routers and switches

Monitor your routers and switches

All it takes is one faulty switch or router for latency to rise. Keep a constant eye on your hardware, especially the most important hubs. By doing so, you'll spend much less time getting to the root of a latency spike or some other network problem.

Exploit the advantages of your LAN

Exploit the advantages of your LAN

Many companies use VoIP or video software such as Skype. At the same time, more and more people are working on laptops. Advise your coworkers to use the LAN (instead of the WLAN) for their video conferences.

Check your Internet connection

Check your Internet connection

Which technology does your company use to access the Internet? If possible, switch to LTE, VDSL, or a fiber optic connection. Internet providers are always offering attractive new deals.  Take full advantage to optimize the latency and round-trip times of your data.

Upgrade your hardware

Upgrade your hardware

Every company has outdated hardware that slows the network down. PRTG will immediately point out these weaknesses. PRTG lets you create easy-to-understand charts and reports that are perfect for convincing higher-ups of the urgency of the situation. Looking to go with Cisco, Juniper, or HP? Every manufacturer has its own advantages. Latency in switches and routers is one important factor which can help you decide. Compare the various product series with one another. By the way: PRTG comes with several preconfigured sensors for all the best-known manufacturers.

Optimize routing

Optimize routing

The network latency test tool PRTG counts and monitors the hops that data packets need to travel from one computer to another. You can also perform a traceroute on a specific device with a click of the mouse. Optimize your routing to allow data packets to travel across fewer routers and switches.

Prioritize individual applications

Prioritize individual applications

If certain applications are more important to your company than others (or are used on an extremely regular basis), then it might make sense to prioritize them. For example: it often makes no difference if emails take a few more seconds to arrive. You can therefore give the “right of way” to the data of other applications.

Practical tip: “Hey Konstantin, what can I do with the PRTG QoS Reflector?”

“When using our QoS Roundtrip Sensor, you usually need to place a remote probe on a second Windows computer to measure the round-trip values of data packets. With the PRTG QoS Reflector, this is no longer necessary. The Reflector is a Python script that sends data packets from an endpoint back to PRTG. The QoS Reflector runs on all Linux systems, even a small Raspberry Pi. With PRTG, keeping a constant eye on network latency has never been easier.”

Konstantin Wolff, Software Developer at Paessler AG

Definitions: Packet delay vs. packet loss

Packet delay

Packet delay

If latency spikes, then data packets are likely to be delayed. They are transmitted more slowly and therefore need longer to reach their destination. PRTG measures the processing time of data packets automatically.

Packet loss

Packet loss

Packet loss can quickly lead to complaints and IT service requests. This is usually due to the dramatic drop in the quality of VoIP or video calls. With packet loss, packets get lost on the way to their destination. 

Keep a constant eye on your network
– even while 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!



Want to read more? Be our guest!
Learn more about network monitoring here

Router monitoring

PRTG monitors the bandwidth usage, network activities, and error messages of your routers. It therefore helps you prevent downtime and overloads. Effective router monitoring is the basis for comprehensive network monitoring.

Switch monitoring

There are many different switch manufacturers. With PRTG, you get a tool that works with all the most popular providers. Several preconfigured sensors allow you to quickly set up your switch monitoring. And thanks to SNMP, packet sniffing, and various other sensors, PRTG also lets you keep a close eye on your data traffic.

Remote monitoring

Many companies have international offices in addition to a central IT base. PRTG provides for agentless remote monitoring. All information is consolidated on an easy-to-read dashboard, allowing you to monitor your distributed network around the clock.

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

Markus Puke, Network Administrator, Schüchtermann Klinik, Germany

PRTG is worth it: You’ll optimize your entire IT!

The costs for a one-year PRTG license usually pay for themselves within a few weeks.

PRTG improves the reliability of your network

PRTG improves the reliability of your network

PRTG saves network management costs

PRTG saves network management costs

PRTG saves time spent on network management

PRTG saves time spent on network management

Want to learn more about network monitoring with PRTG?

Here are some topics to help you get started...

Network Traffic Analyzer

Network Activity Monitoring Tool

Network Speed Monitor

Network Discovery Tool

Network Utility Monitor

Network Optimization Tool

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

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

German quality engineering




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, PRTG User Manual, videos, webinars, 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.



Network Monitoring Software - Version (January 22nd, 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