All-in-one uptime monitoring
with PRTG Network Monitor

  • Check the uptime of all your servers: FTP server, mail server, DNS server, SQL server, virtual servers
  • PRTG monitors your website availability
  • Determine causes of crashes
  • PRTG offers a comprehensive report system including statistics, charts, and much more  


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

Uptime in IT networks

The term "uptime" is used in IT to define the period of time in which a computer system is functional and available. When referring to a network, uptime is defined in terms of the availability and reliability of servers and devices, or by domain and website availability. Most of the time, availability is displayed as a percentage. An availability of 90% measured over the course of a day means the system was functional and available for exactly 1296 minutes (21.6 hours) on that particular day.

Ensure a working IT environment with uptime monitoring

The goal of uptime monitoring with PRTG is to guarantee smooth running of all your services. Whether it be your hardware devices, your servers, your CDN or your websites - you can keep an eye on the availability of your entire IT environment.

If any of your monitored services goes down, you get an instant alarm per email, SMS or push notification. This gives you the possibility to react before things get worse. Of course, your goal should be to get as close to 100 % uptime as possible. PRTG provides detailed statistics about network uptime and the availability of individual services.

Uptime monitoring:
Why PRTG is the right choice









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.)

Cost-free start up

Cost-free start up

There is a free trial version of PRTG. Take our network monitoring tool for a trial run and find out how you can use it monitor your uptime to prevent costly downtime.

One-stop monitoring

One-stop monitoring

Many companies monitor using a number of disparate solutions. Couple this with all of the other in-house IT duties and you have a recipe for confusion and at times, disaster. But with PRTG, you get one central, comprehensive monitoring tool for ALL of your monitoring. PRTG is simple to set up, requires little bandwidth, and makes your day-to-day work easier.

Get straight to the causes

Get straight to the causes

With PRTG, you'll enjoy an exhaustive view of your entire IT infrastructure. It not only keeps track of your uptime and downtime, but can also determine the causes of crashes. What is really behind the crash? The hardware, network connection, or a faulty configuration? Thanks to PRTG, you'll save time when troubleshooting.

Prompt notifications

Prompt notifications

A customizable notification system quickly sends off an alert by Email, SMS, or push notification so you can fix bugs before more serious problems arise. Don't wait to put out the fire, stop the fire starting!

Detailed reports

Detailed reports

PRTG boasts an exhaustive report system with statistics, charts, and much more. Create customized reports and have them sent to your superiors automatically. Use these reports to see how and where you are saving resources.

Perfectly compatible

Perfectly compatible

PRTG offers monitoring sensors - predefined measuring points - for practically every major device manufacturer, including Cisco, Dell, Oracle, and HP.

Perfectly compatible

Public status pages

PRTG also allows you to automatically communicate outages of your website or services. Read here how to connect PRTG to and how to transmit information to a status page in the event of an IT system failure in real time.

Greater predictabilty

Greater predictability

Monitoring with PRTG allows you to take total control. Take advantage of a reliable database to optimize load distribution. Or plan the expansion of your network.


Your goal:?
Use PRTG to near 100% uptime!

When it comes to uptime, only one percentage will do:?99.999! These "5 nines" are the badge of your network's high level of availability. PRTG can help you reach this ambitious goal. On this page, you'll discover the advantages of uptime monitoring with PRTG, the sensors we provide, and a few of our tips on network monitoring!?


A quick glimpse into PRTG: uptime monitoring

Measuring uptime:
? keep an eye on everything

Uptime of your servers

With PRTG, you can check the uptime of all your servers. Whether a FTP server, mail server, web server like IIS, DNS server, SQL server, or virtual servers such as VMware or Hyper-V, PRTG keeps track of everything. CPU load, memory, bandwidth, and many other parameters of your server performance are monitored by default. For more information, see our page on the availability of your servers.

Uptime of devices

When coworkers complain about their devices malfunctioning, many administrators embark upon a time-consuming search for the culprit. Is the bug in the network or in the user's device? With PRTG, you can check the functions of each individual device - whether it be a desktop computer, router, switch, or another network component. For more information, visit our page on hardware monitoring with PRTG.?


Uptime of your websites

For many companies, website availability is an important factor in their sales performance. Every second a company is offline is a second when customers are unable to browse products or place orders. With PRTG, you'll not only monitor availability, speed, and database performance, but also the individual content of your website. When it comes to domain availability, the issues are often the same. With PRTG, website monitoring is easy.


“The support we received from Paessler AG was extremely reassuring. Their reaction time, know-how, and solutions were outstanding in every department.”

Andreas Reimann, Senior Networking Communication Architect at Zürich Airport. Zürich Airport uses more than 4,500 sensors for its monitoring


Trusted by 200.000 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


  • 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

PRTG simplifies your day

Our network monitoring software immediately lets you know if there are issues with your uptime.
PRTG lets you concentrate on your day-to-day tasks with peace of mind.


PRTG saves time

With PRTG, you get one central monitoring tool for checking the uptime and downtime of your network. Our dashboard provides a quick overview at all times - whether on your desktop or as an app.


PRTG saves stress

Setting up PRTG is quick and easy. There are numerous sensors available for your uptime monitoring. With 200+ predefined sensors, you'll have no trouble detecting the causes of your downtime.


PRTG saves money

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

Your uptime 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!


Perfect sensors
for uptime monitoring


i Ping is a command-line utility, available on virtually any operating system with network connectivity, that acts as a test to see if a networked device is reachable. The ping command sends a request over the network to a specific device. A successful ping results in a response from the computer that was pinged back to the originating computer.
Read more


Ping Sensor: The easiest way to check the uptime or availability of your network or your website is by using a Ping sensor. Find out more about the Ping sensor in the PRTG manual.

SNMP System Uptime Sensor: This predefined sensor will enable you to monitor uptime via SNMP and see how long a device has been running without interruption. SNMP uses little bandwidth and CPU and is therefore an ideal monitoring solution. Read more about the SNMP System Uptime Sensor.

Windows System Uptime Sensor: With this sensor, you can monitor uptime via Windows Performance Counters or WMI (Windows Management Instrumentation) and see how long a Windows-based computer has been running without interruption. For more information, check out the Windows System Uptime Sensor. While this sensor is well-suited for Windows devices, it tends to have a greater effect on your system's performance than SNMP.

Other sensors: Our PRTG sensor list contains more than 200 predefined sensors. Sensors for servers, bandwidth, applications...the selection is vast and constantly being updated by the PAESSLER team.

Use our Smart Setup! PRTG automatically begins creating sensors right from the time it is being configured. By pinging a private IP range, PRTG lets you get started with uptime monitoring simply by opening the monitoring tool for the first time.



Also interesting:


Packet Sniffing: PRTG analyzes data packets and displays the data packet loss rate. In the event a critical value is exceeded, you’ll automatically receive an alert.

Printer Monitoring: With PRTG you know the status of every printer. See detailed printer error messages at a glance and get informed if printer replacement is necessary.

Fortinet Monitoring: Check the status of your Fortinet products and get alerts as soon as your Fortinet solution 
identifies a security risk.

Website Monitoring: Is your website available? Are all its key processes operational? Are its load times increasing? With PRTG, you can monitor the status of your website from different locations with the HTTP and Cloud HTTP sensors. The same goes for your servers and entire IT infrastructure.

Quote Arne Seifert

Practical tip: “Hey Arne, what would you tell administrators looking to use PRTG to monitor the uptime of their networks?”

“For sensor lists and reports, PRTG immediately sorts between uptime and downtime. Usually, the ping downtime sensor is all you’ll need to get a quick overview of what’s going on. Simply enter “pingsensor” and right away you’ll see where most of the problems in your network lie.”

Arne Seifert works in the Paessler AG support department.?


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.


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.


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


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Supported Vendors & Applications


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