Paessler PRTG

Monitor availability with PRTG and enjoy up to 99.999% uptime

  • Benefit from 24/7 monitoring of your entire IT infrastructure
  • High availability monitoring of servers, website, network, email & more
  • Customized alerts help you take action to prevent crashes

Our users give top ratings for monitoring with Paessler PRTG



PRTG makes monitoring availability easy

Custom alerts and data visualization make it easy to monitor, identify, and prevent network availability issues.









Availability monitoring for every use case, included with PRTG

The email server is down, the telephone won't stop ringing. Everyone is calling, although the downtime has lasted for six minutes only. But the stress and short-term work loss are immense. Calculated over the course of a year, this costs a huge amount of money. That's where Paessler PRTG comes in: our monitoring software paves the way to high availability.

Website availability

Every system failure means lost sales and customer complaints. PRTG includes the Ping v2 sensor to help you avoid crashes and ensure your website is always accessible.

Plus, the Cloud Ping v2 and Cloud HTTP v2 sensors monitor the availability of your website from a number of different locations around the globe.

Email availability

If your mail server is down, the backbone of your communication is broken. PRTG comes with POP3, IMAP, and SMTP sensors to monitor the availability of your mail server.

To check whether emails are delivered and how long they need to arrive at their destination, you can use our two email round trip sensors.

Server availability

No matter if you want to keep an eye on the availability of your hardware (database servers, file servers, storage servers,…) or your virtual servers, PRTG has got you covered.

With the Ping v2 sensor as the central availability checker, you can even reduce alert noise – as soon as a server is not reachable anymore, PRTG sends an alert and automatically pauses all other sensors in the dependency.

Bandwidth availability

PRTG is the perfect tool for SLA monitoring, for example, if you want to know if your service provider is actually delivering the amount of bandwidth that was promised.

In fact, PRTG includes sensors for almost every available technology for monitoring bandwidth usage, for example SNMP, packet sniffing, and flow (NetFlow, jFlow, sFlow, and IPFIX).


Network availability

With PRTG, you'll enjoy a 24/7 overview of your entire network. Monitor the availability of all systems, devices, applications, and services – on-premises, in the cloud, or in virtualized environments.

We even throw in a failover cluster to ensure the availability of your monitoring in the event of a PRTG server crash.








What availability monitoring looks like in PRTG

Diagnose network issues by continuously monitoring the availability of your servers, applications, website, services, and more. Show the reachability all your network’s components in real time and visualize data in graphic maps & dashboards to identify problems more easily. Gain the visibility you need to troubleshoot costly downtime.


Save time & money with up to 99.999% availability with PRTG

What’s the difference between 99% availability and 99.999% availability?

  • Over 87 hours of downtime
  • Many headaches, wasted time, and lost productivity
  • Up to €640,000 or $700,000 in costs and lost revenue*


With PRTG, many customers reduce downtime to 5 minutes or less per year with 99.999% availability of their website, servers, and databases. Here’s a breakdown of the potential impact of PRTG on your business:

  • 99% availability = 87.7 hours of downtime per year
  • 9% availability = 8.45 hours of downtime per year
  • 99% availability = 52 minutes of downtime per year
  • 999% availability = 5 minutes or less of downtime per year


*According to a study by Techconsult, one hour of downtime costs medium-sized companies between €20,000 and €40,000, or between $21,000 and $42,000. The companies in the study had an average of four crashes per year, with each crash lasting an average of 3.8 hours. The total costs therefore amount to €320,000 to €640,000 per year (up to $700,000) for medium-sized companies with 200 to 5,000 employees.



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”


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


5 reasons to choose PRTG as your network availability monitoring tool


With PRTG, you get a centralized monitoring solution that covers your entire IT infrastructure. With one single dashboard, you can monitor your entire network, as well as all end devices. PRTG simplifies your day-to-day work, and its configuration and setup are quick and easy.

Custom alerts & notifications

PRTG comes with a customizable, built-in notification system. When problems arise, you’ll immediately be alerted via email, SMS, push notification, or other methods so you can take action before the performance of your system is affected.

Comprehensive reporting

PRTG features a customizable and comprehensive reporting system which gives you a reliable data base for your long-term planning. With PRTG, you’ll shed light on the causes and consequences of failures and document the load of your network.

Customizable visualization

PRTG not only displays your entire monitoring setup on an easy-to-read dashboard, but also offers the possibility to create custom network maps and dashboards using our drag-and-drop widget editor. This way, you can quickly visualize the availability of your systems the way you need.

Network performance & security

Along with hardware, PRTG also monitors your available bandwidth and network traffic so you can keep a constant eye on the performance of your network. While PRTG is not a security tool, you can also monitor open and closed ports to help recognize suspicious traffic and improve security.


Your network availability monitor 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



Watch our 5-minute video:
How to monitor availability with PRTG


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

vendors applications blue


Easily find the source of the problem with our PRTG availability monitoring solution

Real-time alerts and custom notifications make it easy to solve issues with costly downtime.



Create innovative solutions with Paessler’s partners

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

IP Fabric

Combining the broad monitoring feature set of PRTG with IP Fabric’s automated network assurance creates a new level of network visibility and reliability.

Read more


Siemon and Paessler bring together intelligent building technology and advanced monitoring and make your vision of intelligent buildings and data centers become reality.

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



“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 


PRTG makes monitoring availability easy

Custom alerts and data visualization make it easy to monitor, identify, and prevent network availability issues.


Monitoring availability: FAQ


What is availability monitoring?

Availability monitoring is the process of continuously observing and measuring the uptime and performance of a system, network, or service to ensure it remains accessible to users. This involves tracking metrics such as response times, downtime occurrences, and overall reliability. Availability monitoring plays a crucial role in maintaining service level agreements (SLAs) and meeting customer expectations for reliable access to digital resources.

Why is availability monitoring important?

Availability monitoring is important for several reasons:

  • Maximize uptime: It ensures that systems and services remain accessible to users without significant interruptions, which maximizes their availability and minimizes downtime.
  • Meet SLAs: Many organizations have service level agreements with customers or stakeholders that specify minimum levels of uptime and performance. Availability monitoring helps ensure these agreements are met or exceeded.
  • Identify and troubleshoot issues: By continuously monitoring availability metrics, organizations can quickly identify and resolve any issues or potential bottlenecks that may impact accessibility or performance.
  • Optimize user experience: Consistent availability and reliability contribute to a positive user experience. Monitoring helps maintain high levels of accessibility, which in turn leads to greater user satisfaction and loyalty.
  • Enhance business continuity: Availability monitoring is a key component of overall business continuity and resilience strategies. It helps organizations anticipate and mitigate potential disruptions, ensuring critical services remain operational even in the face of unforeseen events or challenges.

Can PRTG monitor more than availability?

Yes. Paessler PRTG is proprietary monitoring software that can monitor your entire IT infrastructure including network traffic, applications, bandwidth, cloud services, databases, virtual environments, availability & uptime, ports, IP addresses, hardware status, network security, web services, and much more.

How do I configure a high-availability cluster in PRTG?

With PRTG, setting up a simple failover cluster is quick and easy. Configure one PRTG server on two different computers, each with the same license key. Decide which of your PRTG servers is to be the master node in the cluster, and follow the steps in our how-to guide.

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


More than just a monitoring tool:
Reasons our customers love 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 network availability monitoring 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


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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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