<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: Port Range Sensor

The Port Range sensor monitors a network service by connecting to various TCP/IP ports. It tries to connect to the specified TCP/IP port numbers of a device in succession and waits for the device to accept each request.

i_round_blueOptionally, you can set limits in the channel settings. This way, you can get alerts about open and closed ports.

Port Range Sensor

Port Range Sensor

i_square_cyanFor a detailed list and descriptions of the channels that this sensor can show, see section Channel List.

Sensor in Other Languages

  • Dutch: Poortbereik
  • French: Plage de port
  • German: Portbereich
  • Japanese: ポート範囲
  • Portuguese: Intervalo de portas
  • Russian: Диапазон портов
  • Simplified Chinese: 端口范围
  • Spanish: Rango de puerto


Consider the following remarks and requirements for this sensor:



SRP ciphers

  • This sensor does not support Secure Remote Password (SRP) ciphers.


  • This sensor supports IPv6.

Performance impact

  • This sensor has a very low performance impact.

Hosted probe

i_podYou cannot add this sensor to the hosted probe of a PRTG Hosted Monitor instance. If you want to use this sensor, add it to a remote probe device.

Basic Sensor Settings

Basic Sensor Settings

Basic Sensor Settings

The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:

  • portrangesensor

i_square_cyanFor more information about basic sensor settings, see section Sensor Settings.

Port Range Specific

Port Range Specific

Port Range Specific



Timeout (Sec.)

Enter a timeout in seconds for the request. Enter an integer. The maximum timeout value is 900 seconds (15 minutes).

i_round_blueIf the reply takes longer than this value, the sensor cancels the request and shows a corresponding error message.

Port-by-Port Delay (ms)

Define how long the sensor waits in milliseconds (ms) to go to the next port while it runs through all specified ports.

Port Range Selection Method

Define whether you want to monitor all ports within a range or if you want to monitor several individual ports:

  • Port range: Monitor ports within a range.
  • List of ports: Monitor several individual ports.

Range Start

This setting is only visible if you select Port range above.

Enter the port number where the scan starts. Enter an integer.

Range End

This setting is only visible if you select Port range above.

Enter the port number where the scan ends. Enter an integer.

Port List

This setting is only visible if you select List of ports above.

Enter the numbers of the ports that the sensor tries to connect to. Enter one or more individual integers. Enter each port in one line.

If Value Changes

Define what the sensor does if the number of closed ports or open ports changes:

  • Ignore (default): Do nothing.
  • Trigger 'change' notification: Send an internal message that indicates a change.
    i_round_blueIn combination with a change trigger, you can use this to trigger a notification if a change occurs.

Sensor Display

Sensor Display

Sensor Display



Primary Channel

Select a channel from the list to define it as the primary channel. In the device tree, PRTG displays the last value of the primary channel below the sensor's name. The available options depend on what channels are available for this sensor.

i_round_blueYou can set a different primary channel later by clicking b_channel_primary below a channel gauge on the sensor's Overview tab.

Graph Type

Define how this sensor shows different channels:

  • Show channels independently (default): Show a graph for each channel.
  • Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic.
    i_round_redYou cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).

Stack Unit

This setting is only visible if you select Stack channels on top of each other above.

Select a unit from the list. PRTG stacks all channels with this unit on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so.

Inherited Settings

By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click b_inherited_enabled under the corresponding setting name to disable the inheritance and to display its options.

i_square_cyanFor more information, see section Inheritance of Settings.

Channel List

i_round_blueWhich channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.




The time until requests to ports are accepted

i_round_blueThis channel is the primary channel by default.

Closed Ports

The number of closed ports


In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status

Open Ports

The number of open ports


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