Manage your OT device inventory from a sensor console

Use the Device inventory page from a sensor console to manage all OT and IT devices detected by that console. Identify new devices detected, devices that might need troubleshooting, and more.

For more information, see What is a Defender for IoT committed device?


Alternately, view your device inventory from a the Azure portal, or from an on-premises management console.

View the device inventory

This procedure describes how to view detected devices in the Device inventory page in an OT sensor console.

  1. Sign-in to your OT sensor console, and then select Device inventory.

    Screenshot of the sensor console's Device inventory page.

    Use any of the following options to modify or filter the devices shown:

    Option Steps
    Sort devices Select a column header to sort the devices by that column.
    Filter devices shown Select Add filter to filter the devices shown.

    In the Add filter box, define your filter by column name, operator, and filter value. Select Apply to apply your filter.

    You can apply multiple filters at the same time. Search results and filters aren't saved when you refresh the Device inventory page.
    Save a filter To save the current set of filters:

    1. Select +Save Filter.
    2. In the Create New Device Inventory Filter pane on the right, enter a name for your filter, and then select Submit.

    Saved filters are also saved as Device map groups, and provides extra granularity when viewing network devices on the Device map page.
    Load a saved filter If you have predefined filters saved, load them by selecting the show side pane button, and then select the filter you want to load.
    Modify columns shown Select Edit Columns . In the Edit columns pane:

    - Select Add Column to add new columns to the grid
    - Drag and drop fields to change the columns order.
    - To remove a column, select the Delete icon to the right.
    - To reset the columns to their default settings, select Reset .

    Select Save to save any changes made.
  2. Select a device row to view more details about that device. Initial details are shown in a pane on the right, where you can also select View full details to drill down more.

    For example:

    Screenshot of the Device inventory page on an OT sensor console.

For more information, see Device inventory column reference.

Edit device details

As you manage your network devices, you may need to update their details. For example, you may want to modify security value as assets change, or personalize the inventory to better identify devices, or if a device was classified incorrectly.

If you're working with a cloud-connected sensor, any edits you make in the sensor console are updated in the Azure portal.

To edit device details:

  1. Select one or more devices in the grid, and then select View full details in the pane on the right.

  2. In the device details page, select Edit Properties.

  3. In the Edit pane on the right, modify the device fields as needed, and then select Save when you're done.

Editable fields include:

  • Authorized status
  • Device name
  • Device type
  • OS
  • Purdue layer
  • Description

For more information, see Device inventory column reference.

Export the device inventory to CSV

Export your device inventory to a CSV file to manage or share data outside of the OT sensor.

To export device inventory data, on the Device inventory page, select Export .

The device inventory is exported with any filters currently applied, and you can save the file locally.

Merge devices

You may need to merge duplicate devices if the sensor has discovered separate network entities that are associated with a single, unique device.

Examples of this scenario might include a PLC with four network cards, a laptop with both WiFi and a physical network card, or a single workstation with multiple network cards.


  • You can only merge authorized devices.
  • Device merges are irreversible. If you merge devices incorrectly, you'll have to delete the merged device and wait for the sensor to rediscover both devices.
  • Alternately, merge devices from the Device map page. When merging, you instruct the sensor to combine the device properties of two devices into one. When you do this, the Device Properties window and sensor reports will be updated with the new device property details.

For example, if you merge two devices, each with an IP address, both IP addresses will appear as separate interfaces in the Device Properties window.

To merge devices from the device inventory:

  1. Use the SHIFT key to select two devices from the inventory, and then right-click one of them.

  2. Select Merge to merge the devices. This can take up to 2 minutes to complete.

  3. When the Set merge device attributes dialog appears, enter a meaningful name for your merged device, and then select Save.

View inactive devices

You may want to view devices in your network that have been inactive and delete them.

For example, devices may become inactive because of misconfigured SPAN ports, changes in network coverage, or by unplugging them from the network

To view inactive devices, filter the device inventory to display devices that have been inactive.

On the Device inventory page:

  1. Select Add filter.
  2. Select Last Activity in the column field.
  3. Choose the time period in the Filter field. Filtering options include seven days or more, 14 days or more, 30 days or more, or 90 days or more.


We recommend that you delete inactive devices to display a more accurate representation of current network activity, better evaluate committed devices, and reduce clutter on your screen.

Delete devices

You may want to delete devices from your device inventory, such as if they've been merged incorrectly, or are inactive.

Deleted devices are removed from the Device map and the device inventories on the Azure portal and on-premises management console, and aren't calculated when generating reports, such as Data Mining, Risk Assessment, or Attack Vector reports.

To delete a single device:

You can delete a single device when they’ve been inactive for more than 10 minutes.

  1. In the Device inventory page, select the device you want to delete, and then select Delete in the toolbar at the top of the page.
  2. At the prompt, select Yes to confirm that you want to delete the device from Defender for IoT.

To delete all inactive devices

This procedure is supported for the cyberx and admin users only.

  1. Select the Last Activity filter icon in the Inventory.
  2. Select a filter option.
  3. Select Apply.
  4. Select Delete Inactive Devices. In the prompt displayed, enter the reason you're deleting the devices, and then select Delete.

All devices detected within the range of the filter will be deleted. If you delete a large number of devices, the delete process may take a few minutes.

Export device inventory information

You can export device inventory information to a .csv file.

To export:

  • Select Export file from the Device Inventory page. The report is generated and downloaded.

Device inventory column reference

The following table describes the device properties shown in the Device inventory page on a sensor console.

Name Description
Description A description of the device
Discovered When this device was first seen in the network.
Firmware version The device's firmware, if detected.
FQDN The device's FQDN value
FQDN lookup time The device's FQDN lookup time
Groups The groups that this device participates in.
IP Address The IP address of the device.
Is Authorized The authorization status defined by the user:
- True: The device has been authorized.
- False: The device hasn't been
Is Known as Scanner Defined as a network scanning device by the user.
Is Programming device Defined as an authorized programming device by the user.
- True: The device performs programming activities for PLCs, RTUs, and controllers, which are relevant to engineering stations.
- False: The device isn't a programming device.
Last Activity The last activity that the device performed.
MAC Address The MAC address of the device.
Name The name of the device as the sensor discovered it, or as entered by the user.
Operating System The OS of the device, if detected.
PLC mode (preview) The PLC operating mode that includes the Key state (physical, or logical), and the Run state (logical). Possible Key states include, Run, Program, Remote, Stop, Invalid, and Programming Disabled. Possible Run states are Run, Program, Stop, Paused, Exception, Halted, Trapped, Idle, or Offline. If both states are the same, then only one state is presented.
Protocols The protocols that the device uses.
Type The type of device as determined by the sensor, or as entered by the user.
Unacknowledged Alerts The number of unacknowledged alerts associated with this device.
Vendor The name of the device's vendor, as defined in the MAC address.
VLAN The VLAN of the device. For more information, see Define VLAN names.

Next steps

For more information, see: