Asset Columns
On the Assets tab in Explore, you can view the assets in your environment. The Assets tab has the following columns, which you can show or hide by clicking 
Columns at the top of the table.
| Column Field | Description |
|---|---|
| ACR |
(Requires Tenable Security Center+ license) The Tenable-defined Asset Criticality Rating (ACR) as an integer from 1 to 10. For more information, see Asset Criticality Rating in the Tenable Vulnerability Management User Guide. |
| AES |
(Requires Tenable Security Center+ license) The Tenable-defined Asset Exposure Score (AES) as an integer from 0 to 1000. For more information, see Asset Exposure Score in the Tenable Vulnerability Management User Guide. |
|
DNS Name |
The fully qualified domain name of the asset host. When processing fully qualified domain names (FQDNs) for host assets, Tenable Security Center Director normalizes all FQDNs to lowercase and then merges any duplicates. |
| MAC Address |
A MAC address that a scan has associated with the asset record. |
| NetBIOS | The asset's NetBIOS name. |
| Host ID | The UUID assigned to the asset by Tenable. |
| Tenable ID |
The UUID of the asset in Tenable Security Center Director. |
| Operating System | The operating system installed on the asset. |
| Repository | The repository associated with the asset. |
| System Type | The system type associated with the asset. |
| Last Seen |
The date and time at which the asset was last observed as part of a scan. |
| Source |
The type of scan that identified the asset. |