---
title: "Checking Basic Device Information"
canonical: "https://docs.infoblox.com/space/netmri754/105944322/Checking%20Basic%20Device%20Information"
format: markdown
---
The Device Viewer's **Device/Network** **Explorer** section (**Device** **Viewer** > **Device/Network** **Explorer**) shows a substantial body of critical information about a selected device relative to other network elements. **Device/Network** **Explorer** conveys many details about the relative location of the device in the network, and aspects of its operating state. The "location" of the device is described by its SNMP identity, with many other pieces of information about the network switch, router, or other entity.

Before device identification, NetMRI verifies SNMP, Telnet, and SSH ports by access to these ports during normal operation. Any device that supports the *tcpConnState* SNMP table and is accessible is polled for additional open TCP ports.

To enable active port scanning, click the** Settings** icon > **Setup** > **Collection** **and** **Groups** > **Global** tab.

To display or hide columns in the table,  click a column header menu, select **Columns** in the drop-down menu, and then select the columns you want to display in the table.

To enter new custom data for the device currently shown in the Device Viewer, complete the following:

1. Click **New**. The **Add new custom field data** dialog appears.
2. Open the **Name** field and select a field by name.
3. Enter a corresponding **Value**.
4. Click **Save & Close**.

To edit custom data, complete the following:

1. Click the **Edit** button for the field.
2. Change the data value.
3. Click the **Save & Close** button.

To delete data, click the **Delete** button, then confirm the deletion.