---
title: "Checking Connected Device Histories"
canonical: "https://docs.infoblox.com/space/netmri760/357140459/Checking%20Connected%20Device%20Histories"
format: markdown
---
For Ethernet switches and L2/L3 switch-routers, NetMRI provides the device management history for the device currently shown in the Device Viewer. The key values are the **First** **Seen** and **Last** **Seen** values, which show the date and time when the device was first discovered and polled by NetMRI and the timestamp for the most recent device polling occurrence.

In rare cases, you may see this option in the Device Viewer for a Firewall. By default, the **Device** **History** table shows eight columns of data, including the following:

- **First** **Seen:** The timestamp for the first occasion where the device was successfully discovered by NetMRI.
- **Last** **Seen:** The timestamp indicating when the device was last polled by NetMRI. If the device is still connected, this field will reflect current timestamp values from the last network polling by the appliance.
- **Device** **Name:** The configured device name.
- **IP** **Address:** The IP address of the device.
- **DNS** **Name:** The DNS name for the device.
- **Description:** The description that was collected for the device.
- **Poll** **Duration:** The period of time in seconds required for the most recent polling cycle for the device. This value may change from poll cycle to poll cycle.

Other fields can be selected for appearance in the table.