All the devices associated with each Device Server (managed by) can be viewed from the Devices option. From this view, you can unmanage devices that are in an unclassified state, permanently remove unmanaged devices, reassign device servers, and locate devices in their networks.

Devices live in one of three states; Managed (associated with networks), Unclassified (not in any networks, but kept as objects, or Unmanaged (discovered, but unimportant).