Report on unknown device failures

Hello. We've just migrated to Symantec from McAfee and are in the process of deploying clients, so am quite new to Symantec. I've enabled 2 machines (one on each of our subnets) as Unmanaged Detectors and can view the results under Home > Security Status > Security Status Details > Unknown Device Failures. Ideally what I'd like to do now is produce a report on these devices so I can identify them further and act (resolving the ip address to a name would be nice but even just a list of IPs would do). Can anyone help with any advice on this? Thanks.