Device Logging Software Suggestions

I have recently discovered an unknown device attached to my home Linksys router. I turned on the logging feature that's in the router's troubleshooting App. I can see that the device is active throughout the day.

Unfortunately the built-in logger doesn't time stamp any of the events, so I don't have a good idea when the activity occurs. So I need better logging software. A definite plus would be if the software can resolve the destination IP address into a domain name.

Thanks!