My Wife noticed some unusual web behavior and  I found an unknown device on my netwwork.  I assume someone hacked into my network and I just rebooted the router without recording the MAC address.  I would like to capture a report showing every device currently connected to my network showing Hostname, ip address and the Mac Address once every hour or so.  How can I do this?

I am running linux and have access to wget and curl, so if I could download the html file and scrape it that would be ok.  So far that hasn't worked.

Terry