this is technically doable via API, but would very likely need some scripting.
You can have a look at what information is available via API:
1. Log into admin GUI
2. Access these URLs:
-> gives you all DHCP servers, which include a subsection 'reserved-address', essentially the same as 'config system dhcp server/show'
-> all DHCP and DHCP6 leases, with a 'reserved' boolean attribute (is this a reserved IP or not)
-> you can filter for reserved entries:
-> all detected devices
-> includes information on "last seen" (in epoch time, https://www.epochconverter.com/)
-> you can filter for online status:
-> depending on firmware version, the query would be
If that provides an easier format to work with and/or you are comfortable with scripting, API might be the way for you to get the information into a text file and compare
+++ Divide by Cucumber Error. Please Reinstall Universe and Reboot +++