I found “hosts” via assets->IP-addresses that are not unique identified via MAC, because they are only seen on layer 3 and not layer 2. For those DHCP responses should also identify a host and assign the IP-address to this hostname. But why don’t you support RDNS lookup in general/ for other hosts? We cover many only in layer 3 mode.
We monitor DNS traffic and correlate hostnames accordingly. There’s generally no need for reverse DNS.