If you know a particular starting point for discovering the network, the information can be entered at Settings → Discovery Seed. This option does not exclude any networks from discovery (for this option see step 4 - Include or Exclude networks in Discovery).
The starting points can be management IP addresses or networks, or existing inventory data can also be imported.
If no seed information is entered, the discovery will begin from the current default gateway. The system will try to trace RFC6890 subnets (by default) to determine the immediate next hops to log in to.