A network discovery job was performed.

Network Discovery is an automated process to scan subnets and import new infrastructure. However, the discovery engine includes logic to prevent duplicate entries and ignore non-relevant assets. According to theSolarWinds Platform Administrator Guide, if specific devices are missing from the results, the most common administrative cause is theDiscovery Ignore List.

The "Ignore List" is a database of IP addresses or MAC addresses that the platform has been explicitly told to skip. This often happens if a device was previously discovered but the administrator chose "Ignore this node" during the import phase. The system remembers this choice to prevent the device from reappearing in every subsequent scan. Additionally, the platform automatically ignores any node that isalready presentin the "Manage Nodes" list to avoid creating redundant monitoring objects.

While a timeout (Option C) or incorrect polling method (Option D) could cause a node to fail to respond with its full metadata, the device would typically still appear in the discovery results as a "Generic" or "ICMP-only" device rather than being skipped entirely. Only theIgnore Listor pre-existing status causes a device to be excluded from the discovery results table during a scan of a valid subnet.