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Technical resources about Network Discovery.
An IP address is a starting clue, not a complete device identity. Correlate Linux routing and neighbour data with DNS, DHCP or cloud inventory, then use the smallest authorized Nmap probe that answers the remaining question.
Use mdns-scan for a quick inventory of DNS-SD service types, then use Avahi to resolve actual instances, hosts, ports, and TXT metadata. This guide also explains the multicast boundary and why discovery commonly fails across Wi-Fi isolation, VLANs, containers, and firewalls.