Nmap
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Nmap (Network Mapper) [1] is a cross-platform (BSD, Linux, Mac, Windows) utility for network discovery and security auditing.
Backgroud
Nmap is a useful tool to find the IP address of a device (e.g. if the device acquired the IP address via DHCP) or to debug connectivity problems (e.g. to check if a firewall blocks ports).
Network discovery example
In a terminal window type:
nmap -v 192.168.1.*
You can specify a specific IP address to scan a single host or use an asterisk (wildcard character) to scan an entire subnet. The resulting output contains a list of discoverd devices with their hostname, IP address and active network ports.
UDP scan example
sudo nmap -v -sU 192.168.0.1
This command scans the UDP ports of a specific device.