nmap is a powerfull tool, which is known to be a port scanner. But there are other useful situations where it can be used:

  1. Query dhcp parameters
    sudo nmap -sU -p 67 --script=dhcp-discover 192.168.178.1
  2. Query registered DNS names in a fritz box
    sudo nmap -sP -PN -R --dns-servers 192.168.178.1 192.168.178.0/24 | grep -i fritz.box
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