Host Discovery with Nmap

Nmap can be used to find all active clients in a network. It can be used in many different ways - this set of arguments works best for a local area network with several PIs.

nmap -sP 10.10.10.1/24

For a network with several PIs connected, the output will look like this:

Starting Nmap 7.94SVN ( https://nmap.org ) at 2024-09-10 10:24 EDT
Nmap scan report for 10.10.10.1
Host is up (0.11s latency).
Nmap scan report for 10.10.10.83
Host is up (0.00011s latency).
Nmap scan report for 10.10.10.101
Host is up (0.055s latency).
Nmap scan report for 10.10.10.102
Host is up (0.055s latency).
Nmap scan report for 10.10.10.103
Host is up (0.055s latency).
Nmap scan report for 10.10.10.104
Host is up (0.0033s latency).
Nmap scan report for 10.10.10.105
Host is up (0.0033s latency).
Nmap scan report for 10.10.10.106
Host is up (0.0032s latency).
Nmap scan report for 10.10.10.107
Host is up (0.0046s latency).
Nmap scan report for 10.10.10.108
Host is up (0.0046s latency).
Nmap scan report for 10.10.10.109
Host is up (0.0046s latency).
Nmap scan report for 10.10.10.112
Host is up (0.049s latency).
Nmap done: 256 IP addresses (12 hosts up) scanned in 30.59 seconds