Get IPs of all RaspberryPis on an IP range

findLocalRaspis.sh

#!/usr/bin/env bash
set -euo pipefail;

IP_RANGE=${1-};

if [[ -z "${IP_RANGE}" ]]; then
	echo "Must specify network range to scan, e.g. 192.168.2.0/24";
	exit 1;
fi

RASPI_OUI="B8:27:EB";

IP_REGEX="\b(\d{1,3}\.){3}\d{1,3}\b";

###
# Nmap will output like this:
#
# ```
# Nmap scan report for 192.168.2.100
# Host is up (0.099s latency).
# MAC Address: B8:27:EB:XX:XX:XX (Raspberry Pi Foundation)
# ```
#
# NB: Nmap MUST be run as root for MAC addresses to be shown.
###

sudo nmap -sP -n ${IP_RANGE} \
| grep -B2 "${RASPI_OUI}" \
| grep -Eo "${IP_REGEX}";