Find Raspberry Pi devices on your local networks.

find-pis

#!/bin/sh

# get broadcast addresses for each network
net=`ifconfig | grep -o -E "Bcast:(.*?) " | cut -f2 -d":"`

# loop over networks running the scan
for n in $net;
do
  # first find SSH machines silently to prime the arp table
  nmap -T4 -n -p 22 --open --min-parallelism 100 "$n/24" | grep -e "scan report for" -e "ssh" > /dev/null
done

# then run arp to show machines pi MACs
# https://udger.com/resources/mac-address-vendor-detail?name=raspberry_pi_foundation
arp -na | grep -E "(b8:27:eb|dc:a6:32)" | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'