All Raspberry PI devices use MAC address staring with B8:27:EB (Raspberry PI 4B uses dc:a6:32 although) so you can use the following commands to identity your Raspberry PI’s on your local network:
For Windows computers :
arp -a | findstr b8-27-eb
Or when you are using MacOS or Linux :
arp -na | grep -i b8:27:eb
Example (found 2 Raspberry PI’s on Windows PC) :
