Find machine on network

# all known hosts
arp -a

# find by name (may need to install awahi)
dig +short @224.0.0.251 -p 5353 raspberrypi.local

# brute force (ping all ips in local network)

hostname -I # find network adress, i.e 192.168.1.123

nmap -sn 192.168.1.0/24