Sniff machine names from a local or remotely connected network without additional installs

sniff-linux.sh

#!/bin/bash

for a in $(arp -n | tail -n+2 | cut -d' ' -f1); 
do 
  nmblookup -A $a;
done

sniff-mac.sh

#!/bin/bash

# Helpful - `dns-sd -B _smb._tcp`
for a in $(arp -al | tail -n+2 | cut -d' ' -f1); 
do 
  smbutil lookup $a;
done