List IP addresses of running VirtualBox VMs using nmap (works on OSX and Linux)

vbox-ips.sh

#!/bin/bash
networks=$(ifconfig|tr A-Z a-z|grep b[a-z]*st|sed -e "s/.*b[a-z]*st[: ]*//;s/ .*//;s#\$#/24#"|grep [0-9]/24)
netinfo=$(sudo nmap --min-rate 10000 --max-retries 0 --max-rtt-timeout 250ms -T 5 -n -sn $networks|\
	sed -e 's/Nmap scan report for /\$/'|tr '\n' '|'|tr '\$' '\n'|grep MAC|sed -e "s/|.*MAC [A-z]*: */|/;s/ [(].*//")
vboxmanage list runningvms|sed -e 's/[^"]{.*//'|tr -d '"'|grep '[A-z]'|while read name ; do
	macs=$(vboxmanage showvminfo "$name" | grep NIC.*MAC: | awk '{print $4}'  | \
		sed 's/.\{2\}/&:/g' | sed 's/.\{2\}$//'|tr '\n' '|')
	printf '%s\n%s\n' "$name" "$netinfo" | egrep -i "($macs$name)"
done