Can I determine the current IP from a known MAC Address

Question

I have a shell script that wakes up a machine on my local network using etherwake. I'm not sure what the IP address is after the computer is awake.

ip=$(ping -c 1 hostname | head -1 | awk '{print $3}' | sed 's/[()]//g')

Is there a way to get the IP if all I know is the MAC address?

Answer 1

ARP may be used to retrieve an IP address from a known MAC address. But first, you must update your local ARP table in order to get information from all network devices. To ping the whole LAN, send a broadcast message to your network. Type in the Command Prompt in Windows or the Terminal on macOS.