Just a comment about why this program may be useful: The Media Access Control (MAC) address is a unique identifier assigned by manufacturers to the network card in a computer. As opposed to an IP address, which is a software address, the MAC is a hardware address. Its format is two sets of three octets, with the first set identifying the manufacturer.
The MAC address is included in network packets, so even if you change your IP address via VPN, your MAC address stays the same. It could potentially identify your computer despite attempts to mask its identity. For a good explanation, read
https://whatismyipaddress.com/mac-address