index.js

"use strict";

const os = require("os");
const ip = require("ip");
const ping = require('ping');
const arp = require("node-arp");

let networks = [];
let myAddress = [];

var interfaces = os.networkInterfaces();
for (let name in interfaces) {
    interfaces[name].map((inet) => {
        if (inet.internal) return;
        if (inet.family != 'IPv4') return;

        myAddress.push(inet.address);
    
        for (let i in networks) {
            if (networks[i].contains(inet.address)) {
                return;
            }
        }

        networks.push(ip.cidrSubnet(inet.cidr))
    });
}

// console.log(networks);

networks.map((network) => {
    for(let i = ip.toLong(network.firstAddress), l = ip.toLong(network.lastAddress); i < l + 1; i++){
        let address = ip.fromLong(i)
        if (myAddress.indexOf(address) != -1) continue;
        // console.log(address);

        ping.sys.probe(address, function(isAlive){
            if (!isAlive) return;

            arp.getMAC(address, (error, mac) => {
                if ( mac.startsWith("b8:27:eb")) {
                    console.log(address);
                }
            });
        }, {timeout: 1});
    }
});