MacScanner

What does it do?

• with macscanner you can monitor mac-address appearances, leaves and ip address changes
• almost in real-time (depdening on configuration and network size)
• you can only monitor private networks, of which the host running the scanner is a client
• it works by calculating all hosts in the network, pinging them and grabbing the mac-address from an arp table

What does it require?

• will not work on windows (tested on ubuntu only, but mac should work as well)
• requires arp
• requires access to raw sockets, there is a good chance that you need to start the app with elevated rights
• starting with elevated rights can work like this sudo $(which node) index.js
• requires node version >= 8

How to use it?

• install via npm -g mac-scanner
• checkout the example here

"use strict";
const {MacScanner} = require("mac-scanner");
const scanner = new MacScanner(config);
scanner.start();
scanner.on("entered", target => {
    console.log("he is here", target.ip, target.mac);
});
scanner.on("left", target => {
    console.log("he is gone", target.ip, target.mac);
});
scanner.on("changed", target => {
    console.log("changed ip", target.mac, "from", target.oldIP, "to", target.newIP);
});