Node.js LAN port scanner

gistfile1.js

var net = require('net');
var dns = require('dns');

var startAddress = "194.47.158.";
var scanAddress  = "194.47.158.252";
var scanPort     = 5357;

scanByPort(startAddress, scanPort, function (scanlist) {
	console.log(startAddress+"*: [ "+scanlist.join(", ")+" ]");

	scanPorts(scanAddress, function (list) {
		console.log(scanAddress+" [ "+list.join(", ")+" ]");
	});
});

function scanByPort(startAddress, port, callback) {

	var toScan = 0;
	var scanlist = [];

	for (var i = 0; i < 256; i++) {
		toScan++;
		(function (i) {
			var client = net.connect({
				host: startAddress+i,
				port: port
			}, function () {
				console.log(startAddress+i+"\t:"+port);
				scanlist.push(i);
				
			});
			client.on('error', function () {});
			client.on('data', function (data) {
				console.log(data.toString());
			});
			client.on('close', function () {
				toScan--;
				if (toScan === 0) {
					scanlist.sort(function(a,b){return a-b});
					callback(scanlist);
				}
			});
			setTimeout(function () {
				client.destroy();
			}, 300);
		}(i));
	}

}



function scanPorts(ip, callback) {
	var list = [];
	var toScan = 0;
	for (var i = 0; i < 60000; i+=1000) {
		toScan+=1000;
		(function (i) {
			setTimeout(function () {
				//console.log('trying interval '+i);
				for (var k = 0; k < 1000; k++) {
					
					var port = i+k;
					(function (port) {
						var client = net.connect({
							host: ip,
							port: port
						}, function () {
							console.log(scanAddress+"\t:"+port);
							list.push(port);
						});
						client.on('error', function () {
							//console.log(port)
						});
						client.on('close', function () {
							toScan--;
							if (toScan === 0) {
								list.sort(function(a,b){return a-b});
								//console.log(list);
								callback(list);
							}
						});
						
						setTimeout(function () {
							client.destroy();
						}, 300);
					}(port));
				}
			}, (i/1000)*200);
			
		}(i));
	}
}