udp-free-port Get a free udp port, for node Install npm i udp-free-port --save Usage 'use strict' freeUdpPort(function (err, port) { if (err) { throw err // or do something else } // user your port! var socket = dgram.createSocket('udp4') socket.bind(port, function (err) { if (err) { throw err // or do something else } })}) License MIT