trace.js

/**
 * Intelligent Traceroute
 *
 * Do a traceroute on a domain, prints a json array
 * of the hops with their physical locations.
 *
 * //Example
 * node trace.js google.com
 *
 * npm install traceroute async underscore request
 */
var traceroute = require('traceroute')
  , async      = require('async')
  , _          = require('underscore')
  , request    = require('request')
  , util       = require('util')
  ;

function geoip (ip, done) {
  request.get({
    url: "http://freegeoip.net/json/"+ip,
    json: true
  }, function (err, res, body) {
    body.ip = ip;
    done(err, body);
  });
}

traceroute.trace(process.argv[2], function (err, hops) {
  if (err) throw err;

  var ips = _.map(hops, function (hop) {
    return  _.first(Object.keys(hop))
  });

  async.map(ips, geoip, function (err, results) {
    console.log(results);
  });

});