Gets the current list of possible servers in the local networks.
function getServers () {
  var interfaces = os.networkInterfaces()
  var result = []

  for (var key in interfaces) {
    var addresses = interfaces[key]
    for (var i = addresses.length; i--;) {
      var address = addresses[i]
      if (address.family === 'IPv4' && !address.internal) {
        var subnet = ip.subnet(address.address, address.netmask)
        var current = ip.toLong(subnet.firstAddress)
        var last = ip.toLong(subnet.lastAddress) - 1
        while (current++ < last) result.push(ip.fromLong(current))
      }
    }
  }

  return result
}