private static String getIpAddress(Computer computer)
      throws RequestUnsuccessfulException, DigitalOceanException {
    Droplet instance = computer.updateInstanceDescription();

    for (final Network network : instance.getNetworks().getVersion4Networks()) {
      String host = network.getIpAddress();
      if (host != null) {
        return host;
      }
    }

    return null;
  }