* @return {@link Inet4Address} of the embedded IPv4 address
   * @throws IllegalArgumentException if the argument is not a valid IPv4 compatible address
   */
  public static Inet4Address getCompatIPv4Address(Inet6Address ip) {
    checkArgument(
        isCompatIPv4Address(ip), "Address '%s' is not IPv4-compatible.", toAddrString(ip));

    return getInet4Address(Arrays.copyOfRange(ip.getAddress(), 12, 16));
  }

   * @return {@link Inet4Address} of the embedded IPv4 address
   * @throws IllegalArgumentException if the argument is not a valid IPv4 compatible address
   */
  public static Inet4Address getCompatIPv4Address(Inet6Address ip) {
    checkArgument(
        isCompatIPv4Address(ip), "Address '%s' is not IPv4-compatible.", toAddrString(ip));

    return getInet4Address(Arrays.copyOfRange(ip.getAddress(), 12, 16));
  }