code: public static boolean isMappedIPv4Address(String ipString) {
      byte[] bytes = ipStringToBytes(ipString);
      if (bytes != null && bytes.length == 16) {
        for (int i = 0; i < 10; i++) {
          if (bytes[i] != 0) {
            return false;
          }
        }
        for (int i = 10; i < 12; i++) {
          if (bytes[i] != (byte) 0xff) {
            return false;
          }
        }
        return true;
      }
      return false;
    }
docs: Evaluates whether the argument is an "IPv4 mapped" IPv6 address.
  
  <p>An "IPv4 mapped" address is anything in the range ::ffff:0:0/96 (sometimes written as
  ::ffff:0.0.0.0/96), with the last 32 bits interpreted as an IPv4 address.
  
  <p>For more on IPv4 mapped addresses see section 2.5.5.2 of <a target="_parent"
  href="http://tools.ietf.org/html/rfc4291#section-2.5.5.2">RFC 4291</a>.
  
  <p>Note: This method takes a {@code String} argument because {@link InetAddress} automatically
  collapses mapped addresses to IPv4. (It is actually possible to avoid this using one of the
  obscure {@link Inet6Address} methods, but it would be unwise to depend on such a
  poorly-documented feature.)
  
  @param ipString {@code String} to be examined for embedded IPv4-mapped IPv6 address format
  @return {@code true} if the argument is a valid "mapped" address
  @since 10.0