code: public boolean isIPv4Mapped() {
  		//::ffff:x:x/96 indicates IPv6 address mapped to IPv4
  		if(getSegment(5).matches(IPv6Address.MAX_VALUE_PER_SEGMENT)) {
  			for(int i = 0; i < 5; i++) {
  				if(!getSegment(i).isZero()) {
  					return false;
  				}
  			}
  			return true;
  		}
  		return false;
  	}
docs: Whether the address is IPv4-mapped
  
  ::ffff:x:x/96 indicates IPv6 address mapped to IPv4