Thank you for your answer! i have found that i have made a mistake in my post. Please allow me to clarify a bit, the Wifi Bee supports only static IP. But the router or ISP provides only DHCP services. So i have to assign a static ip to the wifi bee manually by "address reservation", which in turns requires my wifi bee's MAC. After several attempts, i have checked through my router network that there is not any connection between the bee and my router even though the LED indicating Wifi_ON status is lit. So it comes to my senses that maybe the MAC on this little bee is wrong? I am sorry for confusing you.