ESP8266 Developer Zone The Official ESP8266 Forum 2015-05-07T17:48:17+08:00 https://bbs.espressif.com:443/feed.php?f=7&t=428 2015-05-07T17:48:17+08:00 2015-05-07T17:48:17+08:00 https://bbs.espressif.com:443/viewtopic.php?t=428&p=1653#p1653 <![CDATA[Re: MAC addresses]]>
Thanks for your interest in ESP8266.

MAC addresses of ESP8266 are unique.

Statistics: Posted by ESP_Faye — Thu May 07, 2015 5:48 pm

]]> 2015-05-04T22:07:58+08:00 2015-05-04T22:07:58+08:00 https://bbs.espressif.com:443/viewtopic.php?t=428&p=1615#p1615 <![CDATA[MAC addresses]]> Are MAC addresses burned into ESP8266 ROM ? (i know there are AT commands to change MAC; I am interested only in the default MAC provided by vendor)
Will Espressif have more than 1 OUI ?

I see the OUI (first 3 octets of MAC) for Espressif are:
18:FE:34 - for STA
1A:FE:34 - for AP
For one specific ESP8266 module, the NIC (last 3 octets of MAC) are the same for STA and AP.
I have several ESP8266 modules and I can see all of them have different MAC address (last 3 octets of MAC are different).

But using only 1 OUI, with the last 3 octets (NIC) different, there can only be around 16 million unique MAC addresses.
So, using only 1 OUI, after making around 16 million ESP8266 chips, the MAC addresses will overlap.

Statistics: Posted by taribo — Mon May 04, 2015 10:07 pm

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