https://devzone.nordicsemi.com/f/nordic-q-a/56422/802-15-4-device-extended-addressHello, I changed the 802_15_4/wireless_uart example to use MAC_ADDR_LONG. I am setting the extended address to (NRF_FICR-&gt;DEVICEADDR[ 0 ] | (( uint64_t )NRF_FICR-&gt;DEVICEADDR[ 1 ])&lt;&lt; 32 ) but as I read this is just a random number. Is this complianten-USTelligent Community 13Fri, 10 Jan 2020 12:43:52 GMThttps://devzone.nordicsemi.com/thread/228563?ContentTypeID=1Fri, 10 Jan 2020 12:43:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a5997f4-b499-4332-875a-af0afbbf653bHung Bui<p>Hi Meister,&nbsp;</p> <p><br />You are right, EUI-64 is generated from a MAC address and the MAC address should have the OUI assigned by IEEE.</p> <p>So it&#39;s recommended that you get register and get the OUI from IEEE and generate 48bit MAC and EUI-64 from that.&nbsp;</p><div style="clear:both;"></div>