https://devzone.nordicsemi.com/f/nordic-q-a/6092/ble-advertising-packet-s-crc-can-be-5-bytesI Saw iBeacon Packet in the website (d6 be 89 8e) Access Address for Advertising (40 24) Header (05 a2 17 6e 3d 71) Mac address (02 01 1a 1a ff 4c 00 02 15 e2 c5 6d b5 df fb 48 d2 b0 60 d0 f5 a7 10 96 e0 00 00 00 00 c5) Bluetooth Advertisementen-USTelligent Community 13Wed, 18 Mar 2015 00:27:49 GMThttps://devzone.nordicsemi.com/thread/21326?ContentTypeID=1Wed, 18 Mar 2015 00:27:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3778ce13-836b-45b8-a3a7-deb62a0f43b8seanur<p>Thank you!!!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/21324?ContentTypeID=1Wed, 18 Mar 2015 00:27:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:51e63353-1a70-47a5-a68f-89f82d547be3seanur<p>Thank you!!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/21325?ContentTypeID=1Tue, 17 Mar 2015 16:51:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2dc6e057-cdfe-4b52-90ce-75ee2ab2c941Stian R&#248;ed Hafskjold<p>The checksum of the above packet is 0x52AB8D. So the two last bytes are probably just garbage.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/21323?ContentTypeID=1Tue, 17 Mar 2015 12:12:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:86ae70f1-8c7a-47b5-9f4d-6f5631ad6b2cJohn<p>You are right to be confused. BLE as defined by the core specification contains a 24 bit CRC. So, either the packet was parsed incorrectly, or there are 2 bytes of garbage at the end.</p><div style="clear:both;"></div>