 | 1 | initial version |
Looks like MAC address randomization:
MAC addresses can either be universally administered or locally administered. Universally administered and locally administered addresses are distinguished by setting the second-least-significant bit of the most significant byte of the address (the U/L bit).
One way to overcome this privacy concern is by using randomly generated MAC addresses. As described in the previous section, the IEEE 802 addressing includes one bit to specify if the hardware address is locally or globally administered. This allows generating local addresses without the need of any global coordination mechanism to ensure that the generated address is still unique within the local network. This feature can be used to generate random addresses, which decouple the globally-unique identifier from the device and therefore make it more difficult to track a user device from its MAC/ L2 address [enhancing_location_privacy].
MAC format showing position of LG bit:
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
CyberChef - hex to binary for MAC address
ba:b2:a3:17:7b:b3 10111010 10110010 10100011 00010111 01111011 10110011
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) 1011 1010 1011 0010 1010 0011
LG bit is set in the MAC address.
(Related where search is needed for Random MAC addresses: Wireshark Random MAC Address display filter)
