[zamadatix]

There are 3 main types of "random Wi-Fi MAC addresses". The most well known one is randomization of the MAC while the client is probing from SSIDs (prior to connection). This has been around for many years and doesn't change the actual connection MAC later on. Another randomization type that's slightly more common these days (e.g. iPhones default to it now) is choosing a random MAC per SSID. That way you can't be tracked by MAC across multiple networks but you still have consistency for captive portals and business networks. The third is true rotating randomization - this is relatively uncommon as it breaks captive portals (there is no well known algorithm or it'd be relatively pointless). iPhones were going to adopt this with rolling MACs but it was too broken and offered little over approach 2 in terms of privacy.