the.com/mac address
the serial number burned into your device's soul before it ever met a network.
means a unique 48-bit identifier hardwired into every network interface so routers know exactly which physical device they're talking to.
from short for media access control address, standardized in the 1980s as part of the ieee 802 networking specs so ethernet cards could identify themselves at the hardware level, unlike ip addresses which describe where you are, not what you are.
formatsix pairs of hex digits like 00:1a:2b
vendor tagfirst three pairs identify the manufacturer
spoofableeasily faked despite being called permanent
capacityover 281 trillion possible unique addresses
for instance
iphone privacy feature — apple randomizes mac addresses per network since ios 14, 2020
router mac filtering — home networks whitelist devices by address, easily bypassed
wireshark captures — security analysts trace device activity via mac in packet headers