What is the source address for Ethernet?

$00$:$00$:$1$c$\_$aa:bb:dd

$192\mathrm{.}168\mathrm{.}0\mathrm{.}193$

$00$:$00$:$1$b$\_22$:$33$:$55$

$62\mathrm{.}200\mathrm{.}135\mathrm{.}84$