This MAC address identifies the relevant system as having been manufactured by Dell. If Dell has done its job properly (and there is no evidence to the contrary), no other Ethernet interface on the planet should have that same MAC address.
Is that meant to be true anymore? I know it used to be, but I have seen a lot of collisions from various vendors. Usually we were told that they only tried to keep the probability down to no MAC collisions in say a Class A network, but that they couldn't guarantee more than that.
I remember trying that on a couple of networks and that caused all kinds of issues with routers that used 00:00:00.. as a sort of 0.0.0.0 in broadcasts and such.