I did an internet search and came here. One of the closed posts deals with 2 devices sharing the same MAC address. I have the same problem, however it is both my wife's and my smartphones that share the same MAC address. As you can imagine, this has caused intermittent wifi issues since we bought the phones (at exactly the same time) in 2011. I have been in touch with the manufacturer (Samsung) and discussions are on-going. What concrens me is that there may be more phones like ours that share the same MAC address. The number looks like something that would be a test address or something like that.