SparkLAN WUBR-508N

Overview
"10G031 300-0C" and "DATE:" is silkscreened on the board in the FCC photos. This would seem to indicate that this device was manufactured by CC&C.

Likely 00:0E:8E OUI

Links of Interest
508N product page 508N datasheet 508N(M) product page 508N(M) datasheet