def mac_from_bridge_id(bridge_id: str) -> str:
    """Parse mac address from bridge id."""
    parts = [
        bridge_id[0:2],
        bridge_id[2:4],
        bridge_id[4:6],
        # part 6:10 needs to be left out (fffe)
        bridge_id[10:12],
        bridge_id[12:14],
        bridge_id[14:16],
    ]
    return ":".join(parts)