Kellogg’s Club Crackers bearing an O/KD are DE (dairy equipment). This should not be confused with Kellogg’s Club Crisps Baked Snacks, which contain actual dairy ingredients.

From The O/U: Spicy Ranch Chipoys
The O/U certifies Spicy Ranch Chipoys as an O/UD (dairy) product. Some labels have a plain O/U mark without the “D” designation.