In our home spanking is done for both pleasure and punishment.
Pleasure: Use the hand or a cane or even a lite impact with a wooden paddle. The attached picture is of a submissive I was playing with, and she indicated she didn't feel any of the pain from previous play. So i got out the paddle that is next to her butt, and gave her three hard smacks. The bruising lasted a week, and she was quite happy about it. I hit her so hard it broke the paddle as you can see.
Punishment: The words and actions used, accompanied by how I carry out the punishment make it a punishment. If I am going to punish my slave, I have her bare assed and leaning against the bed. This allows me to cause quick harsh pain with very little "warming" to build the pain tolerance. This method is quick and harsh. It forces the submissive to think about her actions and the resulting pain, rather than enjoy the endorphines released during a more structured drawn out activity. I have a paddle that is shaped like a miniature boat oar. If I even mention it, her behavior immediately changes to how I wish her to behave.