What punishment is given if a person commits adultery after divorce or during iddah?

I heard that if the person commits zina (adultery), if he wasn't married yet, he gets punished with something like 1 year prison and 40 lashes, if he commits adultery while he's married, it's considered a very bad sin and is punished with highest punishment. But what if the person was married and got divorced, is it categorized as the first case or the second? And also what happens if he commits adultery during his wife's iddah period (the 3 months period when he can still reconcile and can go back to the spouse), is it considered as the first penalty or the second?