It isn't always easy. It would help to know why you are asking, such as if you are renting or plan to.

Since foreclosures can take many months, as owners come up with dribs and drabs of payment to forestall it, as well as banks not really wanting to sell at a loss, owners, real estate agents, and even lenders may evade your questions until the foreclosure is final. It isn't really any of your business if you are just wondering.