I assume you're looking at one of those fake RealtyTrac listings for foreclosures. They don't list an address because it's not a real foreclosure yet. It's possible that the sellers are behind on their payments. It doesn't mean it is going to be foreclosed on. If you're looking to buy, you should find a Realtor who can represent you as a Buyer's Agent. He/she can find any and all available properties in your price range -- foreclosures as well as regular homes.
P.S. Foreclosure aren't necessarily great deal. They usually sell for "Fair Market Value" and more often then not they have issues.