The best way is just to go directly to Amazon.com, and copy and paste the ASIN into the search bar on Amazon. It will pull the product right up. You can also use this with the UPC as well.
You can also plug the ASIN into the "Add Products" tab under the "Catalog" section in you seller central account (see the picture below). With this you can check also see if you are gated in the items you are researching right away.
Where can I look up a product in Amazon seller central?
