Property ID numbers

Hi, I am very new at real estate investing. We have had some recent medical expenses and have nothing left to invest with. With our basement credit, I decided to do some bird-dogging to give us a base to work with. I found a site that gave the property id numbers and with them I could look up all I needed about the property, the mortgage, the taxes past due and everything. I was so sure that I bookmarked the page, but I was wrong. Can someone please tell me how to find it again? I need all the info I can get to be able to locate good buys for good fees so I can begin working for our family.
Thank you very much
john_n_teri