I just tried https://webmd.im/verispy last year to see if I could Locate my birth-father. My bio father left me when I was 7, and has refused to be a part of my life since. I grew up with my bio Mother and Step-father. I have only ever talked to my biological father a couple times until now. All I knew of him personally when I conducted the search was his first name, last name, and the street address of a previous address he used to have.
When the search results came back based on the minimal info I had, It pulled up a recent address along with even a phone number. When I called the phone no., I heard the voice of what sounded like it may be my step-brother. I asked if Joseph(my biological dad) was there, and he said no but to try back after 5.
I haven't done anything with the info, But I found what I was wanting to have.