Is there a site where i can check the ID without having to pay carfax? Thanks

No, usually not. Ask the owner for all records of the car if they have them. If you look at the price you would be spending on the car, the report might not be a bad thing to invest in to give you some peace of mind.

I was just curious about my cars

I see, have you seen a carfax report before?

yes. I see that my Mustang had 3 owners and my van had 8,and i wanted to see where they were.