Where can I get an online car history report for free?

Carfax.com wants a credit card, autocheck.com wants a credit card, and the DMV sends me to autocheck. I’m just trying to get some info on a used car that I want to check out. It’s not at a dealership and I just want to see if there’s anything wrong with the thing. I’d really prefer answers that pertain to the internet. I’m not able right now to go out to the DMV to check anything.