Why did the free credit check ask me for a cc number?

I need a credit check on myself. I have done this in the past, and never needed a credit card number.
Does anyone know of a free credit check without giving a credit card number?

if you are looking for the free credit check usa national site, check out this site

http://free-credit-check-national.com/

Here you can check your 3-in-1 Report from all three credit reporting agencies and your credit score rating.

Because it's not really free! You have to sign up for an expensive and fairly useless credit monitoring service to get your "free" credit report. While you can cancel the service during the "free" period (typically around 7 to 14 days) it can be difficult to figure out how to do so. Many of these services will bury the instructions in file print during the sign-up process and if you don't write it down separately at that time it may be nearly impossible to cancel the service quickly enough to avoid the charge on your credit card.

You can get a really free copy of your credit report -- once each year from each of the Big Three reporting agencies -- at http://www.AnnualCreditReport.com

https://www.annualcreditreport.com/cra/i…

you can use this site once every 12 months, totally free.