how to find out which server my domains direct to?
Welcome to the Cloudflare Community.
You should be able to identify your server by the IP that you set in your Cloudflare dashboard DNS app. If you are trying to determine what IP to use there, you will need to consult with your host.
Thank you for quick replay. How I can find out who provide hosting for me?
Check your accounts payable ledger or your bank statement to see who you pay for hosting.