I set up Cloudflare and as suggested, I blocked all traffic to my IP unless it comes from Cloudflare. To do so, I whitelisted the IP ranges listed here: https://www.cloudflare.com/ips/
But it seems they are not complete. Some traffic from similar IPs (173.245.52., 173.245.54.) was blocked which led to problems with the site. These ranges do not appear on the mentioned page.
Where can I get the full list of Cloudflare IP ranges? Any ideas?