This is a simple script that downloads the top 10 million most popular website and does a lookup to check if its a part of cloudflare network. Results will be written to cloudflare_protected_domains.txt
After looking up the domain, the script will then try to connect to port 443 and make a HEAD request
If the server replies with headers found in cloudflare protected sites, the domain will be written to accessible_cloudflare_protected_domains.txt
If the domain resolves to a ip address on cloudflare's network but the connection fails for some reason, the domain will be written to unaccessible_cloudflare_protected_domains.txt
Cloudflare is a useful service to hide behind as ip blocks generally don't apply to Cloudflare. To bypass firewall solutions (like the GFW) you will need to know which domains are blocked and which aren't.
Create a file named .always-fresh-cloudflare-lists for the script to automatically delete generated accessible and unaccessible cloudflare domains
Script will always look for a file cloudflare_domain_list.txt and loads that to check instead of the top10milliondomains list
unaccessible_cloudflare_domains_cn.txt and accessible_cloudflare_domains_cn.txt are lists of domains collected behind the GFW. Unaccessible domains are domains that can't be reached behind the GFW while reachable from a uncensored network. Accessible domains are domains that can be reached from behind the GFW.