Why fight Cloudflare Turnstile or JS Challenges if the target webmaster forgot to restrict their origin server firewall to Cloudflare IP ranges? ### 4-Step Origin IP Discovery Workflow: 1. **Censys / Shodan SSL Search**: Query `services.tls.certificates.leaf_data.names: targetdomain.com` to find every IPv4 presenting a valid Let's Encrypt cert for that domain. 2. **SPF / Mail Header Leak**: Check `TXT` records for `v=spf1 ip4:...` or trigger a password-reset email and inspect the `Received: from` origin IP header. 3. **Favicon MurmurHash3**: Compute the `mmh3` hash of `/favicon.ico` and search Shodan for `http.favicon.hash:<hash>`. 4. **Direct Host Header Request**: ```bash curl -k --resolve targetdomain.com:443:198.51.100.42 https://targetdomain.com/api/v1/data ``` If it returns `200 OK`, you can scrape at 1,000 req/sec completely bypassing Cloudflare WAF!