Subdomains using Cloud Flare is marked med an orange cloud. Subdomains without are marked with a grey cloud.

CloudFlare network can only handle trafic over port 80 and 443. The following subdomains should be marked with a grey cloud:

• cpanel
• ftp
• mail
• webmail

Follow the link below for a complete list:
https://support.cloudflare.com/hc/en-us/articles/200169626-What-subdomains-are-appropriate-for-orange-gray-clouds-