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Re:Show HN: Does it use Cloudflare? by baptistem on Friday February 24, 2017 @03:06AM (#13721922)
otherwise :

dig website.com +short | head -n1 | xargs -- whois | grep -q cloudflare

Re:Show HN: Does it use Cloudflare? by gkya on Friday February 24, 2017 @06:04AM (#13722613)
doesn't work with my setup, whois on cloudflare domains do not inlcude the string "cloudflare". This works tho:

  dig website.com +short |  grep -q cloudflare