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Companies / US

Substack

substack.com6 facts from HTTP + DNSLast verified 17 Sept 2026

Substack sits behind Cloudflare and is built with Express. Its mail goes through Mailgun.

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CDN & edge

  • Confidence 95 of 100, certainCloudflare

DNS

  • Confidence 95 of 100, certainCloudflare DNS

Frameworks

  • Confidence 90 of 100, certainExpress

Email

MX records show the mailbox; SPF shows services allowed to send

  • Confidence 90 of 100, certainMailgun
  • Confidence 85 of 100, strongGoogle Workspace

Support

  • Confidence 75 of 100, strongZendesk

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