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Companies / US

Y Combinator

ycombinator.com11 facts from DNS + HTTPLast verified 17 Sept 2026

Y Combinator sits behind Cloudflare. Its mail goes through Google Workspace.

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CDN & edge

  • Confidence 95 of 100, certainCloudflare

DNS

  • Confidence 95 of 100, certainAmazon Route 53

UI & fonts

  • Confidence 90 of 100, certainGoogle Fonts

Analytics

  • Confidence 90 of 100, certainGoogle Analytics
  • Confidence 90 of 100, certainPostHog

Email

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

  • Confidence 95 of 100, certainGoogle Workspace
  • Confidence 80 of 100, strongMailgun

Marketing

  • Confidence 80 of 100, strongMailchimp

Workspace accounts

Verification records: an account exists, usage unknown

  • Confidence 70 of 100, likelyMicrosoft 365
  • Confidence 70 of 100, likelyOpenAI
  • Confidence 70 of 100, likelyZoom

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