Duolingo · Domain Security

Duolingo Domain Security

Domain security

Domain security posture for Duolingo, probed live across 1 host(s) and 1 registrable domain(s). 1 host(s) serve HTTPS (up to TLSv1.3); 0 advertise HSTS. Email/DNS controls: DNSSEC absent, SPF present, DMARC present (p=reject).

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Transport & Host Security

www.duolingo.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Dec 24 23:59:59 2026 GMT

Domain (DNS/Email) Security

duolingo.com
DNSSEC: no · SPF: yes · DMARC: yes (p=reject) · CAA: none

Source

Domain Security

duolingo-domain-security.yml Raw ↑ 
generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.duolingo.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Dec 24 23:59:59 2026 GMT
  hsts: false
domains:
- domain: duolingo.com
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: reject