Duo Security · Domain Security

Duo Security Domain Security

Domain security

Domain security posture for Duo Security, probed live across 2 host(s) and 2 registrable domain(s). 2 host(s) serve HTTPS (up to TLSv1.3); 2 advertise HSTS. Email/DNS controls: DNSSEC absent, SPF present, DMARC present (p=reject).

AuthenticationMFAZero TrustIdentity

Transport & Host Security

duo.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Dec 5 23:59:59 2026 GMT
api-xxxxxxxx.duosecurity.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 23 23:59:59 2026 GMT

Domain (DNS/Email) Security

duo.com
DNSSEC: no · SPF: yes · DMARC: yes (p=reject) · CAA: yes
duosecurity.com
DNSSEC: no · SPF: yes · DMARC: yes (p=reject) · CAA: yes

Source

Domain Security

Raw ↑ 
generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: duo.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Dec  5 23:59:59 2026 GMT
  hsts: true
  hsts_max_age: 63072000
- host: api-xxxxxxxx.duosecurity.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 23 23:59:59 2026 GMT
  hsts: true
  hsts_max_age: 63072000
domains:
- domain: duo.com
  dnssec: false
  caa:
  - 0 issue "digicert.com"
  - 0 issue "globalsign.com"
  - 0 issue "identrust.com"
  - 0 issue "letsencrypt.org"
  - 0 issue "pki.goog"
  - 0 issue "starfieldtech.com"
  spf: true
  dmarc: true
  dmarc_policy: reject
- domain: duosecurity.com
  dnssec: false
  caa:
  - 0 issue "identrust.com"
  - 0 issue "letsencrypt.org"
  - 0 issue "pki.goog"
  - 0 issue "starfieldtech.com"
  - 0 issue "amazon.com"
  - 0 issue "amazonaws.com"
  spf: true
  dmarc: true
  dmarc_policy: reject