Stack Overflow · Domain Security

Stack Overflow Domain Security

Domain security

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

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Transport & Host Security

stackoverflow.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 15 13:00:40 2026 GMT
api.stackexchange.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 4 22:33:35 2026 GMT
api.stackoverflowteams.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Aug 28 09:32:11 2026 GMT

Domain (DNS/Email) Security

stackoverflow.com
DNSSEC: no · SPF: yes · DMARC: yes (p=reject) · CAA: yes
stackexchange.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: stackoverflow.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 15 13:00:40 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: api.stackexchange.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep  4 22:33:35 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: api.stackoverflowteams.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Aug 28 09:32:11 2026 GMT
  hsts: true
  hsts_max_age: 10368000
domains:
- domain: stackoverflow.com
  dnssec: false
  caa:
  - 0 issuewild "digicert.com; cansignhttpexchanges=yes"
  - 0 issuewild "letsencrypt.org"
  - 0 issuewild "pki.goog; cansignhttpexchanges=yes"
  - 0 issuewild "sectigo.com"
  - 0 issuewild "ssl.com"
  - 128 iodef "mailto:sysadmin-team@stackoverflow.com"
  spf: true
  dmarc: true
  dmarc_policy: reject
- domain: stackexchange.com
  dnssec: false
  caa:
  - 0 issuewild "digicert.com; cansignhttpexchanges=yes"
  - 0 issuewild "letsencrypt.org"
  - 0 issuewild "pki.goog; cansignhttpexchanges=yes"
  - 0 issuewild "sectigo.com"
  - 0 issuewild "ssl.com"
  - 128 iodef "mailto:sysadmin-team@stackoverflow.com"
  spf: true
  dmarc: true
  dmarc_policy: reject