Notion · Domain Security

Notion Domain Security

Domain security

Domain security posture for Notion, 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=quarantine).

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Transport & Host Security

www.notion.so
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 13 23:41:14 2026 GMT
developers.notion.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Aug 24 09:55:45 2026 GMT
api.notion.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Aug 14 02:58:03 2026 GMT

Domain (DNS/Email) Security

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

Source

Domain Security

Raw ↑ 
generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.notion.so
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 13 23:41:14 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: developers.notion.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Aug 24 09:55:45 2026 GMT
  hsts: true
  hsts_max_age: 63072000
- host: api.notion.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Aug 14 02:58:03 2026 GMT
  hsts: true
  hsts_max_age: 31536000
domains:
- domain: notion.so
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: quarantine
- domain: notion.com
  dnssec: true
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: reject