Clozd · Domain Security

Clozd Domain Security

Domain security

Domain security posture for Clozd, probed live across 6 host(s) and 1 registrable domain(s). 6 host(s) serve HTTPS (up to TLSv1.3); 5 advertise HSTS. Email/DNS controls: DNSSEC absent, SPF present, DMARC present (p=quarantine).

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Transport & Host Security

www.clozd.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 1 23:41:30 2026 GMT
app.clozd.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Nov 29 23:59:59 2026 GMT
mcp.clozd.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Mar 4 23:59:59 2027 GMT
oauth.clozd.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 31 23:59:59 2026 GMT
help.clozd.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 2 00:00:49 2026 GMT
trust.clozd.com
HTTPS: yes · HSTS: yes

Domain (DNS/Email) Security

clozd.com
DNSSEC: no · SPF: yes · DMARC: yes (p=quarantine) · CAA: yes

Source

Domain Security

Raw ↑ 
generated: '2026-08-04'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.clozd.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  1 23:41:30 2026 GMT
  http_status: 200
  hsts: true
  hsts_max_age: 31536000
  hsts_include_subdomains: true
  hsts_preload: true
- host: app.clozd.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Nov 29 23:59:59 2026 GMT
  http_status: 200
  hsts: true
  hsts_max_age: 31536000
  hsts_include_subdomains: true
  hsts_preload: false
  note: API host — serves /public-api/v1|v2|v3 and the Swagger UI at /public-api/docs/.
- host: mcp.clozd.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Mar  4 23:59:59 2027 GMT
  http_status: 404
  hsts: false
  hsts_on_mcp_path: true
  hsts_max_age_on_mcp_path: 31536000
  note: >-
    The host root returns 404 with no HSTS header; the MCP endpoint itself (POST /mcp) does return
    Strict-Transport-Security max-age=31536000; includeSubDomains along with nosniff, X-Frame-Options
    SAMEORIGIN, a restrictive CSP (default-src 'none'), COOP and CORP.
- host: oauth.clozd.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 31 23:59:59 2026 GMT
  http_status: 404
  hsts: true
  hsts_max_age: 63072000
  hsts_include_subdomains: true
  hsts_preload: true
  note: Strongest HSTS posture of any Clozd host (2 years, preload).
- host: help.clozd.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  2 00:00:49 2026 GMT
  http_status: 302
  hsts: true
  hsts_max_age: 259200
  hsts_include_subdomains: true
  hsts_preload: false
  note: Zendesk-hosted help center; blocks non-browser user agents with 403.
- host: trust.clozd.com
  https: true
  http_status: 200
  hsts: true
  hsts_max_age: 31536000
  hsts_include_subdomains: true
  hsts_preload: false
  note: Vanta-hosted trust center.
domains:
- domain: clozd.com
  dnssec: false
  caa:
  - 0 issue "sectigo.com"
  - 0 issuewild "amazon.com"
  - 0 issuewild "sectigo.com"
  - 0 iodef "mailto:security@clozd.com"
  - 0 issue "amazon.com"
  - 0 issue "letsencrypt.org"
  caa_iodef: mailto:security@clozd.com
  spf: true
  dmarc: true
  dmarc_policy: quarantine
findings:
- CAA is configured on the apex, including an iodef reporting address — above average for this catalog.
- DMARC is published at p=quarantine rather than p=reject.
- DNSSEC is not enabled on clozd.com.
- HSTS is present on every host that serves content; mcp.clozd.com omits it on the host root.
x-evidence:
  fetched: '2026-08-04'
  method_detail: >-
    dig for CAA/SPF/DMARC/DNSSEC, openssl s_client for TLS version and certificate expiry, and curl -I for
    HTTP status and Strict-Transport-Security per host.