Cliffs Natural Resources · Domain Security

Cliffs Natural Resources Domain Security

Domain security

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

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Transport & Host Security

www.clevelandcliffs.com

HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 20 19:04:39 2026 GMT

Domain (DNS/Email) Security

clevelandcliffs.com

DNSSEC: yes · SPF: yes · DMARC: yes (p=quarantine) · CAA: none

Source

Domain Security

generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.clevelandcliffs.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 20 19:04:39 2026 GMT
  hsts: true
  hsts_max_age: 31536000
domains:
- domain: clevelandcliffs.com
  dnssec: true
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: quarantine