HollyFrontier · Domain Security

Hollyfrontier Domain Security

Domain security

Domain security posture for HollyFrontier, 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 absent, SPF present, DMARC absent.

Fortune 500EnergyOil and GasPetroleum RefiningFuelsLubricantsSpecialty ChemicalsDallas

Transport & Host Security

www.hollyfrontier.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 26 00:28:08 2026 GMT

Domain (DNS/Email) Security

hollyfrontier.com
DNSSEC: no · SPF: yes · DMARC: no · CAA: none

Source

Domain Security

hollyfrontier-domain-security.yml Raw ↑ 
generated: '2026-09-13'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.hollyfrontier.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 26 00:28:08 2026 GMT
  hsts: true
  hsts_max_age: 31536000
domains:
- domain: hollyfrontier.com
  dnssec: false
  caa: []
  spf: true
  dmarc: false

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