Arch Coal · Domain Security

Arch Coal Domain Security

Domain security

Domain security posture for Arch Coal, probed live across 3 host(s) and 2 registrable domain(s). 1 host(s) serve HTTPS (up to TLSv1.3); 0 advertise HSTS. Email/DNS controls: DNSSEC absent, SPF absent, DMARC absent.

MiningCoalMetallurgical CoalThermal CoalEnergyFortune 500

Transport & Host Security

www.arch-coal.com
HTTPS: no · HSTS: no
archresources.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Jan 11 19:52:35 2027 GMT
api.archresources.com
HTTPS: no · HSTS: no

Domain (DNS/Email) Security

arch-coal.com
DNSSEC: no · SPF: no · DMARC: no · CAA: none
archresources.com
DNSSEC: no · SPF: no · 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.arch-coal.com
  https: false
- host: archresources.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Jan 11 19:52:35 2027 GMT
  hsts: false
- host: api.archresources.com
  https: false
domains:
- domain: arch-coal.com
  dnssec: false
  caa: []
  spf: false
  dmarc: false
- domain: archresources.com
  dnssec: false
  caa: []
  spf: false
  dmarc: true
  dmarc_policy: reject