Vistra · Domain Security

Vistra Domain Security

Domain security

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

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Transport & Host Security

www.vistra.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 8 05:46:36 2026 GMT
help.vistra.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 28 08:20:16 2026 GMT
api.vistra.com
HTTPS: no · HSTS: no

Domain (DNS/Email) Security

vistra.com
DNSSEC: no · 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.vistra.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  8 05:46:36 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: help.vistra.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 28 08:20:16 2026 GMT
  hsts: true
  hsts_max_age: 15552000
- host: api.vistra.com
  https: false
domains:
- domain: vistra.com
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: reject