Companies House · Domain Security

Companies House Domain Security

Domain security

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

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Transport & Host Security

www.gov.uk
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Dec 28 22:06:14 2026 GMT
developer.company-information.service.gov.uk
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 22 23:59:59 2026 GMT
api.company-information.service.gov.uk
HTTPS: yes · TLS: TLSv1.2 · HSTS: no · cert expires: Sep 22 23:59:59 2026 GMT

Domain (DNS/Email) Security

www.gov.uk
DNSSEC: yes · SPF: no · DMARC: no · CAA: yes
service.gov.uk
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.gov.uk
  https: true
  tls_version: TLSv1.3
  cert_expires: Dec 28 22:06:14 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: developer.company-information.service.gov.uk
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 22 23:59:59 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: api.company-information.service.gov.uk
  https: true
  tls_version: TLSv1.2
  cert_expires: Sep 22 23:59:59 2026 GMT
  hsts: null
domains:
- domain: www.gov.uk
  dnssec: true
  caa:
  - www-cdn.production.govuk.service.gov.uk.
  - www-gov-uk.map.fastly.net.
  spf: false
  dmarc: false
- domain: service.gov.uk
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: reject