generated: '2026-07-27'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.ferc.gov
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 12 10:19:17 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: data.ferc.gov
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 23 15:14:32 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: api.data.ferc.gov
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 24 18:21:24 2026 GMT
  cert_issuer: Let's Encrypt
  hsts: true
  hsts_max_age: 31536000
  hsts_include_subdomains: true
  hsts_preload: true
  hsts_note: >-
    The automated probe recorded hsts null because the gateway answers HEAD / differently; a live
    GET on 2026-07-27 returned "strict-transport-security: max-age=31536000; includeSubDomains;
    preload". Corrected from the observed response.
  security_headers:
  - 'x-content-type-options: nosniff'
  - 'x-frame-options: DENY'
  - 'x-xss-protection: 1; mode=block'
  - 'access-control-allow-origin: *'
  gateway: api.data.gov API Umbrella on cloud.gov
- host: ecollection.ferc.gov
  https: true
  tls_version: TLSv1.2
  tls_cipher: ECDHE-RSA-AES256-GCM-SHA384
  cert_expires: Feb 11 23:59:59 2027 GMT
  cert_issuer: DigiCert Global G2 TLS RSA SHA256 2020 CA1
  hsts: true
  hsts_max_age: 31536000
  hsts_include_subdomains: true
  hsts_preload: false
  security_headers:
  - 'content-security-policy: frame-ancestors https://*.ferc.gov:*'
  - 'x-xss-protection: 1; mode=block'
  - 'x-frame-options: ALLOW-FROM https://'
  note: >-
    Added by hand — the eForms API base host was not covered by the automated probe. It is the only
    FERC host observed negotiating TLS 1.2 rather than 1.3, and its X-Frame-Options value
    ("ALLOW-FROM https://") is malformed and ignored by modern browsers; the CSP frame-ancestors
    directive is what actually protects it.
  probed: '2026-07-27'
domains:
- domain: ferc.gov
  dnssec: true
  caa:
  - 0 iodef "hostmaster@ferc.gov"
  - 0 issue "digicert.com"
  - 0 issue "godaddy.com"
  - 0 issue "letsencrypt.org"
  - 0 issuewild "digicert.com"
  - 0 issuewild "godaddy.com"
  spf: true
  dmarc: true
  dmarc_policy: reject