Cancer.gov · Domain Security

Cancer Gov Domain Security

Domain security

Domain security posture for Cancer.gov, 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 present, SPF present, DMARC present (p=reject).

CancerFederal GovernmentHealthcareResearchClinical TrialsGenomicsSurveillanceOpen Data

Transport & Host Security

www.cancer.gov
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 2 12:17:56 2026 GMT
api.cancer.gov
HTTPS: no · HSTS: no
clinicaltrialsapi.cancer.gov
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 18 23:59:59 2026 GMT

Domain (DNS/Email) Security

cancer.gov
DNSSEC: yes · SPF: yes · DMARC: yes (p=reject) · CAA: yes

Source

Domain Security

Raw ↑ 
generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.cancer.gov
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep  2 12:17:56 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: api.cancer.gov
  https: false
- host: clinicaltrialsapi.cancer.gov
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 18 23:59:59 2026 GMT
  hsts: true
  hsts_max_age: 31536000
domains:
- domain: cancer.gov
  dnssec: true
  caa:
  - 0 issue "godaddy.com"
  - 0 issue "identrust.com"
  - 0 issue "sectigo.com"
  - 0 issue "letsencrypt.org"
  - 0 issue "amazon.com"
  - 0 issue "entrust.net"
  spf: true
  dmarc: true
  dmarc_policy: reject