SimilarWeb · Domain Security

Similarweb Domain Security

Domain security

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

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Transport & Host Security

www.similarweb.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Nov 14 23:59:59 2026 GMT
developers.similarweb.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 23 12:15:51 2026 GMT
api.similarweb.com
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Nov 12 23:59:59 2026 GMT

Domain (DNS/Email) Security

similarweb.com
DNSSEC: no · SPF: yes · DMARC: yes (p=quarantine) · 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.similarweb.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Nov 14 23:59:59 2026 GMT
  hsts: null
- host: developers.similarweb.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 23 12:15:51 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: api.similarweb.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Nov 12 23:59:59 2026 GMT
  hsts: null
domains:
- domain: similarweb.com
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: quarantine