Optimism · Domain Security

Optimism Domain Security

Domain security

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

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Transport & Host Security

www.optimism.io
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Aug 20 20:53:43 2026 GMT
docs.optimism.io
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 26 15:11:25 2026 GMT
mainnet.optimism.io
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Oct 2 00:00:16 2026 GMT

Domain (DNS/Email) Security

optimism.io
DNSSEC: yes · SPF: yes · DMARC: yes (p=quarantine) · 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.optimism.io
  https: true
  tls_version: TLSv1.3
  cert_expires: Aug 20 20:53:43 2026 GMT
  hsts: true
  hsts_max_age: 63072000
- host: docs.optimism.io
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 26 15:11:25 2026 GMT
  hsts: true
  hsts_max_age: 63072000
- host: mainnet.optimism.io
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  2 00:00:16 2026 GMT
  hsts: null
domains:
- domain: optimism.io
  dnssec: true
  caa:
  - 0 issuewild "digicert.com; cansignhttpexchanges=yes"
  - 0 issuewild "letsencrypt.org"
  - 0 issuewild "pki.goog; cansignhttpexchanges=yes"
  - 0 issuewild "ssl.com"
  - 0 issue "amazon.com"
  - 0 issue "comodoca.com"
  spf: true
  dmarc: true
  dmarc_policy: quarantine