StackBlitz · Domain Security

Stackblitz Domain Security

Domain security

Domain security posture for StackBlitz, 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 absent, SPF present, DMARC present (p=none).

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Transport & Host Security

stackblitz.com

HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Oct 1 23:59:59 2026 GMT

developer.stackblitz.com

HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 2 05:13:41 2026 GMT

webcontainers.io

HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Aug 23 01:13:50 2026 GMT

Domain (DNS/Email) Security

stackblitz.com

DNSSEC: no · SPF: yes · DMARC: yes (p=none) · CAA: none

webcontainers.io

DNSSEC: no · SPF: no · DMARC: no · CAA: none

Source

Domain Security

generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: stackblitz.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  1 23:59:59 2026 GMT
  hsts: false
- host: developer.stackblitz.com
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct  2 05:13:41 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: webcontainers.io
  https: true
  tls_version: TLSv1.3
  cert_expires: Aug 23 01:13:50 2026 GMT
  hsts: true
  hsts_max_age: 31536000
domains:
- domain: stackblitz.com
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: none
- domain: webcontainers.io
  dnssec: false
  caa: []
  spf: false
  dmarc: false