Linux · Domain Security

Linux Domain Security

Domain security

Domain security posture for Linux, 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=quarantine).

KernelLinuxOpen SourceOperating SystemUnixUserspace API

Transport & Host Security

www.kernel.org
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Oct 18 00:52:15 2026 GMT
www.linuxfoundation.org
HTTPS: yes · TLS: TLSv1.3 · HSTS: yes · cert expires: Sep 9 04:42:18 2026 GMT
man7.org
HTTPS: yes · TLS: TLSv1.3 · HSTS: no · cert expires: Sep 19 19:55:29 2026 GMT

Domain (DNS/Email) Security

kernel.org
DNSSEC: no · SPF: yes · DMARC: yes (p=quarantine) · CAA: none
linuxfoundation.org
DNSSEC: no · SPF: yes · DMARC: yes (p=none) · CAA: none

Source

Domain Security

linux-domain-security.yml Raw ↑ 
generated: '2026-07-11'
method: probed
source: live DNS/TLS/HTTP probes of apis.yml + OpenAPI hosts
hosts:
- host: www.kernel.org
  https: true
  tls_version: TLSv1.3
  cert_expires: Oct 18 00:52:15 2026 GMT
  hsts: true
  hsts_max_age: 31557600
- host: www.linuxfoundation.org
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep  9 04:42:18 2026 GMT
  hsts: true
  hsts_max_age: 31536000
- host: man7.org
  https: true
  tls_version: TLSv1.3
  cert_expires: Sep 19 19:55:29 2026 GMT
  hsts: false
domains:
- domain: kernel.org
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: quarantine
- domain: linuxfoundation.org
  dnssec: false
  caa: []
  spf: true
  dmarc: true
  dmarc_policy: none