kernel.org
Measuring…
kernel.org
Scanned:
84/ 100
Score by axis
- Security100
- SEO53
- Reputation100
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Fix what matters first
- 1Core Web Vitals (PageSpeed)+5
Improve Core Web Vitals — see the PageSpeed Insights report for specifics.
- 2Meta description+3
Add a <meta name="description"> of roughly 50–160 characters.
- 3Cache-Control+2
Set Cache-Control to control caching of HTML and static assets.
- 4Canonical URL+2
Add <link rel="canonical"> to avoid duplicate-content issues.
- 5robots.txt+2
Add a robots.txt to guide crawlers.
Recommendations are ranked by their impact on your score.
All checks
Security
100/ 100- Pass
HTTPS & HTTP→HTTPS redirect
HTTPS available; HTTP redirects to HTTPS
- Pass
TLS certificate validity
Valid; expires in 65 days
expires 2026-09-13 · YE1 - Pass
HSTS (Strict-Transport-Security)
Present
max-age=15768001 - Pass
Content-Security-Policy
Present
default-src 'self' *.kernel.org; img-src https: data: - Pass
Core security headers
All present
- Pass
Mixed content (HTTP on HTTPS)
No insecure (http://) subresources
- Pass
SPF email anti-spoofing
record present
v=spf1 include:_spf.kernel.org ~all - Pass
DMARC email anti-spoofing
record present
v=DMARC1; p=quarantine; rua=mailto:dmarc@kernel.org - N/A
Vulnerable front-end libraries
No recognizable front-end library versions detected
Performance
65/ 100- Pass
Time to First Byte
11 ms
- Pass
Text compression
Enabled (gzip)
- Pass
HTTP/2 or HTTP/3
HTTP/2.0
- Warn
Cache-Control
No Cache-Control header
Set Cache-Control to control caching of HTML and static assets.
- Warn
Core Web Vitals (PageSpeed)
perf 98/100, 1627ms, 0.00 (field)
Improve Core Web Vitals — see the PageSpeed Insights report for specifics.
SEO
53/ 100- Pass
Page title
The Linux Kernel Archives
- Fail
Meta description
Missing meta description
Add a <meta name="description"> of roughly 50–160 characters.
- Warn
Canonical URL
No canonical link
Add <link rel="canonical"> to avoid duplicate-content issues.
- Warn
robots.txt
No robots.txt found
Add a robots.txt to guide crawlers.
- Warn
XML sitemap
No sitemap found
Publish a sitemap.xml and reference it from robots.txt.
- Pass
Single H1
1 H1 tag(s)
The Linux Kernel Archives - Pass
Image alt text
8/8 images have alt (100%)
- Warn
Structured data (JSON-LD)
No structured data
Add schema.org to enable rich results.
Infrastructure
100/ 100- N/A
CMS detection
No CMS fingerprint detected
- N/A
CMS known vulnerabilities
No CMS detected
- Pass
Web server
nginx
- N/A
CDN detection
No CDN fingerprint detected
- Pass
TLS version
TLS 1.3
- Pass
IPv6 (AAAA record)
AAAA record present
2600:3c04:e001:324:0:1991:8:25
Reputation
100/ 100- Pass
Google Safe Browsing
Not flagged
- Pass
Domain blacklist status
Not on major blocklists
checked: Spamhaus DBL, SURBL - Pass
Domain age
Registered 1997-03-07 (~357 months)
- Pass
Domain expiry
Expires in 240 days
2027-03-08
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