github.com
Measuring…
github.com
Scanned:
81/ 100
Score by axis
- Security100
- SEO52
- Reputation100
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Changes since your last scan
Previous scan:
Measurement changed(1)
Fix what matters first
- 1Core Web Vitals (PageSpeed)+8
Improve Core Web Vitals — see the PageSpeed Insights report for specifics.
- 2Image alt text+3
Most images lack alt text — add descriptive alt attributes.
- 3Meta description+2
Aim for a meta description of about 50–160 characters.
- 4XML sitemap+2
Publish a sitemap.xml and reference it from robots.txt.
- 5Single H1+2
Use a single <h1> per page.
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 84 days
expires 2026-09-30 · Sectigo Public Server Authentication CA DV E36 - Pass
HSTS (Strict-Transport-Security)
Present
max-age=31536000; includeSubdomains; preload - Pass
Content-Security-Policy
Present
default-src 'none'; base-uri 'self'; child-src github.githubassets.com github.co… - 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 ip4:192.30.252.0/22 include:spf.protection.outlook.com include:_netblocks.google.com include:_netblocks2.google.com include:mail.zendesk.com include:_spf.salesforce.com include:servers.mcsv.net… - Pass
DMARC email anti-spoofing
record present
v=DMARC1; p=quarantine; sp=reject; pct=100; rua=mailto:dmarc@github.com; ruf=mailto:dmarc@github.com; fo=1 - N/A
Vulnerable front-end libraries
No recognizable front-end library versions detected
Performance
63/ 100- Pass
Time to First Byte
7 ms
- Pass
Text compression
Enabled (gzip)
- Pass
HTTP/2 or HTTP/3
HTTP/2.0
- Pass
Cache-Control
max-age=0, private, must-revalidate
- Fail
Core Web Vitals (PageSpeed)
perf 40/100, 3194ms, 0.27 (field)
Improve Core Web Vitals — see the PageSpeed Insights report for specifics.
SEO
52/ 100- Pass
Page title
GitHub · Change is constant. GitHub keeps you ahead. · GitHub
- Warn
Meta description
190 characters
Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.Aim for a meta description of about 50–160 characters.
- Pass
- Pass
- Warn
XML sitemap
No sitemap found
Publish a sitemap.xml and reference it from robots.txt.
- Warn
Single H1
4 H1 tag(s)
Use a single <h1> per page.
- Fail
Image alt text
7/24 images have alt (29%)
Most images lack alt text — add descriptive alt attributes.
- Warn
Structured data (JSON-LD)
No structured data
Add schema.org to enable rich results.
Infrastructure
77/ 100- N/A
CMS detection
No CMS fingerprint detected
- N/A
CMS known vulnerabilities
No CMS detected
- Pass
Web server
github.com
- N/A
CDN detection
No CDN fingerprint detected
- Pass
TLS version
TLS 1.3
- Warn
IPv6 (AAAA record)
No AAAA record
Add an AAAA record to serve visitors over IPv6.
Reputation
100/ 100- Pass
Domain blacklist status
Not on major blocklists
checked: Spamhaus DBL, SURBL - Pass
Domain age
Registered 2007-10-09 (~228 months)
- Pass
Domain expiry
Expires in 93 days
2026-10-09
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