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semver.org
Semantic Versioning 2.0.0 | Semantic Versioning
Last scanned Jul 25, 2026, 2:25 PM · 2 views
Overall score
Excellent
Summary
Semantic Versioning spec and website. This website is hosted on Fastly. SEO is excellent (100/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100).
Semantic Versioning spec and website
- United States
- Hosted on Fastly
Top issues to fix
4 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
SEO
0 issue(s) found
Performance
5 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Semantic Versioning spec and website
Meta tags
- Title
- Semantic Versioning 2.0.0 | Semantic Versioning
- Description
- Semantic Versioning spec and website
- Canonical
- https://semver.org/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
No technologies detected.
Hosting & CDN
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- semver.org
- Valid from
- Jun 19, 2026
- Valid to
- Sep 17, 2026
- Days until expiry
- 53
- SAN domains
- semver.org, www.semver.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 8 · H3 12
Links
43 internal · 6 external · 0 broken
Images
0 total · 0 missing alt
Scripts / Styles
1 scripts · 1 stylesheets
JS / CSS size
815 B · 3.6 KB
Page size
30.4 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- 100
SEO issues
No SEO issues detected.
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://semver.org
- Final URL
- https://semver.org
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 5 ms
- HTML size
- 30.4 KB
- Redirect chain
- https://semver.org
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does semver.org use?
- We did not detect any specific technologies for semver.org in the latest scan.
- Is semver.org secure (HTTPS)?
- Yes. semver.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 17, 2026.
- Who hosts semver.org?
- semver.org is hosted on Fastly, behind Fastly CDN.
- What is semver.org's SEO score?
- semver.org scored 100/100 for SEO in the latest analysis (excellent).
- What is semver.org's overall website score?
- semver.org has an overall SiteGraph score of 91/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card