cppreference.com
cppreference.com
Last scanned Jul 25, 2026, 8:25 AM · 3 views
Overall score
Great
Summary
This website uses Cloudflare Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is fair (65/100) and accessibility is excellent (100/100). Security scores fair (70/100) and performance excellent (100/100). Top issue: Missing meta description.
- United States
- Hosted on Cloudflare
Top issues to fix
9 issues found · 3 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 meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
+3 more issues — details in the sections below.
SEO
5 issue(s) found
Performance
113 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- cppreference.com
- Description
- Canonical
- Language
- en
- Charset
- UTF-8
- Viewport
- width=1120
- Robots meta
- max-image-preview:standard
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 104.21.57.36
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
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
- cppreference.com
- Valid from
- Jun 13, 2026
- Valid to
- Sep 11, 2026
- Days until expiry
- 48
- SAN domains
- *.cppreference.com, cppreference.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsEnabled
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 0 · H3 0
Links
276 internal · 17 external · 4 broken
Images
1 total · 0 missing alt
Scripts / Styles
7 scripts · 2 stylesheets
JS / CSS size
104 KB · 0 B
Page size
118 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 9
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing meta description
- Missing canonical link
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://cppreference.com
- Final URL
- https://cppreference.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 111 ms
- HTML size
- 118 KB
- Redirect chain
- https://cppreference.com
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does cppreference.com use?
- cppreference.com is built with Cloudflare Analytics.
- Is cppreference.com secure (HTTPS)?
- Yes. cppreference.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 11, 2026.
- Who hosts cppreference.com?
- cppreference.com is hosted on Cloudflare, behind Cloudflare CDN.
- What is cppreference.com's SEO score?
- cppreference.com scored 65/100 for SEO in the latest analysis (fair).
- What is cppreference.com's overall website score?
- cppreference.com has an overall SiteGraph score of 82/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card