si.edu
Just a moment...
Last scanned Jul 18, 2026, 8:49 PM
Overall score
Great
Top issues to fix
8 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 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.
Missing OpenGraph tags
SEOAdd og:title/og:description/og:image so shared links render a proper preview card.
+2 more issues — details in the sections below.
Summary
This website is hosted on Cloudflare. SEO is fair (65/100) and accessibility is excellent (100/100). Security scores good (80/100) and performance excellent (100/100). Top issue: Missing meta description.
SEO
5 issue(s) found
Performance
313 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Meta tags
- Title
- Just a moment...
- Description
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
No technologies detected.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 104.18.1.107
- 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
- www.si.edu
- Valid from
- Jul 16, 2026
- Valid to
- Oct 14, 2026
- Days until expiry
- 87
- SAN domains
- www.si.edu
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyEnabled
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 1 · H3 0
Links
2 internal · 0 external · 2 broken
Images
1 total · 0 missing alt
Scripts / Styles
4 scripts · 0 stylesheets
JS / CSS size
310 KB · 3.1 KB
Page size
45.3 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 44
- 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://si.edu
- Final URL
- https://www.si.edu/
- HTTP status
- 403
- HTTP version
- HTTP/2
- Response time
- 313 ms
- HTML size
- 45.3 KB
- Redirect chain
- https://si.edu → https://www.si.edu/
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Frequently asked questions
- What technology does si.edu use?
- We did not detect any specific technologies for si.edu in the latest scan.
- Is si.edu secure (HTTPS)?
- Yes. si.edu uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 14, 2026.
- Who hosts si.edu?
- si.edu is hosted on Cloudflare, behind Cloudflare CDN.
- What is si.edu's SEO score?
- si.edu scored 65/100 for SEO in the latest analysis (fair).
- What is si.edu's overall website score?
- si.edu has an overall SiteGraph score of 85/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card