top500.org
Home - | TOP500
Last scanned Jul 26, 2026, 5:17 AM · 2 views
Overall score
Fair
Summary
This website uses Apache hosted on AWS. SEO is fair (55/100) and accessibility is fair (70/100). Security scores good (75/100) and performance good (85/100). Top issue: Missing meta description.
- United States
- Hosted on AWS
Top issues to fix
12 issues found · 4 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.
Over half of images are missing alt text
AccessibilityAdd alt attributes to images — screen readers depend on them, and they help image SEO.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
+6 more issues — details in the sections below.
SEO
7 issue(s) found
Performance
344 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Contact
Email, phone, and address published on this site's own pages.
- info@top500.org
Source: https://top500.org/contact
Meta tags
- Title
- Home - | TOP500
- Description
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- AWS
- CDN provider
- —
- IP address
- 3.125.90.157
- ASN
- AS16509 (AMAZON-02 - Amazon.com, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- top500.org
- Valid from
- May 30, 2026
- Valid to
- Aug 28, 2026
- Days until expiry
- 33
- SAN domains
- top500.org, www.top500.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 6 · H2 6 · H3 0
Links
197 internal · 5 external · 0 broken
Images
1 total · 1 missing alt
Scripts / Styles
21 scripts · 5 stylesheets
JS / CSS size
1.4 MB · 231 KB
Page size
74.7 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing meta description
- Missing canonical link
- Multiple H1 headings found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- Over half of images are missing alt text
Scan details
- Requested URL
- https://top500.org
- Final URL
- https://top500.org
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 343 ms
- HTML size
- 74.7 KB
- Redirect chain
- https://top500.org
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does top500.org use?
- top500.org is built with Bootstrap, jQuery, Google Analytics, Google Ads, Apache.
- Is top500.org secure (HTTPS)?
- Yes. top500.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Aug 28, 2026.
- Who hosts top500.org?
- top500.org is hosted on AWS.
- What is top500.org's SEO score?
- top500.org scored 55/100 for SEO in the latest analysis (fair).
- What is top500.org's overall website score?
- top500.org has an overall SiteGraph score of 71/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card