ctan.org
CTAN: Comprehensive TeX Archive Network
Last scanned Jul 25, 2026, 6:25 AM · 4 views
Overall score
Fair
Summary
This website uses Apache hosted on netcup-AS - netcup GmbH, DE. SEO is fair (65/100) and accessibility is fair (70/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing meta description.
- Austria
- Hosted on netcup-AS - netcup GmbH, DE
Top issues to fix
10 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.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
+4 more issues — details in the sections below.
SEO
5 issue(s) found
Performance
130 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
- webmaster@ctan.org
Meta tags
- Title
- CTAN: Comprehensive TeX Archive Network
- Description
- Canonical
- Language
- en
- Charset
- UTF-8
- Viewport
- width=device-width, initial-scale=1.0
- Robots meta
- Manifest
- https://ctan.org/assets/favicon/manifest-79a60c90526dbf14f7824aa7aa50579f.json
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- netcup-AS - netcup GmbH, DE
- CDN provider
- —
- IP address
- 202.61.224.132
- ASN
- AS197540 (netcup-AS - netcup GmbH, DE)
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
- ctan.org
- Valid from
- Jun 30, 2026
- Valid to
- Sep 28, 2026
- Days until expiry
- 65
- SAN domains
- *.ctan.org, ctan.org
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 1 · H2 10 · H3 0
Links
38 internal · 11 external · 0 broken
Images
1 total · 1 missing alt
Scripts / Styles
5 scripts · 3 stylesheets
JS / CSS size
217 B · 0 B
Page size
18.9 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 6
- 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
- Over half of images are missing alt text
Careers
This company has an active careers page, but individual openings weren't reliably parsed from it — visit the page above for current listings.
Scan details
- Requested URL
- https://ctan.org
- Final URL
- https://ctan.org
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 130 ms
- HTML size
- 18.9 KB
- Redirect chain
- https://ctan.org
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does ctan.org use?
- ctan.org is built with Apache.
- Is ctan.org secure (HTTPS)?
- Yes. ctan.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 28, 2026.
- Who hosts ctan.org?
- ctan.org is hosted on netcup-AS - netcup GmbH, DE.
- What is ctan.org's SEO score?
- ctan.org scored 65/100 for SEO in the latest analysis (fair).
- What is ctan.org's overall website score?
- ctan.org has an overall SiteGraph score of 75/100, combining SEO, performance, security, and accessibility.
- Is ctan.org hiring?
- ctan.org has a careers page; check it directly for current openings.
OpenGraph & Twitter Card
OpenGraph
Twitter Card