arthurdejong.org
Arthur de Jong - Software engineer
Last scanned Aug 24, 2026, 1:23 PM
Overall score
Excellent
Summary
This is the website of Arthur de Jong, software engineer, Debian developer and Open Source/Free Software enthusiast. This website uses Apache hosted on CLDIN-NL - Your Hosting B.V., NL. SEO is good (80/100) and accessibility is excellent (90/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: Missing canonical link.
This is the website of Arthur de Jong, software engineer, Debian developer and Open Source/Free Software enthusiast.
- Netherlands
- Hosted on CLDIN-NL - Your Hosting B.V., NL
Top issues to fix
6 issues found
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.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
Missing html lang attribute
AccessibilitySet <html lang="…"> so screen readers pick the right pronunciation rules.
1 broken link on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
3 issue(s) found
Performance
120 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
This is the website of Arthur de Jong, software engineer, Debian developer and Open Source/Free Software enthusiast.
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- Arthur de Jong - Software engineer
- Description
- This is the website of Arthur de Jong, software engineer, Debian developer and Open Source/Free Software enthusiast.
- Canonical
- Language
- Charset
- UTF-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- CLDIN-NL - Your Hosting B.V., NL
- CDN provider
- —
- IP address
- 185.107.212.88
- ASN
- AS48635 (CLDIN-NL - Your Hosting B.V., NL)
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
- arthurdejong.org
- Valid from
- Aug 15, 2026
- Valid to
- Nov 13, 2026
- Days until expiry
- 80
- SAN domains
- arthurdejong.dev, arthurdejong.eu, arthurdejong.org, www.arthurdejong.dev, www.arthurdejong.eu, www.arthurdejong.org
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsMissing
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 0 · H3 2
Links
4 internal · 4 external · 1 broken
Images
1 total · 0 missing alt
Scripts / Styles
0 scripts · 2 stylesheets
JS / CSS size
0 B · 195 KB
Page size
4.0 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 10
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing canonical link
- No structured data (JSON-LD) found
- sitemap.xml not found
Accessibility issues
- Missing <html lang> attribute
Scan details
- Requested URL
- https://arthurdejong.org
- Final URL
- https://arthurdejong.org
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 120 ms
- HTML size
- 4.0 KB
- Redirect chain
- https://arthurdejong.org
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Frequently asked questions
- What technology does arthurdejong.org use?
- arthurdejong.org is built with Bootstrap, Apache.
- Is arthurdejong.org secure (HTTPS)?
- Yes. arthurdejong.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Nov 13, 2026.
- Who hosts arthurdejong.org?
- arthurdejong.org is hosted on CLDIN-NL - Your Hosting B.V., NL.
- What is arthurdejong.org's SEO score?
- arthurdejong.org scored 80/100 for SEO in the latest analysis (great).
- What is arthurdejong.org's overall website score?
- arthurdejong.org has an overall SiteGraph score of 90/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card