operaballet.nl
Welkom! | Nationale Opera & Ballet
Last scanned Aug 24, 2026, 1:22 PM · 1 view
Overall score
Excellent
Summary
Van grote klassiekers tot nieuwe producties: de kaartverkoop voor de eerste helft van seizoen 2026 – 2027 is gestart. This website uses Nginx. SEO is good (80/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: No structured data (JSON-LD) found.
Van grote klassiekers tot nieuwe producties: de kaartverkoop voor de eerste helft van seizoen 2026 – 2027 is gestart.
Top issues to fix
6 issues found · 1 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
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.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
17 broken links on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
3 issue(s) found
Performance
287 ms
Security
HTTPS & header checks
Accessibility
0 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.
Meta tags
- Title
- Welkom! | Nationale Opera & Ballet
- Description
- Van grote klassiekers tot nieuwe producties: de kaartverkoop voor de eerste helft van seizoen 2026 – 2027 is gestart.
- Canonical
- https://www.operaballet.nl/
- Language
- nl
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0
- Robots meta
- Manifest
- https://www.operaballet.nl/themes/nob_theme/favicons/site.webmanifest?v=2
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- —
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Sectigo Limited
- Subject
- *.operaballet.nl
- Valid from
- Feb 2, 2026
- Valid to
- Feb 21, 2027
- Days until expiry
- 180
- SAN domains
- *.operaballet.nl, operaballet.nl
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyEnabled
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 1 · H2 9 · H3 13
Links
85 internal · 44 external · 17 broken
Images
63 total · 0 missing alt
Scripts / Styles
16 scripts · 1 stylesheets
JS / CSS size
1.0 KB · 393 B
Page size
153 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://operaballet.nl
- Final URL
- https://www.operaballet.nl/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 284 ms
- HTML size
- 153 KB
- Redirect chain
- https://operaballet.nl → https://www.operaballet.nl/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does operaballet.nl use?
- operaballet.nl is built with Drupal, Nginx.
- Is operaballet.nl secure (HTTPS)?
- Yes. operaballet.nl uses TLS 1.3 with a certificate issued by Sectigo Limited, valid until Feb 21, 2027.
- Who hosts operaballet.nl?
- Hosting provider information for operaballet.nl is not available yet.
- What is operaballet.nl's SEO score?
- operaballet.nl scored 80/100 for SEO in the latest analysis (great).
- What is operaballet.nl's overall website score?
- operaballet.nl has an overall SiteGraph score of 92/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card