What technology does naturalis.nl use?

naturalis.nl is built with jQuery.

Is naturalis.nl secure (HTTPS)?

Yes. naturalis.nl uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 22, 2026.

Who hosts naturalis.nl?

Hosting provider information for naturalis.nl is not available yet.

What is naturalis.nl's SEO score?

naturalis.nl scored 65/100 for SEO in the latest analysis (fair).

What is naturalis.nl's overall website score?

naturalis.nl has an overall SiteGraph score of 85/100, combining SEO, performance, security, and accessibility.

naturalis.nl

Naturalis Biodiversity Center | Museum en onderzoek in Leiden

Last scanned Jul 26, 2026, 11:49 AM

Overall score

Great

Summary

Naturalis Biodiversity Center: voor iedereen die meer wil ontdekken over de rijkdom van de natuur. This website uses jQuery. SEO is fair (65/100) and accessibility is excellent (90/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.

Naturalis Biodiversity Center: voor iedereen die meer wil ontdekken over de rijkdom van de natuur.

Top issues to fix

7 issues found · 2 high priority

Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEO
Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Title longer than 60 characters
SEO
Shorten the title to under 60 characters so search results don't truncate it.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEO
Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

+1 more issue — details in the sections below.

SEO

5 issue(s) found

100

Performance

403 ms

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

Naturalis Biodiversity Center: voor iedereen die meer wil ontdekken over de rijkdom van de natuur.

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Meta tags

Title: Naturalis Biodiversity Center | Museum en onderzoek in Leiden
Description: Naturalis Biodiversity Center: voor iedereen die meer wil ontdekken over de rijkdom van de natuur.
Canonical: https://www.naturalis.nl/
Language: nl
Charset: utf-8
Viewport: width=device-width, initial-scale=1.0
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

jQuery

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: Let's Encrypt
Subject: naturalis.nl
Valid from: Jun 24, 2026
Valid to: Sep 22, 2026
Days until expiry: 55
SAN domains: naturalis.nl, www.naturalis.nl

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyMissing
X-Frame-OptionsEnabled
X-Content-Type-OptionsEnabled
Referrer-PolicyEnabled
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 16 · H3 5

Links

58 internal · 10 external · 20 broken

Images

16 total · 0 missing alt

Scripts / Styles

8 scripts · 2 stylesheets

JS / CSS size

2.2 KB · 0 B

Page size

83.8 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Title longer than 60 characters
No H1 heading found
No structured data (JSON-LD) found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://naturalis.nl
Final URL: https://www.naturalis.nl/
HTTP status: 200
HTTP version: HTTP/2
Response time: 402 ms
HTML size: 83.8 KB
Redirect chain: https://naturalis.nl → https://www.naturalis.nl/

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Frequently asked questions

What technology does naturalis.nl use?: naturalis.nl is built with jQuery.
Is naturalis.nl secure (HTTPS)?: Yes. naturalis.nl uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 22, 2026.
Who hosts naturalis.nl?: Hosting provider information for naturalis.nl is not available yet.
What is naturalis.nl's SEO score?: naturalis.nl scored 65/100 for SEO in the latest analysis (fair).
What is naturalis.nl's overall website score?: naturalis.nl has an overall SiteGraph score of 85/100, combining SEO, performance, security, and accessibility.