What powers 
universiteitleiden.nl?
Last seen Oct 2026 · 120 technologies across 40 categories
A/B Testing
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Analytics
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CMS
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Cookie compliance
Customer data platform
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Hosting
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Miscellaneous
Operating systems
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Rich text editors
RUM
Security
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Tag managers
UI frameworks
User onboarding
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WordPress plugins
WordPress themes
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Nov 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Nov 2026 robots.txt appeared
- Nov 2026 * added to robots.txt
- Oct 2026 * removed from robots.txt
- Oct 2026 robots.txt removed
- Sep 2026 anthropic-ai removed from robots.txt
- Sep 2026 google-extended removed from robots.txt
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| alia alia | #6 | 3,100 |
| leiden university | #1 | 2,500 |
| leiden university netherlands | #1 | 1,800 |
| leiden university | #3 | 790 |
| elio | #65 | 770 |
| netherlands people | #5 | 640 |
| netherlands | #76 | 630 |
| nederland holland | #74 | 630 |
| leiden university netherlands | #3 | 590 |
| greek writing | #52 | 580 |
| dutch people | #7 | 350 |
| university of leiden | #1 | 270 |
| netherlands culture | #3 | 230 |
| dutch culture | #3 | 230 |
| phd | #34 | 230 |
| advanced computer systems | #36 | 230 |
| plexus | #28 | 190 |
| universiteit leiden | #2 | 160 |
| allosteric modulation | #3 | 160 |
| amelie | #61 | 160 |
| the hague | #47 | 130 |
| peace or war | #64 | 130 |
| yuan zhu | #16 | 120 |
| archaeology | #48 | 120 |
| leiden netherlands | #8 | 110 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No AI crawlers blocked
Audience
- 92% desktop
- 7% phone
- 1% tablet
Netherlands
Italy
India
Indonesia
Germany
United Kingdom
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
8.50 / 10 · ranked #2,505 of all domains
5,736 referring domains · OpenPageRank
Search traffic
23,000 est. monthly organic visits (US)
10,604 keywords in Google's top 30
Core Web Vitals
| LCP | 2 s |
| INP | 50 ms |
| CLS | 0.05 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Dutch
- CDN: Amazon CloudFront
- Weight: 2.2 MB · 22 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Similar sites
- createsend1.com 3 shared
grandpalais.fr 4 shared
laestrella.com.pa 3 shareddb.de 4 shared
- acecqa.gov.au 3 shared
mindmup.com 4 shared
createsend.com 3 shared
antwerpen.be 7 shared
Closest technology stacks among the highest-authority sites we track; "shared" counts the distinctive technologies in common.
Organisation
- Leiden University
- Founded: 1575
- Country: Netherlands
From Wikidata (CC0).
Infrastructure
- Registered Feb 2001 (25 years) via team.blue nl B.V.
- Hosted on SURFNET-NL SURF B.V. (132.229.29.70)
- DNS: surfnet.nl
- Email: mx.microsoft
- Email security: SPF (soft fail), DMARC quarantine, DNSSEC signed
- SSL: HARICA, ECDSA P256, expires Apr 2027
- Common Crawl link graph: rank 6,794, 121 hosts
- Verified with: Microsoft Dynamics 365, Google, Meta Business, Microsoft 365
DNS records as swept Nov 2026, certificate as seen Nov 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| dutchrevolt.library.universiteitleiden.nl | 19 |
| scishousing.universiteitleiden.nl | 19 |
| graduatejournal-leap.universiteitleiden.nl | 18 |
| researchwiki.solo.universiteitleiden.nl | 16 |
| studenttheses.universiteitleiden.nl | 15 |
| studiegids.universiteitleiden.nl | 15 |
| teachingsupport.universiteitleiden.nl | 14 |
| www.aqa.universiteitleiden.nl | 14 |
| mijn.universiteitleiden.nl | 13 |
| my.universiteitleiden.nl | 13 |
| www.mentornetwerk.universiteitleiden.nl | 13 |
| upload-studenttheses.universiteitleiden.nl | 12 |
| acquisitions.library.universiteitleiden.nl | 11 |
| finder.library.universiteitleiden.nl | 11 |
| ask-a-librarian.universiteitleiden.nl | 10 |
| careerzone.universiteitleiden.nl | 10 |
| depthoffield.universiteitleiden.nl | 10 |
| mailings.universiteitleiden.nl | 10 |
| vrr.library.universiteitleiden.nl | 10 |
| careers.universiteitleiden.nl | 9 |
| collectionguides.universiteitleiden.nl | 9 |
| onboarding.universiteitleiden.nl | 9 |
| rooster.universiteitleiden.nl | 9 |
| staff-studenttheses.universiteitleiden.nl | 9 |
Full technology history →
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Recent changes
- dropped Jetpack Jul 2026
- detected Svelte Jul 2026
- detected Angular Jun 2026
- detected Ant Design Jun 2026
- detected Next.js Jun 2026
- detected Next.js App Router Jun 2026
- detected Node.js Jun 2026
- detected Turbopack Jun 2026
- detected Zone.js Jun 2026
- dropped D3 Mar 2026
- dropped Handlebars Mar 2026
- dropped WhatsApp Business Chat Jan 2026
- detected Twitter Emoji (Twemoji) Dec 2025