What powers 
lup.nl?
Last seen Aug 2026 · 28 technologies across 17 categories
Accessibility
Analytics
CMS
Databases
Ecommerce
Font scripts
Hosting panels
JavaScript libraries
Marketing automation
Miscellaneous
Payment processors
Performance
Programming languages
Security
Web servers
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 Sep 2026.
- robots.txt found
- llms.txt not checked
- ai.txt not checked
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| leiden | #35 | 21 |
| leiden university press | #1 | 9 |
| world history definition | #8 | 6 |
| lup | #20 | 6 |
| 80 years war | #62 | 5 |
| introduction to world history | #4 | 3 |
| association for asian studies | #30 | 2 |
| world history pdf | #18 | 1 |
| world history in pdf | #17 | 1 |
| to be a slave book | #67 | 1 |
| where is leiden | #77 | 1 |
| pdf world history | #23 | 1 |
| max planck institute for evolutionary anthropology leipzig | #89 | 1 |
| benjamin franklin by religious philosophy | #68 | 0 |
| why is world history important | #82 | 0 |
| world history summary | #22 | 0 |
| world history in | #81 | 0 |
| world history definitions | #35 | 0 |
| world history books pdf | #30 | 0 |
| xi jinping: governance of china pdf | #79 | 0 |
| xi jinping governance of china pdf | #82 | 0 |
| burton farbman net worth | #29 | 0 |
| buddhism in indonesia | #17 | 0 |
| capitalism in singapore | #42 | 0 |
| colonial tourism | #33 | 0 |
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
- 67% desktop
- 33% phone
Netherlands
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.47 / 10 · ranked #162,868 of all domains
115 referring domains · OpenPageRank
Search traffic
58 est. monthly organic visits (US)
92 keywords in Google's top 30
Core Web Vitals
| LCP | 3.2 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 2000 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English (United States)
- Weight: 4.2 MB · 125 requests
- WordPress theme: hello-elementor (child: hello-theme-child-master) · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- Leiden University Press (Leiden University Press (LUP) on Wikidata)
- Country: Netherlands
From the homepage's own structured data (Sep 2026) and Wikidata (CC0).
Infrastructure
- Hosted on IONOS (217.154.251.202, IPv6)
- DNS: TransIP
- Email: TransIP
- Email security: SPF (soft fail), DMARC quarantine, DNSSEC signed
- SSL: Let's Encrypt, RSA 2048, expires Oct 2026
- Common Crawl link graph: rank 680,340, 2 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| lup.nl | 27 |
| www.lup.nl | 25 |
Full technology history →
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Recent changes
- detected Twitter Emoji (Twemoji) Apr 2026