What powers esviewer.com?
Last seen Oct 2026 · 13 technologies across 7 categories
CDN
cdnjs
since Jan 2024
Cloudflare
since Jan 2024
Google Cloud CDN
since Jan 2024
jQuery CDN
since Jan 2024
jsDelivr
since Jan 2024
IaaS
Google Cloud
since Jan 2024
JavaScript libraries
Miscellaneous
HTTP/3
since Jan 2024
Programming languages
Python
since Jan 2024
UI frameworks
Web servers
gunicorn
since Jan 2024
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Oct 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 66% phone
- 34% desktop
United Kingdom
Netherlands
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
1.25 / 10 · ranked #9,269,647 of all domains
7 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.9 s |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: English
- CDN: Google
- Weight: 1.0 MB · 43 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on Google Cloud (34.120.132.125)
- DNS: Google Cloud DNS
- Email: no MX record returned
- Email security: DNSSEC signed
- SSL: Google Trust Services, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 12,908,109, 4 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| erasmusmc.esviewer.com | 13 |
| leidenuniv.esviewer.com | 13 |
| strath.esviewer.com | 13 |