What powers lenstra.co?
Last seen Oct 2026 · 15 technologies across 13 categories
Analytics
Cloudflare Browser Insights
since Jul 2025
Google Analytics
since Jul 2025
CDN
Cloudflare
since Feb 2024
CMS
Wagtail
since Aug 2024
Amazon SES
since Oct 2026
Font scripts
Google Font API
since Feb 2024
JavaScript libraries
Swiper
since Feb 2024
Miscellaneous
LottieFiles
since Feb 2024
Open Graph
since Feb 2024
PaaS
Amazon Web Services
since Oct 2026
Programming languages
Python
since Aug 2024
Security
HSTS
since Feb 2024
Tag managers
Google Tag Manager
since Jul 2025
Web frameworks
Django
since Aug 2024
Webmail
Microsoft 365
since Feb 2024
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 Oct 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
France
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
1.43 / 10 · ranked #7,133,764 of all domains
2 referring domains · OpenPageRank
Page
- Language: English
- CDN: Cloudflare
- Weight: 0.8 MB · 31 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Lenstra
From the homepage's own structured data (Oct 2026).
Infrastructure
- Hosted on Cloudflare (104.26.14.231, IPv6)
- DNS: Cloudflare DNS
- Email: Microsoft 365
- Email security: SPF (hard fail), DMARC reject
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Jan 2027
- Common Crawl link graph: rank 10,992,790, 3 hosts
- Verified with: Atlassian, Google, Microsoft 365, Slack
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted