What powers 
subsurface-divelog.org?
Last seen Aug 2026 · 14 technologies across 10 categories
CDN
Amazon SES
since Feb 2024
Font scripts
Google Font API
since Aug 2018
JavaScript libraries
Miscellaneous
Open Graph
since Feb 2024
PaaS
Amazon Web Services
since Feb 2024
Programming languages
Python
since Mar 2024
UI frameworks
Web servers
gunicorn
since Mar 2024
Widgets
Ko-fi
since Jan 2024
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Sep 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 59% desktop
- 40% phone
Italy
Germany
France
United States
Spain
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.64 / 10 · ranked #380,258 of all domains
70 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.9 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- Weight: 1.4 MB · 18 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on Hetzner (5.75.216.114, IPv6)
- DNS: Cloudflare DNS
- Email: subsurface-divelog.org
- Email security: SPF (soft fail), DMARC quarantine
- SSL: Let's Encrypt, ECDSA P256, wildcard, expires Nov 2026
- Common Crawl link graph: rank 501,299, 6 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| subsurface-divelog.org | 13 |
| cloud.subsurface-divelog.org | 7 |