What powers jeffser.com?
Last seen Sep 2026 · 8 technologies across 6 categories
Analytics
Caching
CDN
Miscellaneous
PaaS
UI frameworks
AI Crawlers
Blocks 13 of 33 AI crawlers we track by name in its robots.txt. Checked Oct 2026.
Training crawlers
- Applebot-Extended Blocked
- Bytespider Blocked
- CCBot Blocked
- ClaudeBot Blocked
- cohere-training-data-crawler Blocked
- Diffbot Blocked
- Google-CloudVertexBot Blocked
- Google-Extended Blocked
- GoogleOther Blocked
- GPTBot Blocked
- meta-externalagent Blocked
Search and AI assistants
- Amazonbot Blocked
- PetalBot Blocked
The other 20 AI crawlers we track are not mentioned and stay allowed by default.
- robots.txt found
- llms.txt not found
- ai.txt not found
Content Signals:
search=yes ai-train=no declared in robots.txt
- Oct 2026 claude-web added to robots.txt
- Oct 2026 petalbot added to robots.txt
- Oct 2026 googleother added to robots.txt
- Oct 2026 diffbot added to robots.txt
- Oct 2026 cohere-ai added to robots.txt
- Oct 2026 google-cloudvertexbot added to robots.txt
AI Crawlers
13 of 33 AI crawlers blocked
Standards: Content Signals
Open Page Rank
3.02 / 10 · ranked #1,547,759 of all domains
28 referring domains · OpenPageRank
Page
- CDN: Cloudflare, Fastly
- Weight: 0.1 MB · 11 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on Cloudflare (104.21.84.193, IPv6)
- DNS: Cloudflare DNS
- Email: no MX record returned
- Email security: SPF (hard fail), DMARC reject
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Dec 2026
- Common Crawl link graph: rank 1,151,418
- Verified with: Google
DNS records as swept Aug 2026, certificate as seen Oct 2026. How the web is hosted
Full technology history →
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Recent changes
- detected jsDelivr Apr 2026
- detected Tailwind CSS Apr 2026