What powers 
pressbooks.org?
Last seen Oct 2026 · 7 technologies across 4 categories
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Nov 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
AI Crawlers
No robots.txt, all AI crawlers allowed
Open Page Rank
3.91 / 10 · ranked #640,254 of all domains
52 referring domains · OpenPageRank
Page
- Language: English
- CDN: Netlify
- Weight: 0.2 MB · 15 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Pressbooks
From Wikidata (CC0).
Infrastructure
- Hosted on Amazon Web Services (75.2.60.5)
- DNS: Hover
- Email: no MX record returned
- Email security: SPF (soft fail)
- SSL: Let's Encrypt, ECDSA P256, expires Dec 2026
- Common Crawl link graph: rank 1,142,195, 5 hosts
- Verified with: Google
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted