What powers 
hfsbooks.com?
Last seen Sep 2026 · 18 technologies across 15 categories
Analytics
Caching
CMS
Databases
Ecommerce
Font scripts
JavaScript libraries
Miscellaneous
Operating systems
Performance
Programming languages
UI frameworks
Web server extensions
Web servers
Widgets
AI Crawlers
Blocks 24 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
- FacebookBot Blocked
- Google-Extended Blocked
- GPTBot Blocked
- ImagesiftBot Blocked
- meta-externalagent Blocked
- Webzio-Extended Blocked
Search and AI assistants
- Amazonbot Blocked
- Claude-SearchBot Blocked
- DuckAssistBot Blocked
- OAI-SearchBot Blocked
- PerplexityBot Blocked
- PetalBot Blocked
- YouBot Blocked
User-request fetchers
- ChatGPT-User Blocked
- Claude-User Blocked
- GoogleAgent-Mariner Blocked
- MistralAI-User Blocked
- Perplexity-User Blocked
The other 9 AI crawlers we track are not mentioned and only inherit the catch-all rules that apply to every crawler.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
24 of 33 AI crawlers blocked
Audience
- 76% desktop
- 24% phone
United States
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.69 / 10 · ranked #337,766 of all domains
179 referring domains · OpenPageRank
Core Web Vitals
| LCP | 4.6 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 4100 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English (United States)
- Weight: 7.1 MB · 159 requests
- WordPress theme: storefront (child: storefront-bibliometa) · all themes
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on Amazon Web Services (34.213.210.202)
- DNS: jhmi.edu
- Email: no MX record returned
- Email security: DNSSEC signed
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 552,252, 2 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Full technology history →
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Recent changes
- detected WordPress Super Cache Jul 2026
- dropped AddToAny Share Buttons Jan 2026
- detected Google PageSpeed Dec 2025