What powers themastheads.org?
Last seen Aug 2026 · 21 technologies across 12 categories
Appointment scheduling
Acuity Scheduling
since Aug 2023
CDN
Cloudflare
since Aug 2025
Google Hosted Libraries
since Aug 2023
CMS
Ecommerce
Cart Functionality
since Sep 2022
Font scripts
Google Font API
since Oct 2025
Issue trackers
Sentry
since Aug 2023
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
Performance
Priority Hints
since Aug 2025
Programming languages
PHP
since Aug 2023
Security
Cloudflare Bot Management
since Aug 2025
HSTS
since Sep 2022
Webmail
Google Workspace
since Sep 2022
AI Crawlers
Restricts 16 of 33 AI crawlers we track by name in its robots.txt. Checked Oct 2026.
Training crawlers
- AI2Bot Restricted
- Applebot-Extended Restricted
- Bytespider Restricted
- CCBot Restricted
- ClaudeBot Restricted
- cohere-training-data-crawler Restricted
- FacebookBot Restricted
- Google-Extended Restricted
- GoogleOther Restricted
- GPTBot Restricted
- img2dataset Restricted
- meta-externalagent Restricted
- Webzio-Extended Restricted
Search and AI assistants
- Amazonbot Restricted
- DuckAssistBot Restricted
- YouBot Restricted
The other 17 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
16 of 33 AI crawlers restricted
Open Page Rank
2.49 / 10 · ranked #2,509,103 of all domains
18 referring domains · OpenPageRank
Organisation
- The Mastheads
- Founded: 2016
- Country: United States
From Wikidata (CC0).
Infrastructure
- Hosted on Squarespace (198.49.23.144)
- Email: Google Workspace
- Email security: no SPF record, DMARC monitor only
- SSL: Let's Encrypt, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 9,282,423, 2 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted