World university web census · gap lists · Universities with an expired security.txt · the United States · the United States report
Universities with an expired security.txt in the United States
10 universities in the United States (0.4% of the 2,349 in the census list) lack security.txt Expires line (RFC 9116) as of 2026-09-30. Who buys this: Security teams and vulnerability-disclosure vendors: a lapsed file is a specific, verifiable conversation opener..
A security.txt is published but its Expires date has passed; RFC 9116 says a file past that date should not be relied on.
Free sample: 10 of 10
| Domain | Name | Country | City |
|---|---|---|---|
| hilo.hawaii.edu | University of Hawaii at Hilo | United States | |
| lccc.wy.edu | Laramie County Community College | United States | |
| princeton.edu | Princeton University | United States | |
| pvamu.edu | Prairie View A&M University | United States | |
| tamu.edu | Texas A&M University - College Station | United States | |
| tcc.fl.edu | Tallahassee Community College | United States | |
| unk.edu | University of Nebraska, Kearney | United States | |
| unl.edu | University of Nebraska, Lincoln | United States | |
| villanova.edu | Villanova University | United States | |
| westliberty.edu | West Virginia University at Parkersburg | United States |
Get the the United States file and more
- the United States only, 10 rows: 0.25 USDC.
GET https://universities.agentexchange.work/leads/expired-security-txt/state/US.csv - The whole list, 61 rows: 1.00 USDC.
GET https://universities.agentexchange.work/leads/expired-security-txt.csv - All 8 gap lists of this census: 5.00 USDC.
GET https://universities.agentexchange.work/leads/all.json
x402 on Base, paid per file, no account or key: the GET answers 402 Payment Required with the terms; an x402 client signs the USDC authorization and resends with X-PAYMENT. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title.
Get told when the United States changes
Free: the Atom feed of universities entering or leaving this list. Paid: a webhook to your https URL after each 6-hourly re-check that moves a domain on or off this list, 1.00 USDC for 30 days: POST https://universities.agentexchange.work/watch with {"callback":"https://…","list":"expired-security-txt"} (x402). Terms.
Other gap lists in the United States
- Universities without an accessibility statement on the homepage: 887 universities
- Universities without a privacy policy link on the homepage: 866 universities
- Universities without a security.txt: 1,859 universities
- Universities without HSTS: 943 universities
- Universities blocking both ChatGPT-User and Claude-User: 12 universities
- Universities answering only over plain HTTP: 50 universities
- University homepages that redirect to another domain: 61 universities
Other countries on this list
Switzerland (7) · the United Kingdom (5) · Sweden (5) · Germany (4) · Portugal (4) · Canada (3) · Indonesia (3) · the Netherlands (3) · Australia (2) · Finland (2) · France (2) · BA (1) · Brazil (1) · Spain (1) · GU (1) · Ireland (1) · IR (1) · Italy (1) · Norway (1) · PK (1) · PS (1) · TR (1)
Membership reflects the homepage and well-known files as fetched on 2026-09-30. Data licence CC BY 4.0. Not legal advice.