clinicaltrials.gov
Domduck has read clinicaltrials.gov on 7 days across 5 sources, since 2 August 2026. The domain was registered in 2000. Its robots.txt blocks none of the 8 AI crawlers Domduck tracks.
Last checked .
blocked
What changed
7 days of readings- 13 October 2026 (2026-10-13)
- DNSSEC was enabled between 29 September 2026 and 13 October 2026.
- 15 September 2026 (2026-09-15)
- The certificate moved from GoDaddy.com, Inc. to GoDaddy.com between 31 August 2026 and 15 September 2026.
- The certificate was renewed between 31 August 2026 and 15 September 2026 and is valid to 12 March 2027.
Popularity rank
73 days, lower is betterPosition in the Tranco list, a research ranking of the million most popular domains averaged over thirty days so a single day’s traffic spike cannot move it.
AI crawler policy
No llms.txtNo ChatGPT browsing or training
No ChatGPT search surface
No Claude retrieval
No Perplexity citation
Out of Gemini and AI Overviews grounding, Search ranking unaffected
Out of Apple Intelligence training
Out of most open training corpora
Out of TikTok and Doubao
Read from clinicaltrials.gov/robots.txt. “Not named” means the file says nothing about that agent, which is not the same as allowing it: a catch-all rule added later blocks it without anyone deciding to.
What the domain itself says
read directly, not from a vendor- Issuer
- GoDaddy.com
- Valid
- Yes
- Expires
- 2027-03-12
- Protocol
- TLSv1.3
- Names covered
- 2
- A records
- 1
- AAAA records
- 1
- Mail exchangers
- 3
- Nameservers
- ns-cloud-d1.googledomains.com, ns-cloud-d2.googledomains.com, ns-cloud-d3.googledomains.com, ns-cloud-d4.googledomains.com
- DMARC policy
- reject
- Registered
- 2000-02-03
- Registrar
- get.gov
- Registry status
- server transfer prohibited
How clinicaltrials.gov compares to other .gov domains
Questions
- Does clinicaltrials.gov block GPTBot?
- No. clinicaltrials.gov's robots.txt does not disallow GPTBot, though it does not name the agent either.
- Does clinicaltrials.gov publish an llms.txt file?
- No. Domduck found no llms.txt at clinicaltrials.gov.
- When was clinicaltrials.gov registered?
- 3 February 2000, through get.gov.
- Who issues clinicaltrials.gov's certificate?
- GoDaddy.com.
How this page is made
Every number on this page is a measurement Domduck took itself or read from a public source, on a stated date. Nothing here is written by a language model. Where a value has not changed, no sentence is generated about it.
First reading . 5 sources, 7 days with at least one reading. The popularity rank comes from the Tranco list; the registration record from RDAP, which ICANN requires registries to publish. The certificate, the DNS records and the crawler policy are read by Domduck directly from clinicaltrials.gov.