clinicaltrials.gov
clinicaltrials.gov is ranked #3,663 in the Tranco list of the world's most popular websites (list of Oct 13, 2026), down 32 places in four weeks. The domain was registered on Feb 3, 2000, 26 years, 8 months ago, through get.gov, and is paid up until Aug 18, 2027. Its homepage uses Google Fonts. It is served by Envoy.
Popularity rank
#3,663 of the top 1 million sites in the Tranco research ranking, which averages several traffic and DNS sources over 30 days. Best rank in the period shown: #3,550.
Domain registration
- Registered
- Feb 3, 2000 (26 years, 8 months ago)
- Expires
- Aug 18, 2027
- Registrar
- get.gov
- Name servers
ns-cloud-d1.googledomains.com,ns-cloud-d2.googledomains.com,ns-cloud-d3.googledomains.com,ns-cloud-d4.googledomains.com- DNSSEC
- Signed
From the registry's public RDAP record, checked Oct 1, 2026.
Technology stack
Detected from the homepage HTML and response headers on Oct 14, 2026. Tools loaded only after scripts run (or after consent banners) may be missing.
Homepage SEO check
Checked from the HTML our scanner received on Oct 14, 2026. Content added later by JavaScript isn't counted.
12 passed · 6 warnings · 4 failed
Content
- ✓Title18 characters
- ✕Meta descriptionMissing
- ✕H1 headingMissing in the served HTML
- !SubheadingsNo H2 headings in the served HTML
- iImage alt textNo images in the served HTML
- ✕Content lengthAbout 22 words in the served HTML
Indexing
- ✓IndexableNo noindex directive
- !Canonical URLMissing
- ✓robots.txtFound
- ✓XML sitemapFound
- ✓Language attributeen
- !Structured dataNo JSON-LD or microdata
Social sharing
- ✕Open GraphMissing
- ✓Twitter / X cardsummary
Technical
- ✓HTTPSServed over HTTPS
- ✓Mobile viewportFound
- ✓FaviconFound
- ✓Character encodingUTF-8
Security headers
- ✓Strict-Transport-SecuritySet
- !Content-Security-PolicyNot set
- ✓Clickjacking protectionSet
- !X-Content-Type-OptionsNot set
- !Referrer-PolicyNot set
Server response
- Final URL
https://clinicaltrials.gov/- HTTP status
- 200
- Server
istio-envoy- Response time
- 1.24 s (first byte 1.24 s, from our scanner in a US data centre)
- HTML size
- 92 KB
- Compression
- gzip
Sites ranked near clinicaltrials.gov
| Rank | Website | Registered |
|---|---|---|
| #3,658 | immobilienscout24.de | — |
| #3,659 | arbeitsagentur.de | — |
| #3,660 | awsdns-01.com | 2010 |
| #3,661 | samsungcloudcdn.com | 2014 |
| #3,662 | fivecdm.com | 2014 |
| #3,664 | zimbra.com | 2001 |
| #3,665 | adscale.de | — |
| #3,666 | bb.com.br | 1998 |
| #3,667 | judns.com | 2014 |
| #3,668 | bounceexchange.com | 2010 |
Questions about clinicaltrials.gov
How popular is clinicaltrials.gov?
clinicaltrials.gov is #3,663 worldwide in the Tranco list published Oct 13, 2026.
How old is clinicaltrials.gov?
clinicaltrials.gov was registered on Feb 3, 2000, which makes the domain 26 years, 8 months old.
What is clinicaltrials.gov built with?
We detected Google Fonts and Envoy on its homepage.
Who is the registrar of clinicaltrials.gov?
get.gov, according to the registry's RDAP record.