What powers 
nih.gov?
Last seen Sep 2026 · 302 technologies across 58 categories
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AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Sep 2026. A recent check saw a policy file missing; awaiting confirmation.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Sep 2026 robots.txt appeared
- Sep 2026 * added to robots.txt
- Sep 2026 * removed from robots.txt
- Sep 2026 robots.txt removed
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| health | #2 | 59,600 |
| national h | #4 | 44,400 |
| jay bhattacharya | #2 | 6,600 |
| nih news | #1 | 4,500 |
| national institutes of health clinical center | #2 | 2,900 |
| national library of medicine bethesda | #2 | 2,900 |
| nih directors | #1 | 2,500 |
| nih director | #1 | 2,500 |
| how long does postpartum last | #2 | 2,200 |
| secretary of health and human services | #3 | 2,200 |
| clinical trial and phases | #1 | 2,000 |
| what is nih | #1 | 2,000 |
| erythritol dangers | #1 | 2,000 |
| social health | #2 | 2,000 |
| soluble fiber | #5 | 1,900 |
| nih grant | #2 | 1,800 |
| nih budget | #1 | 1,600 |
| what do mushrooms do to your brain | #1 | 1,500 |
| nih grants | #3 | 1,400 |
| jay bhattacharya | #6 | 1,400 |
| dr francis collins | #3 | 1,300 |
| health literacy | #2 | 1,300 |
| soluble vs insoluble fiber | #5 | 1,300 |
| national institute of health | #1 | 1,200 |
| nih clinical center | #4 | 1,200 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No AI crawlers blocked
Audience
- 49% phone
- 49% desktop
- 2% tablet
United States
Brazil
United Kingdom
Italy
Canada
Australia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
9.44 / 10 · ranked #44 of all domains
212,263 referring domains · OpenPageRank
Search traffic
301,200 est. monthly organic visits (US)
37,339 keywords in Google's top 30
Core Web Vitals
| LCP | 1.1 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- Weight: 1.7 MB · 89 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Similar sites
mo.gov 21 shared
Closest technology stacks among the highest-authority sites we track; "shared" counts the distinctive technologies in common.
Organisation
- United States National Institutes of Health
- Founded: 1887
- Country: United States
From Wikidata (CC0).
Infrastructure
- Registered Oct 1997 (29 years) via get.gov, renews Aug 2027
- Hosted on NIH-NET (156.40.212.210)
- DNS: nih.gov
- Email: nih.gov
- Email security: no SPF record, DMARC reject, DNSSEC signed, CAA
- SSL: IdenTrust, RSA 2048, expires Feb 2027
- Common Crawl link graph: rank 49, 3,079 hosts
- Verified with: Adobe, Amazon SES, Apple Business, Atlassian, Cisco, DocuSign, Google
DNS records as swept Sep 2026, certificate as seen Sep 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| nlmdirector.nlm.nih.gov | 32 |
| crex.nih.gov | 29 |
| obssr.od.nih.gov | 29 |
| dpcpsi.nih.gov | 27 |
| nexus.od.nih.gov | 27 |
| osp.od.nih.gov | 26 |
| hivinfo.nih.gov | 25 |
| pharos.nih.gov | 25 |
| prevention.nih.gov | 25 |
| blog.nimhd.nih.gov | 24 |
| evs.nci.nih.gov | 24 |
| salud.nih.gov | 24 |
| brd.nci.nih.gov | 23 |
| datadiscovery.nlm.nih.gov | 23 |
| datascience.nih.gov | 23 |
| researchmethodsresources.nih.gov | 23 |
| stagetestdomain3.nih.gov | 23 |
| support.nlm.nih.gov | 23 |
| toolkit.ncats.nih.gov | 23 |
| archive.niams.nih.gov | 22 |
| classification.nlm.nih.gov | 22 |
| commonfund.nih.gov | 22 |
| partnersinresearch.nih.gov | 22 |
| registries.ncats.nih.gov | 22 |
Full technology history →
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- detected Turbopack Jul 2026
- dropped Site Kit May 2026
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- detected Site Kit Feb 2026