- Link Authority: 74/100 (very strong, high confidence).
- Web graph rank: #140 of 134,979,706 domains, the top 0.001% of all domains.
- 673,479 linking domains counted in MrKeyword data.
- 3,035 hostnames under nih.gov in the web graph.
- 3rd of 20 government and international bodies on MrKeyword's list.
What is nih.gov's domain authority?
nih.gov has a MrKeyword Link Authority of 74/100, a very strong score. The score comes from where nih.gov sits in MrKeyword's web graph (August–October 2026): it is #140 of 134,979,706 domains by PageRank, and Link Authority places that position on a 0–100 log curve, so the strongest domain scores 100.
This is MrKeyword's own metric, not Moz DA or Ahrefs DR (how the domain authority scores differ); how Link Authority is calculated gives both formulas.
How many websites link to nih.gov?
673,479 different domains link to nih.gov in MrKeyword's data, counting each linking website once however many links it has. That is the number SEO tools call referring domains. The web graph also lists 3,035 hostnames under nih.gov (subdomains such as www or blog count separately).
To see individual linking websites and anchor text, open the free backlink checker for nih.gov.
Which strong websites link to nih.gov?
The strongest linking domain MrKeyword's web graph shows for nih.gov is apple.com, with a Link Authority of 84. The table lists the 10 strongest by their own score.
Strongest domains linking to nih.gov
| Linking domain | Link Authority | Web graph rank |
|---|---|---|
| apple.com | 84 | #20 |
| adobe.com | 80 | #41 |
| amazon.com | 79 | #48 |
| dropbox.com | 75 | #111 |
| bing.com | 71 | #241 |
| atlassian.com | 70 | #294 |
| ahrefs.com | 69 | #311 |
| businessinsider.com | 68 | #394 |
| deloitte.com | 67 | #483 |
| chatgpt.com | 67 | #502 |
7 of the 10 strongest linking domains have a profile on MrKeyword's list too (apple.com, adobe.com, amazon.com, dropbox.com, bing.com, atlassian.com, businessinsider.com). None of them is in nih.gov's own group, government and international bodies.
How does nih.gov compare with similar websites?
nih.gov is 3rd of 20 government and international bodies on MrKeyword's list by Link Authority, with 2 neighbours above it in the table below. The median Link Authority of those 20 government and international bodies is 67, so nih.gov is 7 points above it.
nih.gov and its nearest peers
| Website | Link Authority | Web graph rank | Linking domains |
|---|---|---|---|
| miit.gov.cn | 81 | #33 | 695,218 |
| europa.eu | 79 | #52 | 1,227,455 |
| nih.gov | 74 | #140 | 673,479 |
| who.int | 71 | #226 | 286,740 |
| cdc.gov | 70 | #263 | 332,152 |
See every profiled site on the domain authority list of popular websites, or compare your own site with any of these in the free domain authority checker.
What does a Link Authority of 74 mean?
A Link Authority of 74 is very strong: far ahead of almost every other website. Domains at this level are linked from a very wide spread of other sites; gaining more points usually takes links from other very strong domains. In plain numbers, nih.gov is in the top 0.001% of the 134,979,706 domains in the web graph.
To raise your own site's score, read how to increase domain authority; for the domains at the very top, see the most-linked websites of 2026. The authority list explains why the 0–100 scale is logarithmic.
Where does nih.gov's data come from?
Every number on nih.gov's profile is read from MrKeyword's web graph (August–October 2026). This version uses data imported on 31 October 2026. How MrKeyword collects and labels this data.