nih.gov

Mixed

Results vary across nih.gov: of 40 URLs tested, 1 is blocked, 2 are disrupted some of the time, 33 load normally and 4 have no conclusive recent result. The site itself, https://nih.gov, loads normally. The Great Firewall resets the connection. 1,437 tests have been run under this domain since 2011-03-10, the most recent on 2026-07-29.

Connection reset 1

40URLs tested

1blocked

1,437tests all-time

2011first tested

1 d agolast tested

The site itself

http://nih.govNot enough data https://nih.govas of 2026Not blocked http://www.nih.govNot blocked https://www.nih.govas of 2026Not blocked

Pages and subdomains (36)

http://nlm.nih.govNot blocked http://cit.nih.govas of 2025Blocked http://mail.nih.govNot enough data https://mail.nih.govNot enough data http://www.nlm.nih.govas of 2026Not blocked https://ods.od.nih.govNot blocked http://ncbi.nlm.nih.govas of 2026Intermittent https://www.nlm.nih.govas of 2026Not blocked http://www.nhlbi.nih.govNot blocked http://specter.cit.nih.govNot enough data http://www.ncbi.nlm.nih.govas of 2026Not blocked https://www.ncbi.nlm.nih.govNot blocked https://pmc.ncbi.nlm.nih.govas of 2026Not blocked http://eutils.ncbi.nlm.nih.govNot blocked http://www.ncbi.nlm.nih.gov/geoNot blocked https://pubmed.ncbi.nlm.nih.govas of 2026Not blocked https://www.ncbi.nlm.nih.gov/pmcNot blocked https://pubchem.ncbi.nlm.nih.govNot blocked http://www.ncbi.nlm.nih.gov/pubmedas of 2026Not blocked https://www.ncbi.nlm.nih.gov/pubmedas of 2026Not blocked https://pubmed.ncbi.nlm.nih.gov/32408338Not blocked https://pubmed.ncbi.nlm.nih.gov/34417194as of 2026Not blocked https://pubmed.ncbi.nlm.nih.gov/22700766as of 2026Not blocked https://www.ncbi.nlm.nih.gov/pmc/articlesas of 2026Not blocked https://pubmed.ncbi.nlm.nih.gov/25388468/as of 2026Not blocked https://www.ncbi.nlm.nih.gov/books/NBK21535Not blocked https://www.nih.gov/news-events/news-releasesas of 2026Not blocked https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3220305as of 2026Not blocked https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4368388/Not blocked https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10956202Not blocked https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11200532Not blocked https://videocast.nih.gov/pdf/ohrp_appendix_belmont_report_vol_1.pdfas of 2026Intermittent http://www.ninds.nih.gov/disorders/brain_basics/understanding_sleep.htmas of 2026Not blocked https://pmc.ncbi.nlm.nih.gov/articles/PMC11569015/pdf/213_2024_Article_6678.pdfNot blocked https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Understanding-Sleepas of 2026Not blocked https://www.nih.gov/news-events/nih-research-matters/engineering-malaria-resistance-mosquitoesas of 2026Not blocked

About nih.gov and the Great Firewall

Is nih.gov blocked in mainland China?

Results vary across nih.gov: of 40 URLs tested, 1 is blocked, 2 are disrupted some of the time, 33 load normally and 4 have no conclusive recent result. The site itself, https://nih.gov, loads normally. The Great Firewall resets the connection. 1,437 tests have been run under this domain since 2011-03-10, the most recent on 2026-07-29.

How can I reach nih.gov from mainland China?

A VPN or another circumvention tool routes the request outside mainland China, past the filtering that blocks nih.gov. GreatFire runs GreatFire VPN; the Analyzer also tests the domains of many VPN and proxy providers, so you can check whether one is reachable before relying on it.

Elsewhere on the site

nih.gov is ranked #123 among the world's most-visited domains (Tranco).

Sites of similar popularity:app-measurement.com unity3d.com intuit.com forms.gle

Most-blocked .gov domains Every tested URL under nih.gov

Each URL's status is its verdict over the last 90 days, the same one its own page headlines.