doi.org
Mixed
Results vary across doi.org: of 8 URLs tested, 1 is blocked, 1 is disrupted some of the time and 6 load normally. The Great Firewall blocks the connection outright and resets the connection. 156 tests have been run under this domain since 2014-04-21, the most recent on 2026-07-29.
The two are filtered by different means — an unencrypted request by the address and keywords it carries in the clear, an encrypted one by the server name in its TLS handshake — so one working while the other does not is normal.
The site itself
http://doi.orgNot blockedhttps://doi.orgIntermittentPages and subdomains (6)
https://doi.org/10.1073/pnas.2425739122as of 2026Not blockedhttps://doi.org/10.1017/S0305741004000116Not blockedhttps://doi.org/10.1017/S0305741000047895as of 2026Not blockedhttp://dx.doi.orgas of 2026Not blockedhttps://dx.doi.orgNot blockedhttp://dx.doi.org/10.2139/ssrn.2411858BlockedAbout doi.org and the Great Firewall
Results vary across doi.org: of 8 URLs tested, 1 is blocked, 1 is disrupted some of the time and 6 load normally. The Great Firewall blocks the connection outright and resets the connection. 156 tests have been run under this domain since 2014-04-21, the most recent on 2026-07-29.
Plain HTTP and HTTPS differ here: http://doi.org is not blocked, https://doi.org is intermittent. The two are filtered by different means — an unencrypted request by the address and keywords it carries in the clear, an encrypted one by the server name in its TLS handshake — so one working while the other does not is normal.
A VPN or another circumvention tool routes the request outside mainland China, past the filtering that blocks doi.org. 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
doi.org is ranked #204 among the world's most-visited domains (Tranco).
Sites of similar popularity:forbes.comozon.rupki.googbbc.com
Each URL's status is its verdict over the last 90 days, the same one its own page headlines.