GreatFire

duckdns.org

Mixed

Results vary across duckdns.org: of 181 URLs tested, 63 are blocked, 5 are disrupted some of the time, 15 load normally and 98 have no conclusive recent result. The Great Firewall resets the connection, silently drops its packets so requests time out and poisons its DNS. 4,916 tests have been run under this domain since 2014-07-03, the most recent on 2026-08-08.

Connection reset 36 Timeout / silent drop 26 DNS poisoning 3 TLS handshake failure 1
Plain HTTP and HTTPS differ here: http://duckdns.org is blocked, https://duckdns.org is not blocked.

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.

181URLs tested
63blocked
4,916tests all-time
2014first tested
2 d agolast tested

The site itself

http://duckdns.orgBlockedhttps://duckdns.orgNot blockedhttp://www.duckdns.orgas of 2026Blockedhttps://www.duckdns.orgas of 2026Not blocked

Pages and subdomains (76)

https://duckdns.org/updateas of 2026Not blockedhttp://55.duckdns.orgNot enough datahttp://66.duckdns.orgNot enough datahttp://77.duckdns.orgNot enough datahttp://u2.duckdns.orgNot enough datahttp://e6.duckdns.orgas of 2024Blockedhttp://227.duckdns.orgas of 2024Blockedhttp://329.duckdns.orgNot enough datahttp://332.duckdns.orgNot enough datahttp://336.duckdns.orgas of 2026Blockedhttp://556.duckdns.orgNot enough datahttp://233.duckdns.orgBlockedhttp://357.duckdns.orgas of 2025Blockedhttp://722.duckdns.orgNot enough datahttp://522.duckdns.orgNot enough datahttp://921.duckdns.orgas of 2024Blockedhttp://356.duckdns.orgNot enough datahttp://236.duckdns.orgNot enough datahttp://225.duckdns.orgNot enough datahttp://776.duckdns.orgNot enough datahttp://339.duckdns.orgNot enough datahttp://hui.duckdns.orgNot enough datahttp://yy4.duckdns.orgNot enough datahttp://iok.duckdns.orgas of 2026Blockedhttp://itmc.duckdns.orgNot enough datahttp://66.duckdns.org/fNot enough datahttp://8bit.duckdns.orgBlockedhttps://iok.duckdns.orgNot blockedhttps://hui.duckdns.orgNot enough datahttps://yy4.duckdns.orgUnresolvablehttp://r207.duckdns.orgNot enough datahttp://g4li.duckdns.orgas of 2023Blockedhttp://ionel.duckdns.orgNot enough datahttp://66.duckdns.org/ffNot enough datahttp://77.duckdns.org/tvNot enough datahttp://236.duckdns.org/fNot enough datahttp://k3.duckdns.org/5wNot enough datahttp://leapp.duckdns.orgas of 2026Blockedhttp://78977.duckdns.orgIntermittenthttp://nukia.duckdns.orgBlockedhttps://xeth.duckdns.orgUnresolvablehttp://356.duckdns.org/tvNot enough datahttp://921.duckdns.org/tvas of 2023Blockedhttp://236.duckdns.org/ffNot enough datahttps://ertel.duckdns.orgas of 2025Not blockedhttps://rg13p.duckdns.orgas of 2024Not blockedhttp://chtway.duckdns.orgNot enough datahttp://pigcat.duckdns.orgNot enough datahttp://makblr.duckdns.orgNot enough datahttps://ubwin.duckdns.orgNot enough datahttp://cwcyrix.duckdns.orgNot enough datahttp://gpwheek.duckdns.orgUnresolvablehttp://e7.duckdns.org/go/5as of 2024Blockedhttp://e7.duckdns.org/go/7as of 2024Blockedhttp://jackawu.duckdns.orgNot enough datahttp://krislam.duckdns.orgNot enough datahttp://andypi2.duckdns.orgNot enough datahttp://yanshui.duckdns.orgNot enough datahttps://home27.duckdns.orgas of 2023Not blockedhttp://ruyonet.duckdns.orgas of 2026Blockedhttp://fresnel.duckdns.orgas of 2025Blockedhttps://novpnn.duckdns.orgas of 2025Blockedhttp://blproxy.duckdns.orgNot enough datahttp://jjhenus.duckdns.orgNot enough datahttps://myhome.duckdns.orgNot enough datahttp://h23.duckdns.org/go/2as of 2023Blockedhttp://ssu.duckdns.org/go/7as of 2024Blockedhttp://h23.duckdns.org/go/7Not enough datahttp://ssu.duckdns.org/go/5as of 2024Blockedhttp://h23.duckdns.org/go/5Not enough datahttp://u2.duckdns.org/go/9sNot enough datahttp://u2.duckdns.org/go/3dNot enough datahttp://u2.duckdns.org/go/5vBlockedhttp://ss2.duckdns.org/go/2as of 2024Blockedhttp://ss2.duckdns.org/go/7as of 2024Blockedhttp://ss2.duckdns.org/go/9as of 2024Blocked

Showing 80 of 181 tested URLs under this domain. See them all

About duckdns.org and the Great Firewall

Is duckdns.org blocked in mainland China?

Results vary across duckdns.org: of 181 URLs tested, 63 are blocked, 5 are disrupted some of the time, 15 load normally and 98 have no conclusive recent result. The Great Firewall resets the connection, silently drops its packets so requests time out and poisons its DNS. 4,916 tests have been run under this domain since 2014-07-03, the most recent on 2026-08-08.

Why does http://duckdns.org behave differently from https://duckdns.org?

Plain HTTP and HTTPS differ here: http://duckdns.org is blocked, https://duckdns.org is not blocked. 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.

How can I reach duckdns.org from mainland China?

A VPN or another circumvention tool routes the request outside mainland China, past the filtering that blocks duckdns.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

duckdns.org is ranked #285 among the world's most-visited domains (Tranco).

Sites of similar popularity:mozilla.comhp.comnature.comwww.gov.uk

Most-blocked .org domainsEvery tested URL under duckdns.org

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