Can you open http://duckdns.org from mainland China?
No.
It's blocked — 100% of the last 1 conclusive tests failed in mainland China.
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.
Frequently asked questions
Is http://duckdns.org blocked in mainland China right now?
As of the last test on 2026-06-24, http://duckdns.org is 100% blocked in mainland China, based on GreatFire's live Great Firewall measurements.
Why is http://duckdns.org blocked in mainland China?
It's blocked — 100% of the last 1 conclusive tests failed in mainland China.
Since when has http://duckdns.org been blocked?
GreatFire has recorded interference with http://duckdns.org from mainland China since 2014-12-06.
How can I access http://duckdns.org from mainland China?
You need a circumvention tool such as a VPN. GreatFireVPN, built by GreatFire, is designed to bypass the Great Firewall and reach sites like duckdns.org.
http://duckdns.org · JSON