dynu.com
Mostly blocked
7 of the 8 URLs we have a verdict for under dynu.com are blocked in mainland China; 1 are not. The Great Firewall poisons its DNS, silently drops its packets so requests time out and resets the connection. 594 tests have been run under this domain since 2014-11-17, the most recent on 2026-07-08.
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://dynu.comas of 2026Intermittenthttps://dynu.comas of 2026Blockedhttp://www.dynu.comas of 2026Blockedhttps://www.dynu.comas of 2026BlockedPages and subdomains (12)
http://rge.dynu.comUnresolvablehttp://NS1.DYNU.COMBlockedhttp://api.dynu.comas of 2026Blockedhttp://checkip.dynu.comas of 2026Blockedhttp://246.dynu.com/go/7Unresolvablehttp://abortccp.dynu.comUnresolvablehttp://246.dynu.com/go/51Unresolvablehttp://246.dynu.com/go/zhUnresolvablehttp://0866.dynu.com/go/7Unresolvablehttp://0866.dynu.com/go/51Unresolvablehttp://0866.dynu.com/go/zhUnresolvablehttps://www.dynu.com/zh-CNas of 2026BlockedAbout dynu.com and the Great Firewall
7 of the 8 URLs we have a verdict for under dynu.com are blocked in mainland China; 1 are not. The Great Firewall poisons its DNS, silently drops its packets so requests time out and resets the connection. 594 tests have been run under this domain since 2014-11-17, the most recent on 2026-07-08.
Plain HTTP and HTTPS differ here: http://dynu.com is intermittent, https://dynu.com is 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.
A VPN or another circumvention tool routes the request outside mainland China, past the filtering that blocks dynu.com. 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
Each URL's status is its verdict over the last 90 days, the same one its own page headlines.