Can you open 21.ubddns.org:81 from mainland China?
Not sure yet.
There isn't enough recent data to reach a verdict.
2015first tested
4 mo agolast tested
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Other tested URLs on ubddns.org
Blocking varies across ubddns.org: 5 blocked vs 1 accessible among tested hosts.
http://ubddns.orgas of 2025Blockedhttp://u2.ubddns.orgUnresolvablehttp://ie.ubddns.orgUnresolvablehttp://88.ubddns.orgUnresolvablehttp://55.ubddns.orgUnresolvablehttp://72.ubddns.orgUnresolvablehttp://21.ubddns.orgNot enough datahttp://86.ubddns.orgUnresolvablehttp://26.ubddns.orgUnresolvablehttp://27.ubddns.orgNot enough datahttp://35.ubddns.orgas of 2024Blockedhttp://77.ubddns.orgNot enough datahttp://87.ubddns.orgUnresolvablehttp://62.ubddns.orgNot enough datahttp://95.ubddns.orgNot enough datahttp://92.ubddns.orgBlockedhttp://75.ubddns.orgNot enough datahttp://882.ubddns.orgNot enough datahttp://399.ubddns.orgNot enough datahttp://86.ubddns.org/vUnresolvablehttp://86.ubddns.org/tUnresolvablehttp://86.ubddns.org/pUnresolvablehttp://86.ubddns.org/fUnresolvablehttp://86.ubddns.org/cUnresolvablehttp://86.ubddns.org/dUnresolvablehttp://86.ubddns.org/hUnresolvablehttp://75.ubddns.org/fNot enough datahttp://u2.ubddns.org:81Unresolvablehttp://55.ubddns.org:81Unresolvablehttp://86.ubddns.org/ttUnresolvablehttp://86.ubddns.org/ffUnresolvablehttp://86.ubddns.org/ddUnresolvablehttp://92.ubddns.org:81Not enough datahttp://75.ubddns.org/ffNot enough datahttp://4safe.ubddns.orgas of 2026Blockedhttps://4safe.ubddns.orgNot blockedhttp://ta-tpe.ubddns.orgNot enough datahttp://86.ubddns.org/readUnresolvablehttp://fylawsh.ubddns.orgUnresolvablehttp://86.ubddns.org:81/tvUnresolvablehttp://352.ubddns.org/go/9Not enough datahttp://375.ubddns.org/go/9Not enough datahttps://kevin38.ubddns.orgNot enough datahttp://86.ubddns.org:81/dayUnresolvablehttp://86.ubddns.org:81/mp4Unresolvablehttp://52.ubddns.org:81/dayNot enough datahttp://57.ubddns.org:81/dayas of 2024Blockedhttp://375.ubddns.org/t/2.htmlNot enough datahttp://75.ubddns.org/go/t5.htmlNot enough datahttp://352.ubddns.org/go/n2.htmlNot enough datahttp://352.ubddns.org/go/t2.htmlNot enough datahttp://375.ubddns.org/go/n2.htmlNot enough datahttp://375.ubddns.org/go/t2.htmlNot enough datahttp://75.ubddns.org/go/ts5.htmlNot enough datahttp://75.ubddns.org/e/index.htmlNot enough datahttp://375.ubddns.org/go/ns2.htmlNot enough datahttp://75.ubddns.org/tv/index.htmlNot enough datahttp://352.ubddns.org/t/index.htmlNot enough datahttp://375.ubddns.org/t/index.htmlNot enough datahttp://352.ubddns.org/tv/index.htmlNot enough datahttp://375.ubddns.org/tv/index.htmlNot enough datahttp://75.ubddns.org:81/e/index.htmlNot enough datahttp://352.ubddns.org/day/index.htmlNot enough datahttp://352.ubddns.org/t/ebook/2.htmlNot enough datahttp://375.ubddns.org/day/index.htmlNot enough datahttp://26.ubddns.org:81/tv/index.htmlUnresolvablehttp://86.ubddns.org?url=http%3A//86.ubddns.orgUnresolvableEach verdict covers the last 90 days of tests, as on that URL's own page.
Frequently asked questions
Is 21.ubddns.org:81 blocked in mainland China right now?
As of the last test on 2026-04-04, 21.ubddns.org:81 is not enough data in mainland China, based on GreatFire's live Great Firewall measurements.
http://21.ubddns.org:81 · JSON