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Chinese Firewall Test



Checks whether a site is blocked by the Great Firewall of China. This test checks across a number of servers from various locations in mainland China to determine if access to the site provided is possible from behind the Great Firewall of China.

This test checks for symptoms of DNS poisoning, one of the more common methods used by the Chinese government to block access to websites.
Top 10 tested domains:
   1. facebook.com
   2. wikileaks.ch
   3. youtube.com
   4. twitter.com
   5. google.com
   6. gmail.com
   7. cnn.com
   8. wikipedia.org
   9. dropbox.com
   10. yahoo.com

Domain (e.g. domain.com):

Chinese firewall test results for twitter.com
==============

Expected value of DNS A records:
104.244.42.1


LocationLookup ResultStatus
Beijing 173.252.102.241
fail
Shenzhen 173.252.102.241
fail
Inner Mongolia 173.252.102.241
fail
Heilongjiang Province 173.252.102.241
fail
Yunnan Province173.252.102.241
fail

DNS servers in China returned different IP addresses to those returned by the root servers. This could indicate DNS poisoning by the Great Firewall of China. It could also just indicate the presence of GeoDNS on this domain name.





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