Green: Indicates the URL was successfully accessed by both a local connnection as well as through remote computer.
Red: Indicates the URL was successfully accessed by a local connnection but was inaccessible through a remote computer resulting in a "block page" indicating that the web site is blocked.
Orange: Indicates the URL was successfully accessed by a local connnection but was inaccessible through a remote computer returning HTTP response codes 400 and above.
Yellow: Indicates the URL was successfully accessed by a local connnection but was inaccessible through a remote computer as a result of a network connection error.

What is a "block"?

It is prudent to be careful when alleging that particular web sites are censored within a given country. Although testing may indicate that a particular site is filtered, depending on how such filtering is implemented throughout the country various different Internet Service Providers (ISP) may return different test results.

A "block" is an instance in which test results show that remote computers returned at least one "block page" or all-but-one encountered network connection errors or HTTP response codes of 400 and above while a local connection was able to successfully retrieve the requested content. "Block pages" are web pages that explicitly indicate that a particular web site is blocked, and are thus a far more trustworthy indicator that a web site is truly blocked for all users. Network timeouts and HTTP response codes of 400 and above (which indicate that the requested content was inaccessible) do provide a clear-cut reason for the inaccessibility of a web site, although consistent inaccessibility -- despite the fact that a local connection can access the content without problem -- does indicate that the content is deliberatley being blocked.

Methodology & Limitations

In order to enumerate Internet filtering worldwide, researchers use remote computers located in countries that employ content filtering and blocking practices.

However, there are limitations in content filtering and blocking research. The network connection errors indicative of Internet filtering and blocking are identical to normal errors that occur during the course of Internet traffic routing. In other cases, the content filtering software may return a "block page" when filtered content is accessed which has the same HTTP response code received when a web page is successly accessed. Futhermore, the remote computers may return results that are not indicative of overall Internet filtering within a given country.

To ensure accuracy, the HTTP headers of "block pages" are compared with the HTTP headers of accessible content along with the local connection's HTTP headers in order to determine the location at which the content is being filtered. Additionally, all websites are checked locally (from a non-filtered location) and from multiple remote computers (on different Internet Service Providers and national backbone networks where applicable) at multiple time periods.

Complete Results

NOTE: Google's safe search was not 100% effective in screening out all pornographic content and so some of the results below contain pornographic websites.

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