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Open Culture Foundation (OCF), as a partner of the OONI community, supports censorship measurement from a local perspective and shares internet censorship findings with the public.


Open Culture Foundation (OCF), as a partner of the OONI community, supports censorship measurement from a local perspective and shares internet censorship findings with the public.


The OONI project primarily observes whether the network it is located in delivers unexpected browsing content to the end-user through intervention. It provides real-time and publicly available analysis of network censorship observation data.

Internet Tampering

The detection of network intervention situations may occur through the following, but is not limited to, conditions:

  • DNS tampering (DNS anomaly)
  • IP blocking (TCP/IP anomaly)
  • HTTP blocking (e.g block page)
  • TLS based interference (e.g connection reset observed right after the ClientHello message during the TLS handshake)

Research Items

Censorship Measurement with an ASN Coverage Rate Analysis

  • status: ongoing
  • subject: Analyzing OONI's current observational data alongside the known ASN coverage in different regions, to observe whether the data is evenly distributed across various telecommunications or network infrastructures in different areas.
  • methods:
    • Create a local database using the OONI Data Mining (from AWS S3) approach for preliminary comparisons with a global known ASN list.
    • Develop online charts to display observation coverage data in various regions.
    • Establish real-time data integration with OONI Data on the backend.
What is an autonomous system? | What are ASNs?

The Internet is a network of networks*, and autonomous systems are the big networks that make up the Internet. More specifically, an autonomous system (AS) is a large network or group of networks that has a unified routing policy. Every computer or device that connects to the Internet is connected to an AS. More details could refer to "What is an autonomous system? | What are ASNs? | Cloudflare".

Country-specific Test Lists Updated

  • status: in-progress
  • subject: Check if the website list in the TW test list is accessible.
  • methods:
    • Write the scripts or modify the citizenlab/test-lists scripts to support country-specific testing.
    • Check if there are website lists ending with .tw in other regions.
    • Update the list of websites to be included in observation testing.
Test Lists

During the 'Web Connectivity' test phase, OONI utilizes lists maintained by The Citizen Lab globally and regionally. However, the list for TW (Taiwan) was last updated in 2017, and many websites have since shut down or changed their URLs, requiring organization and review.


  • status: in-progress
  • subject: Translations for the web, applications, documents of OONI in zh-tw, zh-hant.
  • methods:
    • Compile a list of OONI-related products and note whether they currently support Traditional Chinese language and how to contribute, include the platform for translation.
    • Review the content that had been translated.
    • Maintain a glossary list for zh-tw and zh-hant.


Q: How to install OONI?

The installation of the desktop or mobile version can refer to the installation instructions on ooni.org. After installation, there is an option to switch to the 'Traditional Chinese' language.

Q: Will OONI observation data leak my IP?

Although OONI observation data is uploaded to the Explorer database, the IP addresses are replaced with the value, and the actual IP is not disclosed.

Q: How to participate in the project and contribute?

You can refer to the research projects of the current initiative on the foundation's GitHub project page at ocftw/ooni-research.

Q: How to continue receiving project updates?

You can join the ooni-research mailing list, and relevant research information will be disseminated through this email address.

Q: How to participate in the internship program?

You can refer to the foundation's 'Internship Bulletin' for information on the internship program and submit your application following the details in the announcement.

Q: Are there any promotional materials available?

You can refer to this approximately 34-page presentation, which provides an overview of OONI and explains the research project.