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Open Observatory of Network Interference

A free software, global observation network for detecting censorship, surveillance and traffic manipulation on the internet

How OONI Works

OONI scans TCP, DNS, HTTP and TLS connections for tampering. Some tests work by requesting data over an unencrypted connection and comparing against a known good value. Others check for DNS spoofing, keyword filtering, transparent proxying and website block lists.

Testing methodology

There are risks. Running a probe involves testing connections to websites that may be banned and using tools to attempt circumventing web censorship. It is not designed to protect the privacy of those running probes. Measurements are published and can include IP addresses or other identifying information.

More about the risks

Getting Involved

Join us in IRC #ooni on OFTC or on the mailing list to discuss the project, what you've learned from measurements and ways you can help out.

Source code is available (GitHub mirror). Issues and future plans for OONI can be found in Trac.


To contact the OONI team send an email to contact [AT] Encrypted emails can be sent using the following PGP key:

Key ID:
    4C15 DDA9 96C6 C0CF 48BD 3309 6B29 43F0 0CB1 77B7