Visualizations - Censored Planet

Global number of vantage points from all tools

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For every country, how many vantage points (DNS resolvers, echo servers, discard servers, HTTP servers and HTTPS servers) do we have? To calculate this, we take our list of filtered resolvers and vantage points and geolocate them using MaxMind.




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Number of echo server vantage points by country

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For every country, how many vantage points (echo servers) do we locate? To calculate this, we take our list of filtered servers and geolocate them using MaxMind. We show both the number of potential servers in the country and the number of servers we use in our measurement, because some of them don't pass our preliminary tests or do not stay alive until the end of our measurement.




Number of discard server vantage points by country

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For every country, how many vantage points (discard servers) do we locate? To calculate this, we take our list of filtered servers and geolocate them using MaxMind. We show both the number of potential servers in the country and the number of servers we use in our measurement, because some of them don't pass our preliminary tests or do not stay alive until the end of our measurement.




Number of HTTP server vantage points by country

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For every country, how many vantage points (HTTP servers) do we locate? To calculate this, we take our list of filtered servers and geolocate them using MaxMind. We show both the number of potential servers in the country and the number of servers we use in our measurement, because some of them don't pass our preliminary tests or do not stay alive until the end of our measurement.




Number of HTTPS server vantage points by country

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For every country, how many vantage points (HTTPS servers) do we locate? To calculate this, we take our list of filtered servers and geolocate them using MaxMind. We show both the number of potential servers in the country and the number of servers we use in our measurement, because some of them don't pass our preliminary tests or do not stay alive until the end of our measurement.




Satellite is a tool to detect DNS interference remotely, scalably, ethically, and globally. We begin by identifying open DNS resolvers in the IPv4 space and filtering it to rigorous ethical standards, utilizing only about 10,000 of 10,000,000 resolvers (0.1%) spanning 170 countries. We use the latest Alexa top 1K and Citizen Lab global test list as our input domains, and query every resolver with every domain. Using multiple heuristics to avoid false positives, such as AS number, HTTP static content hash, and X.509 certificate trust, we compare with answers from designated control resolvers to determine the occurrence of interference. The following visualizations showcase a small subset of conclusions that can be made from Satellite, and more can be gleaned from our raw historical data.



Percentage of resolvers facing interference by country