We classify servers into four levels based on the security benefits and deployment complexity of TLS/HTTPS-related features,
helping internet users to choose reliable DNS Strict Privacy servers to alleviate the centralization problem
(detailed grading criteria are presented in our paper).
If you need to get DNS-SP server search and recommendation service, please visit our search engine.
   Level-S servers provide the best security protection, and we mark them with green dots on the map.
   Level-A servers provide relatively security protection, and we mark them with blue dots on the map.
   Level-B is the minimum requirement for a server to meet secure transmission, and we mark them with orange dots on the map.
   Level-C servers do not meet the requirements for secure transmission, and we mark them with red dots on the map.