A Worldwide View on the Reachability of Encrypted DNS Services

This is the authors' abstract. We don't add key points for this paper.

To protect user DNS privacy, four DNS over Encryption (DoE) protocols have been proposed, including DNS over TLS (DoT), DNS over HTTPS (DoH), DNS over QUIC (DoQ), and DNS over HTTP/3 (DoH3). Ensuring reachability stands as a prominent prerequisite for the proper functionality of these DoE protocols, driving considerable efforts in this domain. However, existing studies predominantly concentrate on a limited number of DoT/DoH domains or employ a restricted subset of vantage points (VPs).