<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);" class="">Folks, </span><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">FYI, Nick Kernan, my Masters student, has deployed a web portal that facilitates the comparison between various DNS resolvers, including ISP-provided and some influential publicly available resolvers (Google’s public DNS, OpenDNS, Quad9, and Cloudflare). The comparison is based on two factors: the latency of DNS resolutions and the latency of <span class="">TCP handshake</span><span class=""> with </span>the CDN edge server selected through a given resolver. The results are based on recurrent monthly measurements from RIPE Atlas probes that have both IPv4 and v6 connectivity, have an ISP-provided resolver available for comparison, and which meet certain requirements regarding probe versions and reliability. You can specify the desired month of measurement, a region of interest, and the CDNs to analyze. You can access Nick’s portal through <a href="https://dns-web-portal.netlify.app/" class="">https://dns-web-portal.netlify.app/</a></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">The details of the methodology are in Nick’s thesis, which awaits some copyright permissions before being made publicly available. In the meantime, Nick (cc’ed) and I would be happy to answer any questions. </div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Regards,</div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">—Misha Rabinovich</div></body></html>