Mozilla Comcast This note describes a simple mechanism for determining whether an Internet Service Provider (ISP) network is operating a DNS over HTTPS [RFC8484] server on it for users connected to that network. Discussion Venues This note is to be removed before publishing as an RFC. Source for this draft and an issue tracker can be found at https://github.com/ekr/draft-rescorla-doh-cdisco (https://github.com/ekr/draft-rescorla-doh-cdisco).