![]() DoH prevents third-party observers from sniffing traffic and understanding what DNS queries users have run, or what websites users are intending to access. The key difference is DoH takes the DNS query and sends it to a DoH-compatible DNS server (resolver) via an encrypted HTTPS connection on port 443, rather than plaintext on port 53. Both take a domain name that a user types into their browser and sends a query to a DNS server to learn the numerical IP address of the web server hosting that site. Sounds pretty good, right? How does DoH work?ĭoH works just like DNS, except it uses Transmission Control Protocol (TCP) to transmit and receive queries. DoH can increase user privacy and security by preventing eavesdropping and manipulation of DNS data by man-in-the-middle attacks. DoH stands for DNS-over-HTTPS, a standard published by the IETF. So we thought we’d just join the discussion and educate our loyal users on what all the fuss is about.įirst, I’m sure you all know what DoH is - but let’s just spell it out. There is a lot of buzz about DoH right now.
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