DNS over HTTPS (DoH) sends DNS queries and responses over an encrypted HTTPS connection between a device or app and a chosen DNS resolver. It makes those exchanges harder for people on the network path to read or alter, but the resolver still sees the questions it handles. DoH encrypts DNS transport; it does not make browsing anonymous or act as a VPN.
What DNS over HTTPS means
DNS—the Domain Name System—helps a device find the network address associated with a domain name. DoH changes how a DNS query travels to a resolver: instead of sending it through traditional unencrypted DNS transport, the client carries it in an HTTPS exchange. The DNS task remains the same; the transport is different.
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The IETF standard defines a DNS query and its response as an HTTP exchange. The client uses a configured DoH server, which performs the resolver role. The standard does not define how the client discovers or chooses that server; the endpoint is configured separately by a user, software, or network administrator. RFC 8484
How a DoH request works
- The client selects an endpoint. A device, browser, or app must be configured with a DoH resolver address. That choice is outside the DoH protocol itself.
- The client sends a DNS query over HTTPS. RFC 8484 specifies two HTTP methods: GET encodes the DNS message using base64url in a
dnsquery parameter; POST carries the message in the request body with theapplication/dns-messagemedia type. - The resolver answers through the HTTPS exchange. The resolver processes the query and returns a DNS response to the client.
For example, Google Public DNS documents https://dns.google/dns-query as an RFC 8484 endpoint that supports GET and POST. Its separate JSON API at https://dns.google/resolve supports GET only; it is not the same endpoint or wire format as the RFC 8484 DNS-message interface. Google Public DNS DoH documentation
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GET requests may be cached more effectively, while POST requests are less cacheable. Google notes that reduced caching can be desirable for privacy-sensitive applications or browser modes. This is provider guidance, not a guarantee that one method will be faster or more private in every setup; results depend on the client, resolver, network, and caching behavior. Google Public DNS DoH documentation
What DoH protects—and what it does not
HTTPS encrypts the connection between the client and its selected resolver and authenticates the server. This helps prevent passive observers on that network path from reading DNS exchanges and makes some attempts to alter or redirect those exchanges harder. DoH commonly uses HTTPS on port 443, and its traffic can share connections with other HTTPS traffic, which can make it less obvious to simple on-path devices. RFC 8484; Cloudflare DoH documentation
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The resolver is the important boundary: it receives and processes the DNS queries. DoH therefore does not hide those questions from the resolver, guarantee anonymity, encrypt all app traffic, or prevent every form of tracking. HTTP-layer identifiers and request patterns can also create correlation risks, as RFC 8484 discusses in its privacy considerations. RFC 8484
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| Technology | What it does | What it does not do by itself |
|---|---|---|
| DoH | Carries DNS queries and responses over HTTPS, encrypting the client-to-resolver connection. | It does not conceal queries from the resolver or route all internet traffic through a tunnel. |
| DNS over TLS (DoT) | Encrypts DNS transport using TLS rather than carrying DNS inside HTTPS. | It does not make the resolver unable to see the queries it handles. |
| DNSSEC | Helps validate the authenticity of DNS data. | It does not encrypt the connection carrying DNS queries. |
| Oblivious DNS over HTTPS (ODoH) | Uses a proxy-based design intended to keep any single server from knowing both the client’s IP address and the contents of its DNS queries. | It is a distinct protocol design, not a privacy feature automatically provided by ordinary DoH. |
| VPN | A VPN can route internet traffic through a tunnel, depending on its configuration. | DoH alone does not provide a VPN tunnel or encrypt all application traffic. |
DoH and DNSSEC solve different problems and can be used together: DoH protects DNS transport, while DNSSEC validation helps establish the authenticity of DNS data. The IETF describes encrypted DNS transport and DNSSEC as independent and compatible. RFC 8932
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ODoH is described in an IETF Experimental RFC. Its proxying design separates the client’s IP address from the DNS query contents so that no single server is intended to learn both. That is a separate arrangement with different requirements, not a property to assume when using ordinary DoH. RFC 9230
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choosing a DoH resolver
DoH is a protocol, not a single service or a guarantee that every resolver handles data the same way. Before selecting an endpoint, consider:
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- Data handling: Review the resolver operator’s published logging, retention, and privacy practices.
- Filtering: Check whether it offers the blocking or parental-control policies you need.
- Compatibility and availability: Confirm your device, app, and network support the endpoint and that it is reachable where you use it.
- Network policy: A workplace, school, or other managed network may require a particular resolver or apply filtering policies that depend on it.
Resolver examples and protocol features are not performance rankings. Without current, comparable measurements, there is no basis here to name a universally fastest or best resolver. For managed filtering, Cloudflare Gateway illustrates why endpoint choice can matter: its documentation says a browser’s DoH must point to a Gateway DNS location endpoint for the browser’s DNS filtering policies to apply. That is a specific managed-service configuration, not a feature built into DoH itself. Cloudflare DoH documentation
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