Sometimes—but the headline claim needs an important qualification. HTTPS encrypts the page contents sent between your browser and a website, but it does not automatically encrypt traditional DNS lookups. If your device sends a DNS request in plaintext to a resolver, parties on that network path—including your internet provider in some configurations—may be able to read the requested domain. That does not mean an ISP necessarily sees every site you visit: encrypted DNS, caching, resolver choice, and other connection details affect what is observable.
What HTTPS protects—and what it does not
When you open a website, your device needs the site’s IP address. It usually gets that address by asking a DNS resolver to look up the domain, such as example.com. DNS is the system that translates domain names into network addresses.
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HTTPS encrypts the web traffic carrying page content between your browser and the site. But conventional DNS requests may travel separately in plaintext. A party able to observe those requests on the path to the resolver may learn the domain being looked up, even if it cannot read the HTTPS-protected page or the information you submit.
Cloudflare describes plaintext DNS as visible to parties between a device and its resolver, and says many devices use an ISP-provided resolver by default. That makes provider visibility possible in some network setups, not inevitable on every visit. A cached answer may mean no new lookup is needed; encrypted DNS may protect the request on its way to a resolver; and the resolver receiving it can process the domain request. Cloudflare’s explanation of its public DNS resolver covers the default-resolver and privacy context.
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What your internet provider may be able to observe
If a DNS lookup is sent unencrypted over a connection your ISP carries, the request can be readable on that network path. If the lookup is encrypted, the ISP generally cannot read the DNS query itself from that encrypted exchange, but this does not make all browsing-related metadata invisible. Mozilla notes that some domain names may still be exposed through SNI, a signal used during connection setup. The exposure depends on the connection and should not be generalized to every domain or every modern connection. Mozilla’s DoH FAQ discusses DNS privacy and SNI.
There are distinct parties to consider: the network provider carrying traffic, the DNS resolver answering the lookup, and the website receiving the connection. Encrypting DNS changes which parties along the route can read the request; it does not prevent the selected resolver from seeing the query it must answer. Cloudflare publishes privacy commitments for its resolver, while Mozilla describes policies applicable to its selected resolvers. Those are provider statements, not independent audits of every provider’s practices.
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How encrypted DNS changes the picture
DNS over HTTPS (DoH) and DNS over TLS (DoT) encrypt DNS traffic between your device or application and its chosen resolver. In both cases, the resolver still needs to see the requested domain to return an answer. The practical difference includes how the protected request is transported and which software or device is configured to use it.
| Method | Transport | What the protection covers | Important consideration |
|---|---|---|---|
| DoH | DNS carried inside HTTPS traffic, commonly over port 443. | Encrypts the DNS request between client and resolver. | The resolver can read the query; browser settings and network conditions affect whether DoH is used. |
| DoT | DNS carried inside a TLS-protected TCP connection; Cloudflare documents its service on port 853. | Encrypts the DNS request between client and resolver. | The resolver can read the query; configuration depends on the device or application. |
Cloudflare’s technical pages explain DNS over HTTPS and DNS over TLS. Neither method, on its own, establishes that a resolver keeps no records; check the chosen provider’s privacy policy and the device or app’s actual configuration.
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Check Firefox’s secure DNS setting
Firefox offers protection levels for DNS over HTTPS. The exact labels and behavior can change, and network, VPN, parental-control, or enterprise conditions may affect availability or fallback. Mozilla’s current support documentation explains the options and caveats. See Mozilla’s instructions for Firefox DNS-over-HTTPS protection levels.
- In Firefox, open Settings.
- Choose Privacy & Security.
- Scroll to DNS over HTTPS and review the selected protection level and resolver.
- Choose a level that fits your needs, then confirm that it remains active on the network you use. If your organization or network manages Firefox, some options may be unavailable.
Mozilla describes Default protection as able to use secure DNS when available and to fall back or disable it in certain circumstances. Increased or Custom protection keeps the selected provider active with backup behavior for issues, while Max protection keeps secure DNS active and warns if the secure resolver cannot be used. Read the current Firefox support page before relying on a particular mode, especially on managed or restricted networks. Mozilla’s Firefox DNS-over-HTTPS overview provides additional context.
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DNS privacy is not the same as DNS integrity
DNSSEC and encrypted DNS address different risks. DNSSEC helps verify that DNS responses have not been tampered with in transit; it does not encrypt the requests or responses. DoH and DoT encrypt the transport between client and resolver, but do not themselves make the resolver unable to read the query. Mozilla summarizes this distinction in its DNS over HTTPS FAQ.
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What about Oblivious DoH?
Oblivious DNS over HTTPS (ODoH) uses separate proxy and target roles. The proxy can see the client’s IP address but cannot read the query; the target can read the query but sees the proxy’s IP address instead. The separation depends on the proxy and target not colluding. Cloudflare describes RFC 9230 as experimental and not endorsed by the IETF, so ODoH is a specialized developing approach rather than a universal default. Cloudflare’s ODoH documentation describes the design and its caveat.
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A practical way to think about your browsing privacy
- HTTPS: protects page contents in transit between your browser and the website.
- Plaintext DNS: may expose a domain lookup to parties on the route to the resolver.
- DoH or DoT: encrypts the DNS exchange on that route, while shifting query visibility to the resolver you choose.
- Other metadata: encrypted DNS does not guarantee that no domain clues are observable; Mozilla notes possible SNI exposure.
- Actual behavior: depends on the browser or device setting, fallback rules, caching, resolver, and network policy.
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