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What is encrypted SNI?
Server Name Indication (SNI) is the hostname a browser places in the TLS ClientHello. Shared hosting providers use it to select the correct website configuration and certificate when many sites use one IP address. In earlier TLS handshakes, this hostname was sent in cleartext before the rest of the session was protected, so an on-path observer such as an ISP, Wi-Fi operator or intermediary could read it.
Cloudflare announced an experimental, standards-based ESNI deployment in 2018. ESNI encrypted the SNI extension with a public key published through DNS and was described as requiring TLS 1.3 or later. Cloudflare’s announcement was a deployment milestone, not a guarantee that every browser, site or connection used ESNI.
Cloudflare’s historical explainer said its ESNI keys were rotated hourly while recent keys were retained to accommodate DNS caching and replication delays. That describes the implementation in that article; it should not be treated as a current Cloudflare setting.
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Read the original announcement at Cloudflare’s ESNI announcement and the technical explanation at Cloudflare’s encrypted-SNI explainer.
Does Cloudflare encrypt SNI today?
Cloudflare’s current mechanism is ECH, the successor to ESNI. ECH encrypts an entire inner ClientHello under a server public key advertised to the client. The encrypted inner message contains SNI plus other potentially sensitive handshake fields; a visible outer ClientHello remains for routing and compatibility.
In Cloudflare’s deployment, the outer SNI commonly uses cloudflare-ech.com. An observer can therefore identify Cloudflare as the service provider, but cannot necessarily read the participating customer hostname inside the encrypted ClientHello. Cloudflare announced broad ECH availability in 2023, while its current documentation says ECH is on by default for Free zones. Other plans can expose an enable/disable control in the Edge Certificates dashboard. Settings and plan behavior can change, so consult the current Cloudflare ECH documentation.
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What is the difference between ESNI and ECH?
| Characteristic | ESNI | ECH |
|---|---|---|
| Encrypted scope | Encrypts the SNI extension. | Encrypts an inner ClientHello containing SNI and additional handshake fields. |
| Protocol status | Described as an IETF draft in Cloudflare’s 2018 announcement. | Specified by RFC 9849 as an IETF Standards Track document, published March 2026. |
| Visible information | Other ClientHello metadata remained visible; DNS and the destination IP could still disclose the destination. | An outer ClientHello remains visible. DNS and the destination IP can still disclose or narrow the destination, and Cloudflare’s outer name reveals the provider. |
| Cloudflare context | Historical 2018 network deployment. | Current Cloudflare deployment, documented as default for Free zones and configurable for other plans. |
The IETF defines ECH succinctly: “This document describes a mechanism in Transport Layer Security (TLS) for encrypting a ClientHello message under a server public key.” See RFC 9849.
Cloudflare explained the transition from ESNI to ECH in its 2020 technical overview. Encrypting only SNI left other ClientHello fields available for fingerprinting or policy decisions, so the broader inner-ClientHello design became the practical successor.
Can my ISP see what websites I visit if ECH is enabled?
ECH can prevent the ISP from reading the website hostname in the TLS ClientHello, but it does not make browsing anonymous. The remaining signals matter:
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- DNS queries: Plaintext DNS can expose the hostname before the TLS connection starts. Encrypted DNS such as DNS over HTTPS (DoH) or DNS over TLS (DoT) protects the query in transit to the chosen resolver, but it is separate from ECH.
- Destination IP address: The connected IP remains visible to a network observer. If an address is dedicated to one site, it may identify that site; shared hosting makes attribution less certain.
- Provider identity: With Cloudflare’s deployment, the outer name
cloudflare-ech.comcan show that the connection is going to Cloudflare. - Traffic metadata: Timing, volume and connection patterns are not automatically hidden by ECH.
RFC 9849 explicitly cautions that ECH alone cannot conceal a target when plaintext DNS or a visible server IP reveals it. ECH is therefore one layer in a privacy design, not a replacement for encrypted DNS, careful network architecture or anonymity tools.
How ECH is deployed
Shared mode
In shared mode, the provider is the origin-facing service and terminates TLS for the protected sites. Consistent externally visible TLS behavior across co-located sites can create an anonymity set: an observer sees the shared outer connection rather than the specific inner hostname.
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Split mode
In split mode, the fronting provider relays traffic to a separate backend TLS terminator. This separates the public-facing ECH service from the system that handles the origin’s TLS session. The topology affects which provider or intermediary can observe connection details, so ECH should be evaluated alongside the operator’s trust model.
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How do I enable ECH on Cloudflare?
For a Cloudflare zone, use the current dashboard behavior documented by Cloudflare:
- Sign in to the Cloudflare dashboard and select the account and zone.
- Open SSL/TLS, then Edge Certificates.
- Locate the ECH setting. Cloudflare documents ECH as enabled by default for Free zones; on other plans, use the available toggle to enable or disable it.
- Allow DNS and HTTPS-record changes to propagate, then test with an ECH-capable browser and resolver. A client without ECH support will use the ordinary TLS path.
Because Cloudflare changes dashboard labels and plan behavior, verify the exact control in the live documentation rather than relying on an old screenshot or tutorial.
Can administrators suppress ECH?
Enterprise and regional network operators that need domain-based filtering can control whether clients receive ECH configuration through their local or recursive DNS resolver. Cloudflare documents approaches that omit ECH parameters from HTTPS resource records or answer HTTPS queries so clients cannot obtain them.
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Those interventions are policy controls, not general privacy recommendations. Cloudflare warns that modifying HTTPS records can break DNSSEC-validating clients. Its documentation also describes a canary-domain approach for dealing with browser behavior in some environments. Test changes on the organization’s clients and DNSSEC path before broad deployment.
What ECH does—and does not—promise
- It does: encrypt the inner ClientHello, including the requested hostname, when the client, resolver and server successfully negotiate ECH.
- It does not: hide plaintext DNS queries, the destination IP, Cloudflare’s provider identity in its deployment, or all traffic-analysis signals.
- It does: reduce hostname disclosure on shared infrastructure, where many sites can present the same externally visible behavior.
- It does not: ensure protection on every connection; unsupported clients, blocked ECH configuration and incompatible network policies can force a fallback path.
Bottom line
Cloudflare’s 2018 encrypted-SNI work was the early step; ECH is the current, broader design. It materially reduces hostname exposure in the TLS handshake, and Cloudflare now documents it as a default for Free zones. Pair ECH with encrypted DNS and remember that IP addresses, provider identity and traffic patterns can still reveal useful information.
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