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DNS: Add logging information/criteria (#2509)

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Signed-off-by: Daniel Gray <dngray@privacyguides.org>
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@ -15,20 +15,21 @@ Encrypted DNS with third-party servers should only be used to get around basic [
These are our favorite public DNS resolvers based on their privacy and security characteristics, and their worldwide performance. Some of these services offer basic DNS-level blocking of malware or trackers depending on the server you choose, but if you want to be able to see and customize what is blocked you should use a dedicated DNS filtering product instead.
| DNS Provider | Privacy Policy | Protocols | Logging | [ECS](advanced/dns-overview.md#what-is-edns-client-subnet-ecs) | Filtering | Signed Apple Profile |
|---|---|---|---|---|---|---|
| [**AdGuard Public DNS**](https://adguard-dns.io/en/public-dns.html) | [:octicons-link-external-24:](https://adguard.com/en/privacy/dns.html) | Cleartext DoH/3 DoT DoQ DNSCrypt | Some[^1] | Anonymized | Based on server choice. Filter list being used can be found here. [:octicons-link-external-24:](https://github.com/AdguardTeam/AdGuardDNS) | Yes [:octicons-link-external-24:](https://adguard.com/en/blog/encrypted-dns-ios-14.html) |
| [**Cloudflare**](https://developers.cloudflare.com/1.1.1.1/setup) | [:octicons-link-external-24:](https://developers.cloudflare.com/1.1.1.1/privacy/public-dns-resolver) | Cleartext DoH/3 DoT | Some[^2] | No | Based on server choice. | No [:octicons-link-external-24:](https://community.cloudflare.com/t/requesting-1-1-1-1-signed-profiles-for-apple/571846) |
| [**Control D Free DNS**](https://controld.com/free-dns) | [:octicons-link-external-24:](https://controld.com/privacy) | Cleartext DoH/3 DoT DoQ | Optional[^3] | No | Based on server choice. | Yes [:octicons-link-external-24:](https://docs.controld.com/docs/macos-platform) |
| [**dns0.eu**](https://dns0.eu) | [:octicons-link-external-24:](https://dns0.eu/privacy) | Cleartext DoH/3 DoH DoT DoQ | No | Anonymized | Based on server choice. | Yes [:octicons-link-external-24:](https://dns0.eu/zero.dns0.eu.mobileconfig) |
| [**Mullvad**](https://mullvad.net/en/help/dns-over-https-and-dns-over-tls) | [:octicons-link-external-24:](https://mullvad.net/en/help/no-logging-data-policy) | DoH DoT | No[^4] | No | Based on server choice. Filter list being used can be found here. [:octicons-link-external-24:](https://github.com/mullvad/dns-adblock) | Yes [:octicons-link-external-24:](https://mullvad.net/en/blog/profiles-to-configure-our-encrypted-dns-on-apple-devices) |
| [**Quad9**](https://quad9.net) | [:octicons-link-external-24:](https://quad9.net/privacy/policy) | Cleartext DoH DoT DNSCrypt | Some[^5] | Optional | Based on server choice, malware blocking by default. | Yes [:octicons-link-external-24:](https://quad9.net/news/blog/ios-mobile-provisioning-profiles) |
| DNS Provider | Protocols | Logging / Privacy Policy | [ECS](advanced/dns-overview.md#what-is-edns-client-subnet-ecs) | Filtering | Signed Apple Profile |
|---|---|---|---|---|---|
| [**AdGuard Public DNS**](https://adguard-dns.io/en/public-dns.html) | Cleartext DoH/3 DoT DoQ DNSCrypt | Anonymized[^1] | Anonymized | Based on server choice. Filter list being used can be found here. [:octicons-link-external-24:](https://github.com/AdguardTeam/AdGuardDNS) | Yes [:octicons-link-external-24:](https://adguard.com/en/blog/encrypted-dns-ios-14.html) |
| [**Cloudflare**](https://developers.cloudflare.com/1.1.1.1/setup) | Cleartext DoH/3 DoT | Anonymized[^2] | No | Based on server choice. | No [:octicons-link-external-24:](https://community.cloudflare.com/t/requesting-1-1-1-1-signed-profiles-for-apple/571846) |
| [**Control D Free DNS**](https://controld.com/free-dns) | Cleartext DoH/3 DoT DoQ | No[^3] | No | Based on server choice. | Yes [:octicons-link-external-24:](https://docs.controld.com/docs/macos-platform) |
| [**dns0.eu**](https://dns0.eu) | Cleartext DoH/3 DoH DoT DoQ | Anonymized[^4] | Anonymized | Based on server choice. | Yes [:octicons-link-external-24:](https://dns0.eu/zero.dns0.eu.mobileconfig) |
| [**Mullvad**](https://mullvad.net/en/help/dns-over-https-and-dns-over-tls) | DoH DoT | No[^5] | No | Based on server choice. Filter list being used can be found here. [:octicons-link-external-24:](https://github.com/mullvad/dns-adblock) | Yes [:octicons-link-external-24:](https://mullvad.net/en/blog/profiles-to-configure-our-encrypted-dns-on-apple-devices) |
| [**Quad9**](https://quad9.net) | Cleartext DoH DoT DNSCrypt | Anonymized[^6] | Optional | Based on server choice, malware blocking by default. | Yes [:octicons-link-external-24:](https://quad9.net/news/blog/ios-mobile-provisioning-profiles) |
[^1]: AdGuard stores aggregated performance metrics of their DNS servers, namely the number of complete requests to a particular server, the number of blocked requests, and the speed of processing requests. They also keep and store the database of domains requested in within last 24 hours. "We need this information to identify and block new trackers and threats." "We also log how many times this or that tracker has been blocked. We need this information to remove outdated rules from our filters." [https://adguard.com/en/privacy/dns.html](https://adguard.com/en/privacy/dns.html)
[^2]: Cloudflare collects and stores only the limited DNS query data that is sent to the 1.1.1.1 resolver. The 1.1.1.1 resolver service does not log personal data, and the bulk of the limited non-personally identifiable query data is stored only for 25 hours. [https://developers.cloudflare.com/1.1.1.1/privacy/public-dns-resolver/](https://developers.cloudflare.com/1.1.1.1/privacy/public-dns-resolver)
[^3]: Control D only logs for Premium resolvers with custom DNS profiles. Free resolvers do not log data. [https://controld.com/privacy](https://controld.com/privacy)
[^4]: Mullvad's DNS service is available to both subscribers and non-subscribers of Mullvad VPN. Their privacy policy explicitly claims they do not log DNS requests in any way. [https://mullvad.net/en/help/no-logging-data-policy/](https://mullvad.net/en/help/no-logging-data-policy)
[^5]: Quad9 collects some data for the purposes of threat monitoring and response. That data may then be remixed and shared, such as for the purpose of security research. Quad9 does not collect or record IP addresses or other data they deem personally identifiable. [https://quad9.net/privacy/policy](https://quad9.net/privacy/policy)
[^4]: dns0.eu collects some data for their threat intelligence feeds, to monitor for newly registered/observed/active domains and other bulk data. That data is shared with some [partners](https://docs.dns0.eu/data-feeds/introduction) for e.g. security research. They do not collect any Personally Identifiable Information. [https://dns0.eu/privacy](https://dns0.eu/privacy)
[^5]: Mullvad's DNS service is available to both subscribers and non-subscribers of Mullvad VPN. Their privacy policy explicitly claims they do not log DNS requests in any way. [https://mullvad.net/en/help/no-logging-data-policy/](https://mullvad.net/en/help/no-logging-data-policy)
[^6]: Quad9 collects some data for the purposes of threat monitoring and response. That data may then be remixed and shared, such as for the purpose of security research. Quad9 does not collect or record IP addresses or other data they deem personally identifiable. [https://quad9.net/privacy/policy](https://quad9.net/privacy/policy)
## Self-Hosted DNS Filtering
@ -199,9 +200,14 @@ The anonymized DNS feature does [not](advanced/dns-overview.md#why-shouldnt-i-us
**Please note we are not affiliated with any of the projects we recommend.** In addition to [our standard criteria](about/criteria.md), we have developed a clear set of requirements to allow us to provide objective recommendations. We suggest you familiarize yourself with this list before choosing to use a project, and conduct your own research to ensure it's the right choice for you.
### Minimum Requirements
All DNS products must support:
- [DNSSEC](advanced/dns-overview.md#what-is-dnssec).
- [QNAME Minimization](advanced/dns-overview.md#what-is-qname-minimization).
- Anonymize [ECS](advanced/dns-overview.md#what-is-edns-client-subnet-ecs) or disable it by default.
Additionally, all public providers:
- Prefer [anycast](https://en.wikipedia.org/wiki/Anycast#Addressing_methods) support or geo-steering support.
- Must not log any personal data to disk
- As noted in our footnotes, some providers collect query information for example, for purposes like security research, but in that case that data must not be associated with any PII such as IP address, etc.