# adfree DNS

We run a public privacy-protecting DNS server with advertising, tracker, and malware filtering. The Usable Privacy DNS (updns) service is accessible via the encrypted [DoH](https://en.wikipedia.org/wiki/DNS_over_HTTPS) and [DoT](https://en.wikipedia.org/wiki/DNS_over_TLS) protocols. We use the unified hosts from [StevenBlack](https://github.com/StevenBlack) to filter unwanted domains.

## How to use the Usable Privacy DNS Services

{% content-ref url="updns-services/dns-over-https-doh" %}
[dns-over-https-doh](https://docs.usableprivacy.com/dns/updns-services/dns-over-https-doh)
{% endcontent-ref %}

{% content-ref url="updns-services/dot-dns-over-tls" %}
[dot-dns-over-tls](https://docs.usableprivacy.com/dns/updns-services/dot-dns-over-tls)
{% endcontent-ref %}

## Privacy Policy

1. We do not log client IPs, requested domains or any other personally-identifiable information.
2. We aggregate information on filtered domains and geolocation for user protection.

## Open Source

The [**updns**](https://github.com/usableprivacy/updns) software stack is available under the **BSD 2-Clause License** on GitHub.

### [github.com/usableprivacy](https://github.com/usableprivacy/updns)


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.usableprivacy.com/dns/readme.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.