- Google Public DNS (8.8.8.8), the default value of Android, Routers and some Linux, [collects information](https://web.archive.org/web/20230618153339/https://developers.google.com/speed/public-dns/privacy) such as queries including requested domain name and IP address.
- Cloudflare (1.1.1.1) also [collects information](https://web.archive.org/web/20230626025054/https://developers.cloudflare.com/1.1.1.1/privacy/public-dns-resolver/) such as queryName and IP. They also categorize them and list data publicly.
| ~~DNS (UDP/TCP)~~ | `53/udp 53/tcp`<br>_Discontinued to promote encryption_ | TCP is rate-limited softly.<br>Port 53 is [unencypted DNS](https://en.wikipedia.org/wiki/Domain_Name_System).<br>You should use encrypted protocol mentioned above if you can. |