Custom port?

Did the public resolver service has a custom port that can be used to bypass transparent DNS proxies?

Thanks.

Not that I’m aware of. How about trying DNS over HTTPS (DoH)?

There are not good way to do DNS over HTTPS on the router level. Both OpenWRT or routerOS doesn’t seem to support it.

Take a look at this:

Cloudflare supports DNS over the standard port 53 as well as DNS over TLS 853 in addition to the DoH that @sdayman mentioned.

It also supports DoT, DoSMS and more: https://developers.cloudflare.com/1.1.1.1/fun-stuff/