Public DNS64+NAT64 gateways

If you live in a country with internet censorship and have IPv6 connectivity from ISP, you can use special DNS server (DNS64) which will redirect all IPv4 addresses over IPv4→IPv6 proxy called NAT64.
This allows to access IPv4-only resources via free IPv6 proxy.

I found two public DNS64+NAT64 gateways:

The configuration is trivial: just set up their DNS server as the primary server in the OS network configuration.

Собственно как это помогает обойти блокировки по IP?

It acts like a proxy server.