パブリックDNS

Google

https://developers.google.com/speed/public-dns/docs/using?hl=ja

IPv4

8.8.8.8
8.8.4.4

IPv6

2001:4860:4860::8888
2001:4860:4860::8844

Cloudflare

https://developers.cloudflare.com/1.1.1.1/ip-addresses/

IPv4

1.1.1.1
1.0.0.1

IPv6

2606:4700:4700::1111
2606:4700:4700::1001