Cloudflare:
one.one.one.one
1dot1dot1dot1.cloudflare-dns.com

CleanBrowsing:
adult-filter-dns.cleanbrowsing.org
family-filter-dns.cleanbrowsing.org
security-filter-dns.cleanbrowsing.org

Digitalcourage:
dns2.digitalcourage.de

Google:
dns.google

Quad9:
dns.quad9.net
