- Cloud Delivered Enterprise Security by OpenDNS by Cisco
- ICANN DNS Engineering | L-Root DNS and more
- DNS Resolver, 1.1.1.1 by Cloudflare
- OpenNIC Project
- Public DNS | Google Developers by Google
- Quad 9 | Internet Security and Privacy in a Few Easy Steps by IBM
- RFC 7858 – Specification for DNS over Transport Layer Security (TLS)
- DNS Privacy Project Homepage – DNS Privacy Project – DNS Privacy Project