Page History

...

1. Private Resolvers - Found in corporate / restricted networks, not publicly accessible.

2. Shared Private Resolvers - ISPs or similar hosting service providers

3. Closed & and Public Resolvers (not covered) - Commercial DNS filtering / scrubbing service (DNSfilter, OpenDNS, …). Access is determined either by the source IP address or by some other mechanism (TSIG key, TLS certificate). These service providers are typically NOT Internet Service Providers, and the clients sending the queries are located on remote networks.

4. Open & and Public Resolvers (not covered) - In this group we have “fully open” public DNS resolvers such as CloudFlare’s 1.1.1.1, Google 8.8.8.8, Quad9’s 9.9.9.9, etc. All users on the Internet are free to use the service, whether they are stub resolvers (clients) or recursive servers using the open resolver as a forwarding service, with no access restrictions.

3. In the context of KINDNS

• We make recommendations for two categories: “Private resolvers” and “Shared private resolvers”