9.9.9.9 [1] has been praised by a bunch of people in the thread from a couple days ago [2]. How do those two compare?
replies(6):
They match your requests with IBM's X-Force threat intelligence database and give you filtered results.
https://www.theregister.co.uk/2017/11/20/quad9_secure_privat...
Is there a service that Quad9 offers that does not have the blocklist or other security?
The primary IP address for Quad9 is 9.9.9.9, which includes the blocklist, DNSSEC validation, and other security features. However, there are alternate IP addresses that the service operates which do not have these security features. These might be useful for testing validation, or to determine if there are false positives in the Quad9 system.
Secure IP: 9.9.9.9 Provides: Security blocklist, DNSSEC, No EDNS Client-Subnet sent. If your DNS software requires a Secondary IP address, please use the secure secondary address of 149.112.112.112
Unsecure IP: 9.9.9.10 Provides: No security blocklist, DNSSEC, sends EDNS Client-Subnet. If your DNS software requires a Secondary IP address, please use the unsecure secondary address of 149.112.112.10
Note: Use only one of these sets of addresses – secure or unsecure. Mixing secure and unsecure IP addresses in your configuration may lead to your system being exposed without the security enhancements, or your privacy data may not be fully protected
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IPV6: https://quad9.net/faq/#Is_there_IPv6_support_for_Quad9
Is there IPv6 support for Quad9?
Yes. Quad9 operates identical services on a set of IPv6 addresses, which are on the same infrastructure as the 9.9.9.9 systems.
Secure IPv6: 2620:fe::fe Blocklist, DNSSEC, No EDNS Client-Subnet
Unsecure IPv6: 2620:fe::10 No blocklist, DNSSEC, send EDNS Client-Subnet