Due to the public announcements from both Chrome and Firefox of their upcoming support for DNS over Https (DoH), I am making available the blocklist that I created to block access to these DoH DNS servers. These public servers pose significant dangers to both commercial and consumer networks, by allowing users using these new browsers to bypass controls that may be in place to limit access to malicious or unwanted sites. This does not count the malware now appearing that uses DoH to bypass network controls and detection.

You can download this file for use by your blocklist enabled firewall at https://heuristicsecurity.com/dohservers.txt

There are no warranties express or implied associated with this file. Use at your own risk and after conducting appropriate testing for your environment. Not responsible for errors or omissions.