The NSA urges companies to host their own DoH resolvers and avoid sending DNS traffic to third-parties.

Use of the Internet relies on translating domain names (like “nsa.gov”) to Internet Protocoladdresses. This is the job of the Domain Name System (DNS). In the past, DNS lookups were generally unencrypted, since they have to be handled by the network to direct traffic to the right locations. DNSover Hypertext Transfer Protocol over Transport Layer Security (HTTPS), often referred to as DNS over HTTPS (DoH), encrypts DNS requests by using HTTPS to provide privacy, integrity, and “last mile” source authenticationwith a client’s DNS resolver. Itis useful to prevent eavesdropping and manipulationof DNStraffic.While DoH can help protectthe privacy of DNS requests and the integrity of responses, enterprises that use DoH will lose some of the control needed to govern DNS usage within their networksunless they allow only their chosen DoH resolver to be used.Enterprise DNS controlscan prevent numerous threat techniques used by cyber threat actors for initial access, command and control, and exfiltration.