NIST SP 800-81r3: What’s New?

**Executive Summary:** This post summarizes major changes in NIST SP 800-81 Revision 3, highlighting a shorter, strategic focus and new guidance on Protective DNS as a policy enforcement point, encrypted DNS mechanisms (DoT, DoH, DoQ) and their operational implications, and the importance of DNS hygiene; it recommends organizations review the new SP, assess gaps, and consult vendors or solutions architects for implementation.