RFC 9872 makes recommendations for NAT64 prefix discovery for hosts supporting v4-to-v6 translation. Co-host Nick Buralgio is a co-author of this RFC, so we’re taking the opportunity to talk about it in detail. We discuss the problems RFC 9872 is addressing and why a new RFC was needed for operational guidance, not necessarily defining a protocol or standard. We learn the effects of this RFC on previous RFCs, specifically 7050 and 8781 . Lastly, we share the implications of RFC 9872 on listeners and recommend they do a little labbing to see what this really means for the networks they manage.