1) This document is Standards Track while the RFC7125 that it obsoletes is Informational. Standards Track seems correct to me. This may not be an issue - simply calling attention to this change in status to be explained perhaps in the Shepherd Write-up down the line?

2) In Sec 1, please check if the paragraph should be updated as below:

This document fixes that problem by removing stale information from the IPFIX registry [IPFIX] and avoiding future conflicts with the authoritative TCP registry [TCP-FLAGS].

3) Sec 3 does not cover all the fields of the IPFIX IANA Table. Notably "Additional Information" field chould have been supplied here instead of being described in IANA Section 4. Perhaps if everything is stated in Sec 3 then the IANA considerations become simpler and clearer?

4) Please consider if the additional text from Security And Privacy Considerations from RFC7125 is required in addition to the reference to the RFC7011. There is discussion related to DDOS in section 1 of the document.