RFC 7484, "Finding the Authoritative Registration Data (RDAP) Service", March 2015

Note: This RFC has been obsoleted by RFC 9224

Note: This RFC has been updated by RFC 8521

Errata ID: 5460
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Pieter Vandepitte
Date Reported: 2018-08-14
Verifier Name: Murray Kucherawy
Date Verified: 2021-12-02

Section 8 says:

      In the case of a domain object, the client may first query the DNS
      to see if the respective entry has been delegated or if it is
      mistyped information by the user.  The DNS query could be to fetch
      the NS records for the TLD domain.  If the DNS answer is negative,
      then there is no need to fetch the new version of the registry.
      However, if the DNS answer is positive, this may mean that the
      currently cached registry is no longer current.  The client could
      then fetch the registry, parse, and then do the normal matching as
      specified above.  This method may not work for all types of RDAP
      objects.

Notes:

I would remove the whole section. The point is: if the DNS answer is positive, then you need to fetch the registry. But if the answer is negative, this does not mean anything because it it possible that a registered domain is not delegated.

Report New Errata