5. Reverse Search

This section preserves the RFC text for RDAP RIR search, including rirSearch1, ips, autnums, ipSearchResults, autnumSearchResults, relation links, JSON examples, response behavior, reverse search, conformance, and IANA registrations.

Original RFC Text

5.  Reverse Search

   RDAP reverse search is defined by [RFC9536].  That document limits
   reverse search to domains, nameservers, and entities.  This document
   extends reverse search to cover IP networks and autonomous system
   numbers as well.

   If a server receives a reverse search query with a searchable
   resource type (per the definition of that term in [RFC9536]) of
   "ips", then the reverse search will be performed on the IP network
   objects from its data store.  Similarly, if a server receives a
   reverse search query with a searchable resource type of "autnums",
   then the reverse search will be performed on the autonomous system
   number objects from its data store.

   Additionally, Section 10 notes that new registrations for IP network
   and autonomous system number searches have been made in the "RDAP
   Reverse Search" and "RDAP Reverse Search Mapping" IANA registries.