https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7760

            Bug ID: 7760
           Summary: Document aux_tld / util_rb_2tld usage for
                    Mail::SpamAssassin::Plugin::URIDNSBL
           Product: Spamassassin
           Version: 3.4.2
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Documentation
          Assignee: dev@spamassassin.apache.org
          Reporter: be...@birkenwald.de
  Target Milestone: Undefined

The readme of
https://spamassassin.apache.org/full/3.4.x/doc/Mail_SpamAssassin_Plugin_URIDNSBL.html
states

---
An RHSBL zone is one where the domain name is looked up, as a string; e.g. a
URI using the domain foo.com will cause a lookup of foo.com.uriblzone.net. Note
that hostnames are stripped from the domain used in the URIBL lookup, so the
domain foo.bar.com will look up bar.com.uriblzone.net, and foo.bar.co.uk will
look up bar.co.uk.uriblzone.net.
---

However, the algorithm is described nowhere, and it was seemingly
undeterministic (we had weebly.com in the uribl for hosting phishing sites and
it did not match, tcpdump showed it was querying for the full name). It took me
a while to figure out that this is controlled by the RegistrarBoundaries in the
20_aux_tlds.cf ruleset.

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