It's important to note that SURBL should be used with the basic,
"registrar" domain, i.e., the domain name that would be registered
at a registrar. [...]
Better terminology would help- I'm reading the above to mean that
they reduce every name to a second-level domain.
I'm not.
There are plenty of TLDs where registrars register things at levels
other than the second. For example, my own domain
(rodents.montreal.qc.ca) is a regstrar domain in this sense; qc.ca is
nothing.
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