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Re: What do people use public suffix for?
From: Geoffrey Keating <geoffk () geoffk org>
Date: 15 Apr 2013 14:34:16 -0700

"John Levine" <johnl () iecc com> writes:

The public suffix list contains points in the DNS where (roughly
speaking) names below that point are under different management from
each other and from that name.  It's here: http://publicsuffix.org/

The idea is that abc.foo.com and xyz.foo.com have the same management,
but abc.co.uk and xyz.co.uk do not.

You don't have to tell me that it's a gross crock, but it seems to
be a useful one.  What do people use it for?
...

CAs use it as part of a procedure to determine whether it's safe to
issue a wildcard domain (as in, if it's on the list, it's not safe).  See
<https://www.cabforum.org/Baseline_Requirements_V1_1_3.pdf>, section 11.1.3.

They'd really like to have a process which is less ad-hoc.  For
example, it'd be great if these points were annotated in the DNS
itself, perhaps with a record which points to the corresponding
whois server.


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