Top Level Domains

[phil-news-nospam at ipal.net]

On Tue, 01 Jun 2004 23:37:39 -0400 Kevin Darcy <kcd at daimlerchrysler.com> wrote:

| Gnos Theos wrote:
| 
|>Hello,
|>
|>Does anyone know of a list of TLDs that are 
|>two levels, e.g. .co.uk, or .co.jp ?
|>
| Um, such a thing cannot exist by definition, since a TLD is a 
| *top*-level domain. .co.uk and .co.jp are SLDs (second-level domains) 
| under the .uk and .jp TLDs, respectively.
| 
| Perhaps you mean "a list of SLDs under which domain registration is 
| possible" (???) I'm not aware of any such comprehensive list, but at 
| least with the right terminology you might have more luck finding one...
| 
|                                                                         
|                                                   - Kevin
| 
| P.S. The .us domain accepts registrations under <state>.us, but only 
| from state agencies or departments, so I'm not sure whether you'd want 
| to add those 50 SLDs to your list or not...

Possibly the reason for this request is to implement a means identify a
common authority level.  That is, to strip down a host name to just the
registered name level, and use that for comparison.  The idea I have for
it is to check for proper sender host where SPF data is absent.  Since
you cannot assume an outbound mail server (SMTP client) is listed in the
MX records for the sender's RHS domain, that test isn't reliable.  However,
striping the MX names down to registration authority level, and comparing
that to the similarly stripped down SMTP client reverse name, could lead
to a sufficiently reliable level as to be practical to deploy (it would
not be used in cases where SPF data is present).

What I describe is my own interest in that kind of data.  I really don't
know what the OP wants it for.

-- 
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| Phil Howard KA9WGN       | http://linuxhomepage.com/      http://ham.org/ |
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