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A comment on .su. Parent comment

Re:.su by manjana on Wednesday September 18, 2019 @08:37AM (#21004682)
Perhaps (if you may classify it as exclusive) .arpa which is still in use I think but you cannot register new domains.

There's also .aero which is pretty exclusive: "only those in various categories of air-travel-related entities may register." - https://en.m.wikipedia.org/wiki/List_of_Internet_top-level_d...

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Re:.su by L3viathan on Wednesday September 18, 2019 @09:42AM (#21005321)
.arpa is in use, but only as an internal detail for reverse name resolution (i.e. looking up the PTR record for 1.2.3.4 queries the server 4.3.2.1.in-addr.arpa)
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Re:.su by WorldMaker on Wednesday September 18, 2019 @03:47PM (#21009256)
Which also yields one of the more interesting backronyms of the internet, as .arpa today is understood to mean "Address and Routing Parameter Area" as opposed to the Advanced Research Projects Agency that was involved in the early internet (ARPANET).
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Re:.su by VonGallifrey on Wednesday September 18, 2019 @10:23AM (#21005718)
> There's also .aero which is pretty exclusive

Makes me feel like I belong to an exclusive club, but I think the list of people and companies that have .aero is fairly long.

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