On Aug 8, 2022, at 08:08, Christian Huitema <huit...@huitema.net> wrote:

> The name space is "almost" unitary. People deploy things like domain suffix 
> search lists so that users can type "mailserver" and arrive at 
> "mailserver.corp.example.com" -- or something else, depending where they 
> started for.

There are also private, isolated namespaces; namespaces whose attached RDATA 
exists but looks different depending on who is asking (and when); names that 
are blocked in some places but not others; collisions between names; and no 
doubt other sources of incoherence.

There one namespace in the DNS like there is one namespace in IP, which is to 
say there are multiple and many namespaces that are challenging to count or 
characterise with accuracy. 

What the DNS (domain name) and IP (address) namespaces have in common is that 
they look unitary so long as the common intersection of all the namespaces 
appears large to end users. 

We should perhaps remember that the ship has already sailed on there being a 
single DNS namespace and that what we are really concerned with preserving is 
that the illusion that it has not. 


Joe
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