Re: DNS and subdomains

["Dantzig, Brian" <bdantzig () medline com>]

Given "cat.p.dirtside.com", to argue that "p.dirtside.com" is not a domain of which "cat.p.dirtside.com" is a 
sub-domain, is to claim, that “cat.p” is a single token. This is no more true than claiming a series of words with 
spaces can be a single word. It doesn’t matter if I think, want or intend “tooth brush” to be a single word, “tooth 
brush” is two words with a separator <space> between them. Whereas “toothbrush” is a single word. 

 

Regards,

Brian Dantzig

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On Fri, Feb 28, 2025 at 12:50 PM David Conrad <drc () virtualized org> wrote:

On Feb 28, 2025, at 12:18 PM, William Herrin <bill () herrin us> wrote:

> Remember my example cat.p.dirtside.com? P.dirtside.com is a subdomain

> of dirtside.com. It's an administrative grouping of domain names that

> have a particular characteristic. However, p.dirtside.com is NOT a

> domain name. It has no DNS records of its own. Only subsidiaries like

> cat.p.dirtside.com exist and have DNS records.

 

Hmm.

 

I would definitely have said “p.dirtside.com" is a subdomain.

 

Hi Dave,

 

I agree that "p.dirtside.com" is a subdomain. Recheck what I said.

It's not a domain name, no more so than "sdkflkdfgfsgdfg". That's the

contradiction.

 

It gets worse. Is "cat.p.dirtside.com" a subdomain? It's definitely a

domain name. You can know it's a subdomain if you find another domain

name like abc.cat.p.dirtside.com. But if you don't find another name,

how can you as an external observer know that cat.p.dirtside.com is

NOT a subdomain?

 

Regards,

Bill Herrin

 

 

 

-- 

William Herrin

bill () herrin us

https://urldefense.com/v3/__https://bill.herrin.us/__;!!PoMpmxQzTok3!6lM5sB3O-poAPQQVqNKEof81fkrLdAjO1oHmqVLGTfd0N5_kcClVRnKT2bCEceIXwT-gW9rrNlkqtg$

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