God. Dammit. This is the second time today I’ve seen www referred to as a subdomain & I’m going to lose my shit.
Does it have an A record? Then it’s a hostname. The use of a domain as a hostname (CNAMEing www to an A record for the domain) still gives me hives.
#GetOffMyLawnhttps://twitter.com/_r00k_/status/1039271145181081600 …
So www is a special case? Where is this defined? I still don't understand what makes "www" a hostname, but "us" a subdomain, in your example.
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The difference is really in the "domain" part of the word subdomain. (sub)domains have hostnames and possibly further subdomains under them. Since www is just and A record without anything under it, it's just a hostname.
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That seems very arbitrary. What if "us" had no records under it, whereas foo.www.example[.]com existed?
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Also, Twitter does terrible things to text it thinks are meant to be links. I wrote www dot us dot example dot com but it came out looking like http://us.example.com with the www hidden because Twitter is stupid.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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