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I'm not sure exactly what your question is. The example you show is not truly a subdomain. You can type whatever you want before a "@" in the location bar, and only the characters that follow the "@" will be used as the URL.
Example: [microsoft@google.com...]
This does NOT mean that Microsoft now owns Google!
A true subdomain, like red.rubberballs.com, is very different (and not really something I know a lot about). I would just let my web host or server admin set it up for me.
There are community members here who know more about this area than I do. Maybe one of them will come along and help you.
When you're saying [buy@fiat.com...] you're actually mixing protocols, which can't be done.
On the internet, there are different protocols, or addressing systems, that each have a different syntax, or vocabulary - like rules of grammar. It's the same as though you're talking about dogs and birds. Fur is dog protocol, and feathers is bird protocol. You can't mix the two.
http is hypertext transfer protocol, which is part of the vocabulary rules used for addressing web addresses - URLs to connect browsers and web servers.
@ is part of the email protocol, - smtp, which is simple mail transfer protocol, and pop (pop3) - which connects with email, rather than URLs.
Therefore you cannot mix http and @ in any kind of internet addressing.
With some web hosts, you can have [subdomain.domain.com...] set up free of cost, if it's included with your hosting. With other hosts, like the one I use, you have to pay a bit extra to have that set up, and it has to be done by the server administrators. In fact, they assign a unique IP (Internet Protocol) number to the subdomain. Then, the correct way of addressing it would be [subdomain.domain.com...] - no @ is included in the "grammar" rules for this.
AFAIK, the only time @ sign works appropriately in the URL bar is when you are doing an FTP in your browser or you are calling up mail client, Outlook on your Windows machine.
FTP:
ftp://user@mydomain.com
Email:
mailto:somebody@somewhere.com
I do wonder if @ will work in any other instances in the URL line. Any other takers?
Very handy!