this post was submitted on 05 May 2025
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The final piece is that often each of those services would be on a different computer entirely, each with a different public IP address. Otherwise the port is sufficient to sperate most services on a common domain.
There was a good long while where IP addresses were still unutilized enough that there was no reason to even try being conservative.
Originally there also wasn't any name-based virtual hosting, especially in SSL/TLS-based services like HTTPS so you needed one IP per name if you wanted to host multiple websites.
And part of the disappearance of www. now is probably that strange decision by Chrome to hide it.
Chromes decision actually makes a lot of sense, from a security perspective. When we model how people read URLs, they tend to be "lazy" and accept two URLs as equal if they're similar enough. Removing or taking focus away from less critical parts makes users focus more on the part that matters and helps reduce phishing. It's easier to miss problems with https://www.bankotamerica.com/login_new/existing/login_portal.asp?etc=etc&etc=etc than it is with bankotamerica, with the com in a subdued grey and the path and subdomain hidden until you click in the address bar.
It's the same reason why they ended up moving away from the lock icon. Certs are easy to get now, and every piece that matches makes it more likely for a user to skip a warning sign.