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DNS-Names are not bound/specific to a protocol/service type. Of course some might fit better for a serivce, e.g. the top level domain “.im” fits “Instant Messaging” (e.g xmpp, matrix …) services well. But still you could host a Website (https-protocol) on the same address. The list of valid top level domains is not static. new TLDs are being approved constantly. This means e.g. “.world” is a valid Top Level Domain but not many/big services use it for now, so it is rather unknown.
Network “sign-in” webpage?