What is the proper term for (example) hostname.tld:433 (hostname:portnumber)?
It is not just hostname, and it is not really a URL either :) same goes for 10.0.0.1:3306 etc.
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IP address and port pair is called, Socket Address
Pair of socket addresses (10.0.0.1:123, 192.168.0.1:123) may also be called 4-tuple or 5-tuple if the protocol is specified as well (10.0.0.1:123, 192.168.0.1:123 UDP)
I've been writing a lot of network code over the years, and the word "endpoint" seems to be the term for "a specific port on a specific IP address".
Have a look at the Boost documentation as well as the Microsoft documentation:
According to the DOM/Web API it is simply
The host property of the URL interface is [...] the hostname, and then, if the port of the URL is nonempty, a ':', and the port of the URL.
You can see this in a browser console:
url = new URL('http://example:8080/path') url.hostname // "example" url.host // "example:8080"
If your use case covers the optional 'authentication' section, then this would be called an "authority".
[A URI] comprises:
An authority part, comprising:
- An optional authentication section of a user name and password, separated by a colon, followed by an at symbol (@)
- A "host", consisting of either a registered name (including but not limited to a hostname), or an IP address. IPv4 addresses must be in dot-decimal notation, and IPv6 addresses must be enclosed in brackets ([ ]).
- An optional port number, separated from the hostname by a colon
It is formalized in RFC 3986 - Uniform Resource Identifier (URI): Generic Syntax
The authority component is preceded by a double slash ("//") and is terminated by the next slash ("/"), question mark ("?"), or number sign ("#") character, or by the end of the URI.
authority = [ userinfo "@" ] host [ ":" port ]