URLs are used for protocols other than HTTP(S), although it is most common with HTTP(S). Other URI schemes are sometimes used where a URL is needed to make a li

URLs are used for protocols other than HTTP(S), although it is most common with HTTP(S). Other URI schemes are sometimes used where a URL is needed to make a link to something else (such as in a HTML document, or a Gopher menu item that links to something using a protocol which Gopher does not support linking to (HTTP being one of these protocols), or opening local files or other stuff in a web browser, or for some uses in RDF). But I agree that IPv6 makes it messy. (I had my own idea which is version 10 (numbers 7, 8, 9 are unusable) which uses the same format like version 4 but with sixteen octets instead of four, and some other differences too.)