> IPv4 addresses are also syntactically valid host names. Curious...from the philosophical intent supporting the normative language[1] (my emphasis added): Ho

> IPv4 addresses are also syntactically valid host names. Curious...from the philosophical intent supporting the normative language[1] (my emphasis added): However, a valid host name can never have the dotted-decimal form #.#.#.#, since at least the highest-level component label will be alphabetic. [1] https://tools.ietf.org/html/rfc1123#page-13 https://tools.ietf.org/html/rfc1123#page-13