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IPv4 addresses can be parsed as host names per RFC 1123 section 2.1; it is merely convention ("SHOULD") that dotted numbers are checked as IP addresses before b
by barrkel 7y ago
IPv4 addresses can be parsed as host names per RFC 1123 section 2.1; it is merely convention ("SHOULD") that dotted numbers are checked as IP addresses before being passed through DNS.
This is what the parent meant. IPv4 addresses are also syntactically valid host names.
- metaphor 7y ago> 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
- bluejekyll 7y agoSee also: https://tools.ietf.org/html/rfc2181#section-11 https://tools.ietf.org/html/rfc2181#section-11