On Tue, Oct 8, 2024 at 2:44 AM Alessandro Vesely <[email protected]> wrote:
> Let me repeat the point. Currently there is a dozen alternative regular > expressions (that is, OR joined) which allow various styles of IP > addresses, > and we've been wondering whether 01.02.03.04 is valid (rather than > 1.2.3.4) and > similar trivialities. The original UNIX libc functions that parse IP addresses would accept that. For that matter, so too would "127.1" and "16777343" be accepted without error. But I wouldn't expect any modern standard to be required to accept those. I looked into this and it doesn't appear that a standard was ever published, at least for IPv4. Wikipedia says a document that sought to do that was abandoned long ago (draft-main-ipaddr-text-rep, 2005). RFC 790 had some examples that zero-padded all octets to three digits. It would seem we have some latitude here. -MSK
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