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RL_Quine

They look better in decimal encoding, personally.

http://3509828724/

If you feel sadistic, it's also legal to use octal encoding.

http://0321.0063.0274.0164/

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Rust now outright disallows leading zeroes in IPv4 dotted-decimal due to https://cve.report/CVE-2021-29922

So instead of allowing octal addresses (as I assume the spec allows), they outright disable it?

The IPv4 spec does not mention octal (or hexadecimal) notation at all; allowed forms are purely determined by individual APIS or user interfaces. POSIX `inet_addr` (and non-POSIX `inet_aton`) support nondecimal notation; the more recent POSIX `inet_pton` does not (but supports both IPv4 and IPv6 addresses). Support of oct and hex notation in the older APIs is mostly a historical accident. RFC 6943 recommends only supporting what they call "strict format" in newly written code [1].

[1] https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1

i like to confuse co-workers sometimes by using http://0177.0.0.1 for localhost ^^

Also http://0177.1

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