Well the IPv4 spec only allows 4 octets, so having 5 or more is impossible. We could fix it by changing the protocol, but at that point it’s more worth it to just migrate to IPv6.

As in a regex or …?

An ipv4 parser would also be sorta difficult.

you have to account for the fact that all the octets can be added to decimal: http://2130706433 (valid 127.0.0.1)

or the fact that octets can be in different formats: http://0x7F.0x0.0x0.0x1 (127.0.0.1)

or the fact that you can mix octet formats: http://0xC0.0250.0.1 (192.168.0.1)

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