• p1mrx
    2·
    1 year ago

    Because 1.2.3.4 and 1.02.003.04 both map to the same number.

    But 10.20.30.40 and 010.020.030.040 map to different numbers. It’s often best to reject IPv4 addresses with leading zeroes to avoid the decimal vs. octal ambiguity.

      • p1mrx
        2·
        1 year ago

        It’s not about how people write them, it’s how parsers parse them. IPv4 has been around since 1982, and most parsers interpret leading zeros as octal.