networking - 为什么ip地址127.001路由到127.0.0.1，127.011路由到127.0.0.9？

Question

通过一个意外的拼写错误，我意识到当您尝试访问 IP 地址时 127.0.01它将成功路由到 127.0.0.1 .
玩弄这个，我注意到似乎有某种翻译正在发生。一些例子:

127.001 -> 127.0.0.1

127.002 -> 127.0.0.2

127.011 -> 127.0.0.9

127.111 -> 127.0.0.111

127.1111 -> 127.0.4.87

127.9999 -> 127.0.39.15

这些翻译背后的逻辑是什么？我已经在 MacOS、Linux 和 Windows 上尝试并复制了它。

Answer 1

来自 wikipedia :

When fewer than four numbers are specified in the address in dotted notation, the last value is treated as an integer of as many bytes as are required to fill out the address to four octets. Thus, the address 127.65530 is equivalent to 127.0.255.250.

您可以自己进行计算以进行检查。
例子: 127.9999 = 01111111 . 00000000 00100111 00001111= 127 . 0 . 39 . 15