0.0.0.0 是有效的 IP 地址吗? [英] Is 0.0.0.0 a valid IP address?

问题描述

0.0.0.0 是有效的 IP 地址吗?我希望我的程序能够将它存储为没有地址正在使用的指示，但如果它实际上有效，这将不起作用.

Is 0.0.0.0 a valid IP address? I want my program to be able to store it as an indication that no address is in use, but this won't work if it's actually valid.

推荐答案

它有效，因为它包含四个八位字节，每个八位字节都在 0 到 255 的范围内.但是，它不能使用作为真实的 IP 地址.

It is valid inasmuch as it contains four octets, each within the range 0 through 255 inclusive. However, it is not usable as a real IP address.

RFC1700 ^(a) 指出 0.0.0.0/8 (0...) 仅作为源地址保留.您可能会遇到看起来您拥有此地址的情况，但这通常是因为尚未为您分配地址(例如，通过 DHCP).

RFC1700 ^(a) states that 0.0.0.0/8 (0.<anything>.<anything>.<anything>) is reserved as a source address only. You can get into situation where it appears you have this address but that's normally because no address has been assigned to you (by DHCP, for example).

另请参阅有关 IPv4 的维基百科条目.

^(a) 虽然这个 RFC 现在被认为已经过时，但它在给定的行为方面仍然是正确的.它的替代品，https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml，仍然有详细说明 0.0.0.0 地址使用的相同文本.

^(a) Although this RFC is now considered obsolete, it is still correct in terms of the given behaviour. Its replacement, https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml, still has the same text detailing use of the 0.0.0.0 address.

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