客户端IP地址的最大长度 [英] Max length for client ip address

问题描述

可能重复：

IPv6地址文本表示的最大长度？

您建议使用存储客户端IP地址的数据库列的最大大小？我现在设置为16，但是我可以获得比IPv6更长的IP地址吗？

What would you recommend as the maximum size for a database column storing client ip addresses? I have it set to 16 right now, but could I get an ip address that is longer than that with IPv6, etc?

推荐答案

对于IPv4，您可以避开存储IP地址的4个原始字节（IP地址中的周期之间的每个数字为0-255，即一个字节）。

For IPv4, you could get away with storing the 4 raw bytes of the IP address (each of the numbers between the periods in an IP address are 0-255, i.e., one byte). But then you would have to translate going in and out of the DB and that's messy.

IPv6地址是128位（而不是32位的IPv4地址）。它们通常写成由冒号分隔的8个4位十六进制数字组： 2001：0db8：85a3：0000：0000：8a2e：0370：7334 。 39个字符适用于以此格式存储IPv6地址。

IPv6 addresses are 128 bits (as opposed to 32 bits of IPv4 addresses). They are usually written as 8 groups of 4 hex digits separated by colons: 2001:0db8:85a3:0000:0000:8a2e:0370:7334. 39 characters is appropriate to store IPv6 addresses in this format.

编辑：但是，有一个警告，有关IPv4映射IPv6地址的详细信息，请参阅@ Deepak的答复。 （正确的最大IPv6字符串长度为 45个字符。）

However, there is a caveat, see @Deepak's answer for details about IPv4-mapped IPv6 addresses. (The correct maximum IPv6 string length is 45 characters.)

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