IPv6地址的文本表示的最大长度？ [英] Maximum length of the textual representation of an IPv6 address?

问题描述

我想将PHP中的 $ _ SERVER [REMOTE_ADDR] 返回的数据存储到一个数据库字段中，非常简单的任务，真的。问题是我找不到任何有关IPv6地址的文本表示的最大长度的正确信息，这是网络服务器通过 $ _ SERVER [REMOTE_ADDR ] 。

我不想将文本表示转换为地址通常编码的128位，我只想知道需要多少字符来存储任何解决方案

由 $ _ SERVER [REMOTE_ADDR]

我相信这将是：

8 * 4 + 7 = 39

8组4位数，其中7'：'。

或者，如果您想考虑IPv4隧道功能[ 0000：0000：0000：0000：0000：0000：192.168.0.1]，

（6 * 4 + 5）+ 1 + 4 * 3 + 3）= 29 + 1 + 15 = 45

I want to store the data returned by $_SERVER["REMOTE_ADDR"] in PHP into a DB field, pretty simple task, really. The problem is that I can't find any proper information about the maximum length of the textual representation of an IPv6 address, which is what a webserver provides through $_SERVER["REMOTE_ADDR"].

I'm not interested in converting the textual representation into the 128 bits the address is usually encoded in, I just want to know how many characters maximum are needed to store any IPv6 address returned by $_SERVER["REMOTE_ADDR"].

解决方案

I believe it would be:

8 * 4 + 7 = 39

8 groups of 4 digits with 7 ':' between them.

Or, if you want to take into account the IPv4 tunneling features [0000:0000:0000:0000:0000:0000:192.168.0.1],

(6 * 4 + 5) + 1 + (4 * 3 + 3) = 29 + 1 + 15 = 45

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