[User:root Time:09:54:16 Path:/home/liangdong/php]$ php ip.php 
2406:6200:0000:0000:0000:0000:0000:0000[User:root Time:09:54:17 Path:/home/liangdong/php]$ cat ip.php 
<?php
$ipv6_start = "2406:6200::";
$ipv6_end = "240e:100::";

// 扩展ipv6格式方便阅读
$bin_start = inet_pton($ipv6_start);
$bin_end = inet_pton($ipv6_end);
$start = unpack('H*0', $bin_start)[0];
$start = str_split($start, 4);
$start = implode(":", $start);
echo $start;

/* 作为大数运算, 可以遍历start, end内所有IP地址
$start = gmp_init($start, 16);
$end = unpack('H*0', $bin_end)[0];
$end = gmp_init($end, 16);
echo gmp_strval($start, 16);
*/
?>

------解决方案--------------------
探讨


PHP code
[User:root Time:09:54:16 Path:/home/liangdong/php]$ php ip.php 
2406:6200:0000:0000:0000:0000:0000:0000[User:root Time:09:54:17 Path:/home/liangdong/php]$ cat ip.php 
<?php
$ipv6_start = "2……


------解决方案--------------------

2400:ff00::|32
应该是从
2400:ff00:0000:0000:0000:0000:0000:0000
-  
2400:ff00:0000:0000:0000:0000:ffff:ffff
后面的CIDR是位数, 32位就是ffff:ffff