MySQL对IP地址进行排序
利用mysql自带内置函数：
INET_ATON(expr)
Given the dotted-quad representation of a network address as a string, returns an integer that represents the numeric value of the address. Addresses may be 4- or 8-byte addresses.
mysql> SELECT INET_ATON('209.207.224.40');
-> 3520061480
The generated number is always in network byte order. For the example just shown, the number is calculated as 209×2563 + 207×2562 + 224×256 + 40.
INET_ATON() also understands short-formIPaddresses:
mysql> SELECT INET_ATON('127.0.0.1'), INET_ATON('127.1');
-> 2130706433, 2130706433
Note: When storing values generated by INET_ATON(), it is recommended that you use an INT UNSIGNED column. If you use a (signed) INT column, values corresponding toIPaddresses for which the first octet is greater than 127 cannot be stored correctly. See Section 11.2, “Numeric Types”.
INET_NTOA(expr)
Given a numeric network address (4 or 8 byte), returns the dotted-quad representation of the address as a string.
mysql> SELECT INET_NTOA(3520061480);
-> '209.207.224.40'
以上是Mysql手册中的说明，实际使用方法：
我的ip是以字符串形式存储在表table_ip的ip_info字段中，可以用下面的查询语句返回以ip排序的结果
select ip_info from table_ip order by inet_aton(ip_info);
结果：
192.168.6.10
192.168.6.60
92.168.6.120
92.168.6.240
...
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