The SUBSTRING_INDEX() function returns a substring of a string before a specified number of delimiter occurs.
mysql> SELECT ip, SUBSTRING_INDEX(ip,'.',1) AS part1,
SUBSTRING_INDEX(SUBSTRING_INDEX(ip,'.',2),'.',-1) AS part2, SUBSTRING_INDEX(SUBSTRING_INDEX(ip,'.',-2),'.',1) AS part3, SUBSTRING_INDEX(ip,'.',-1) AS part4 FROM log_file; +-----------------+-------+-------+-------+-------+ | ip | part1 | part2 | part3 | part4 | +-----------------+-------+-------+-------+-------+ | 127.0.0.1 | 127 | 0 | 0 | 1 | | 192.128.0.15 | 192 | 128 | 0 | 15 | | 255.255.255.255 | 255 | 255 | 255 | 255 | +-----------------+-------+-------+-------+-------+ 3 rows in set (0.00 sec)