GeoIP table join with table of IP's in MySQL

Question

I am having a issue finding a fast way of joining the tables looking like that:

mysql> explain geo_ip;
+--------------+------------------+------+-----+---         


        

Answer 1

Can't comment yet, but user1281376's answers is wrong and doesn't work. the reason you only use the first octet is because you aren't going to match all ip ranges otherwise. there's plenty of ranges that span multiple second octets which user1281376s changed query isn't going to match. And yes, this actually happens if you use the Maxmind GeoIp data.

with aleksis suggestion you can do a simple comparison on the fîrst octet, thus reducing the matching set.