INET_ATON
Given the dotted-quad representation of an IPv4 network address as a string, returns an integer that represents the numeric value of the address in network byte order. INET_ATON() returns NULL if it does not understand its argument.
Syntax
INET_ATON(expr)
Example
SELECT INET_ATON('12.0.6.9')
The above example returns 201328137.