Syntax:
INET_NTOA(expr)

Given a numeric IPv4 network address in network byte order, returns the
dotted-quad representation of the address as a string. INET_NTOA()
returns NULL if it does not understand its argument.

As of MySQL 5.5.3, the return value is a nonbinary string in the
connection character set. Before 5.5.3, the return value is a binary
string.

URL: http://dev.mysql.com/doc/refman/5.5/en/miscellaneous-functions.html

