FC6: Where is ip_conntrack_ftp being loaded from?

["Eric Wood" <eric@xxxxxxxxxxxxx>]

lsmod tells me that ip_conntrack_ftp is loaded but I want to understand how 
it got loaded.  It was not defined in these files:
/etc/sysconfig/iptables-config
/etc/rc.d/*
/etc/modprobe.conf

Is this particular module loaded by the kernel so some other special way?
thanks,
-eric wood