CentOS - Sep 2010 - Maximum IP ranges

Hello,

Is there any maximum number of IP aliases or IP ranges that ifup can 
handle? Right now i have about 12000 IPs assigned to the server and when 
trying to assign range number 47 (ifup eth0-range47), i get his error:
/etc/sysconfig/network-scripts/ifup-post: line 21: 12733 Segmentation 
fault      /etc/sysconfig/network-scripts/ifup-aliases ${DEVICE} ${CONFIG}

Any advice is much appreciated.

Regards,
Radu