root@hostname:/var/www/racktables_beta# php test.php 
15	10.0.1.0/24
11	192.168.0.0/16
10	192.168.0.0/21
12	192.168.8.0/21
 * * * parent for 15 is 
     * net#15 is on the top
 * * * parent for 11 is 
     * net#11 is on the top
 * * * parent for 10 is 11
     * net#10 is on the top
     * net#11 is on the top
 * * * parent for 12 is 
10.0.1.0/24
192.168.0.0/16
  192.168.0.0/21
192.168.8.0/21
root@hostname:/var/www/racktables_beta#