15	10.0.1.0/24
11	192.168.0.0/16
10	192.168.0.0/21
12	192.168.8.0/21
strcmp = -8
192.168.0.0/16 - 192.168.8.0/21 = -8
 * * * parent for 15 is 
     * net#15 is on the top
strcmp = -182
10.0.1.0/24 - 192.168.0.0/16 = -182
 * * * parent for 11 is 
     * net#11 is on the top
strcmp = 0
ips are qeual, masks cmp = -1
192.168.0.0/16 - 192.168.0.0/21 = -2
 * * * parent for 10 is 11
     * net#10 is on the top
strcmp = -8
192.168.0.0/21 - 192.168.8.0/21 = -8
     * net#11 is on the top
strcmp = -8
192.168.0.0/16 - 192.168.8.0/21 = -8
 * * * parent for 12 is 
10.0.1.0/24
192.168.0.0/16
  192.168.0.0/21
192.168.8.0/21