hi, can someone please help me out? i am having difficulty with this mask.can i subnet a class A address with 23 bits of subnetting? e.g. 10.20.0.0/23 is given to me and i need to subnet it to accomodate one subnet with 200 hosts, one subnet with 150 hosts, one subnet with 70 hosts and two subnets with 50 hosts each... i know i can use 10.20.0.0/24 to accomodate the first subnet with 200 hosts, what about the rest? thanks