sabagay kung susundin lang ang problem na require only networks and not included the router ... well tama
lang ginawa mo CIDR /26. creating 4 subnets with 62 host very each subnet.
may isa ka nakalimutan para sa router ang mag assign ng isang subnet dahil flat network lang naman yan, kasi hindi rin magiging routable. sana ginawa mo /27 para meron ka 8 subnets.