$($B$).$ An organization is granted the block $130\mathrm{.}34\mathrm{.}12\mathrm{.}64/26.$ The organization uses a router to subnet the block into four subnets.

$1-$ What is the number of addresses in the original block?

$2-$ What is the last address in the original block?

$3-$ What is the range of useable addresses in the original block?

$4-$ The CIDR notation after sub netting.

$5-$ The useable range of hosts IP addresses in each subnet.