An ISP is granted the block $80\mathrm{.}70\mathrm{.}56\mathrm{.}0/21.$ We know that just by looking at this you can find three things. Find the following $$

i$)$ Number of addresses supported $[3]$ ii$)$ First Address $[1]$ iii$)$ Last Address $[2]$

iv$)$ If you need for your organization, $2$ subnets, each supporting at$-$least $500$ addresses, find will the subnet mask of the $2$ subnets? $[4]$