Given a network address of $165\mathrm{.}100\mathrm{.}0\mathrm{.}0$ and a requirement for $1000$ subnets with $60$ usable hosts each, determine the followings $(35$ pts$)3.$

Address Class

b$.$Default subnet mask

c$.$ Custom subnet mask

d$.$ Total number of subnets.

e$.$ Total number of host addresses.

f$.$ Number of usable addresses.

g$.$ Number of bits borrowed questions