What is the last address of a block of classless addresses i

What is the last address of a block of classless addresses if one of the addresses is 110.10.2.55/30?
a) What is the Broadcast address?

b) What is the Last usable address?

Solution

110.10.2.55 is braod cast address:

because maximum subsets are -> 4

and maximum address is -> 2

0 0 1 1 0 1 0 0 and 0 0 1 1 0 1 1 1

so that 1 1 0 1 1 1 = 55 -> 110.10.2.55

and last usable address is - 110.10.2.54