How does switch differs from hub?

Given the following IP addresses $($In Hexadecimal$)$identify ;

a$)$ the Class,

b$)$ the Network ID $($both in hex and binary$),$

c$)$ the Host ID $($both in hex and binary$),$

d$)$ write each address in dotted decimal notation.

BC$145$F$3$A

$765E9A8D$

C$8483$F$95$

$5D3A297E$

$957B357E$

D$976827$B

$394E839A$

C$7562$DCF

$8CDFCB7A$

Exactly how many class A$,$ B$,$ and C networks can exist? Exactly how many hosts can a network in each class have? How many possible addresses are possible in each class? How many IP addresses are available overall?