Concept of classes in computer network

Question

You have a class B network with 12 bit subnets .How many subnets and how many hosts per subnet are available ?

Comments

I got the answer as 4096 subnets and 14 hosts but the given answer is 4094 subnets

Answer 1

Theoretically

class A:8 bits network id, 24 bits host id

and 2$^{8}$ networks are possible and 2$^{24}$ host/networks

class B: 16 bits network id, 16 bits for host id

and 2$^{16}$ networks are possible and 2$^{16}$ host/networks

class C:24 bits for network id,8 bits for host id

and 2$^{24}$ networks are possible and 2$^{8}$

Practically,

when we genarating ranges of ip's we use practical way

class A:2$^{7}$-2 networks are possible and 2$^{24}$-2 host/network

class B:2$^{14}$ networks are possible and 2$^{16}$-2 host/network

class C:2$^{21}$ networks are possible and 2$^{18}$-2 host/network

according to your question you  calculated it theoretically

so your answer is 4096

but practical method you get 4094

i.e you calculated as 2$^{12}$ it is theoretical method

practically 2$^{12}$-2 so answer is 4094