16 bits
example class b:
nnn.nnn.0.0 - nnn.nnn.255.255
subnetmask: 255.255.0.0
example class c (8 bits):
nnn.nnn.nnn.0 - nnn.nnn.nnn.255
subnetmask: 255.255.255.0
exaple class a (24 bits):
nnn.0.0.0 - nnn.255.255.255
subnetmask: 255.0.0.0
The maximum number of host bits that can be borrowed from a class A address is 22 (technically you could borrow 23 but the resulting network would be useless). A class A address uses 8 bits for its network address and 24 bits for its host addresses. Class A uses a subnet mask of 255.0.0.0 You can only borrow 22 bits (instead of 24) because a valid network requires 4 addresses: A network address, two host addresses and a broadcast address. These networks would result in 30 bits used for the network address and 2 bits used for the host addresses. These networks use a subnet mask of 255.255.255.252
Thirty bits make up the network portion of a class C address. Three bits are borrowed for the subnet mask. There is also a class A and a class B that are comprised of bits.
14
In a Class A address, the default subnet mask is 255.0.0.0, allowing for a large number of hosts within a single network, but with 16 bits designated for the subnet ID, the subnet mask becomes 255.255.0.0. In contrast, a Class B address has a default subnet mask of 255.255.0.0, and with 8 bits for the subnet ID, the subnet mask would typically be 255.255.255.0. Thus, the key difference lies in the number of bits allocated for the subnet ID and the resulting subnet masks, affecting the number of available subnets and hosts per subnet.
class A
ATA/ATAPI-6
The offset for a Class C IP address is 24 bits.
3 bits
The number of bits used to identify the hosts is fixed by the class of the network. Up to 24 bits can make up the host portion of a Class C address.
255.255.255.0 - in decimal representation 11111111.11111111.11111111.00000000 - binary representation (3 bytes with all the bits equal to 1, the last byte with all the bits equal to 0) /24 - binary short representation (the number of bits equal to 1)
To determine the number of bits in the subnetted ID of 185.27.54.0, you need to know the subnet mask used. However, if it’s a standard Class B address (which uses a default mask of 255.255.0.0), it has 16 bits for the network portion. If the address is subnetted further, additional bits are borrowed from the host portion, increasing the network bit count. For example, if a subnet mask of 255.255.255.0 is used, then there would be 24 bits in the subnetted ID.
24 bits (8 bits per octet, so 3) are used for the network portion of a class C IP address